WO2007144958A1

WO2007144958A1 - Power amplifier control device, power amplifier control program, and power amplifier control method

Info

Publication number: WO2007144958A1
Application number: PCT/JP2006/312151
Authority: WO
Inventors: Hiroyuki Otsuki; Youji Suzuki; Shusaku Yoshida; Yoshiyuki Higuchi
Original assignee: Fujitsu Limited
Priority date: 2006-06-16
Filing date: 2006-06-16
Publication date: 2007-12-21

Abstract

A power amplifier control device controls an input voltage inputted to a power amplifier which amplifies power of a transmission signal according to a reception state of a base station. The device converts an output voltage of an output power detection unit for generating a voltage which has detected a part of the output power of the power amplifier into an output power. The device converts an output voltage of an input power detection unit generating a voltage which has detected a part of an input power of the power amplifier into an input power. The converted output power is subtracted by the calculated input power to obtain a gain of the power amplifier. A value obtained by subtracting a reference gain concerning the power amplifier from the calculated gain is used to control the input voltage to be inputted to the power amplifier. It should be noted that the power amplifier control device holds in advance, a function defined by an output voltage detected when outputting a predetermined output power according to the reference voltage and a predetermined output power and converts the output voltage of the power amplifier into an output power according to the function.

Description

Specification

Power amplifier control device, power amplifier control program, and power amplifier control method

Technical field

The present invention relates to a power amplifier control device, a power amplifier control program, and a power amplifier control method.

Background art

[0002] Conventionally, PDC (Personal Digital Cellular) and W—CDMA (Wideband Code)

In wireless communication such as the Division Multiple Access method, an electric wave of a certain frequency is generated and information is transmitted by an electric signal of a carrier wave (hereinafter referred to as “signal”) obtained by modulating the electric wave. For a wireless terminal that transmits and receives such a carrier wave signal, the power of the signal to be transmitted is amplified. Specifically, the reception status of the wireless terminal is determined on the base station side that transmits / receives a signal to / from the wireless terminal, and based on this determination, the output power related to amplification is predetermined from the base station to the wireless terminal. An instruction is issued to change the output power level, and the output power is changed on the wireless terminal side based on this instruction.

By the way, in amplifying the power of a signal to be transmitted, it is important to realize amplification that achieves both reduction of current consumption and distortion compensation. That is, for example, in a wireless terminal driven by a battery, the fact that the current consumption cannot be reduced means that the battery is consumed quickly. Therefore, it is important to reduce the current consumption, and the occurrence of distortion is caused by other mobile devices. Distortion compensation is important because it interferes with other communications and reduces the subscriber capacity of the system. Therefore, it is important to realize amplification that achieves both reduction of current consumption and distortion compensation. It becomes. For this reason, it is necessary to control the input voltage input to the power amplifier of the wireless terminal for the purpose of realizing amplification that achieves both reduction of current consumption and distortion compensation.

[0004] For example, in the method disclosed in Patent Document 1, as shown in FIG. 5, an input voltage (a power supply voltage value and a power supply voltage value) that is considered to be optimal is a viewpoint power for realizing amplification that achieves both reduction of current consumption and distortion compensation. The optimum value of (bias voltage value) is set to the output power level indicated by the base station. Is stored in advance by the wireless terminal, and when the base station instructs the wireless terminal to change to a predetermined output power level, the wireless terminal is associated with a predetermined output power level. The optimum power supply voltage value and bias voltage value are input to the power amplifier.

Patent Document 1: Japanese Patent Laid-Open No. 7-170202

Disclosure of the invention

Problems to be solved by the invention

[0006] Incidentally, the above-described conventional technique has a problem that it is not possible to simply control an input voltage that realizes an amplification that achieves both reduction of current consumption and distortion compensation. In other words, the optimal power supply voltage value and bias voltage value, which are considered to be optimal from the viewpoint of realizing amplification that achieves both reduction of current consumption and distortion compensation, are matched with the output power instructed by the base station. As a result, the storage area to be secured in the wireless terminal increases, and the optimum power supply voltage value and bias voltage value are adjusted and set for each wireless terminal. As a result, there is an increase in the time and labor required to ship the wireless terminal, which makes it difficult to simply control the input voltage to achieve amplification that achieves both reduction of current consumption and distortion compensation. is there. In particular, this issue becomes more conspicuous in W-C DMA wireless communication with 74 output power levels than wireless communication with PDC with 7 output power levels.

[0007] Therefore, the present invention has been made to solve the above-described problems of the prior art, and simply controls an input voltage that realizes amplification that achieves both reduction of current consumption and distortion compensation. An object of the present invention is to provide a power amplifier control device, a power amplifier control program, and a power amplifier control method that can be used.

Means for solving the problem

In order to solve the above-described problems and achieve the object, the invention according to claim 1 is an input power input to a power amplifier that amplifies the power of the transmission signal in accordance with the reception status of the base station. A power amplifier control device for controlling a pressure, wherein output power detecting means for generating a voltage obtained by detecting a part of the output of the power amplifier, and output power for converting the output voltage of the output power detecting means into output power Conversion means and a part of the input of the power amplifier were detected Input power detection means for generating a voltage, input power conversion means for converting the output voltage of the input power detection means into input power, and the input power conversion means from the output power converted by the output power conversion means Subtracting the input power converted by V to calculate the gain of the power amplifier, and calculating the input voltage to be input to the power amplifier based on a value obtained by subtracting the reference gain of the power amplifier from the gain. And an input voltage control means for controlling.

[0009] Further, in the invention according to claim 2, in the above invention, the output power conversion means detects the output of the output power detection means detected when outputting predetermined output power based on the reference voltage. A function determined by the voltage and the predetermined output power is held in advance, the output voltage of the output power detection means is converted into output power based on the function, and the input power conversion means is based on the function, The output voltage of the input power detection means is converted to input power.

[0010] Further, the invention according to claim 3 is characterized in that, in the above-mentioned invention, the input voltage control means controls a power supply voltage input to the power amplifier as the input voltage.

[0011] Further, the invention according to claim 4 is a power amplifier control that causes a computer to execute a method of controlling an input voltage input to a power amplifier that amplifies the power of a transmission signal according to a reception state of a base station. An output power detection procedure for generating a voltage obtained by detecting a part of the output of the power amplifier, an output power conversion procedure for converting an output voltage of the output power detection procedure into output power, and the power amplifier An input power detection procedure for generating a voltage obtained by detecting a part of the input of the input, an input power conversion procedure for converting the output voltage of the input power detection procedure into input power, and the output converted by the output power conversion procedure The gain of the power amplifier is calculated by subtracting the input power converted by the input power conversion procedure from the power, and the reference gain of the power amplifier is subtracted from the gain. And input voltage control step of controlling the input voltage to be input to the power amplifier based on a value obtained by subtracting, characterized by allowing a computer to execute the.

[0012] Further, the invention according to claim 5 is a power amplifier control method for controlling an input voltage input to a power amplifier that amplifies power of a transmission signal in accordance with a reception state of a base station. Therefore, an output power detection step for generating a voltage obtained by detecting a part of the output of the power amplifier, an output power conversion step for converting the output voltage of the output power detection step into output power, and an input of the power amplifier An input power detection step for generating a voltage detected from the input section; an input power conversion step for converting the output voltage of the input power detection step into input power; and the input from the output power converted by the output power conversion step. Subtracting the input power converted by the power conversion step to calculate the gain of the power amplifier, and the gain power is also input to the power amplifier based on a value obtained by subtracting the reference gain related to the power amplifier. And an input voltage control step for controlling the voltage.

The invention's effect

[0013] According to the invention of claim 1, 4 or 5, the power amplifier control device that controls the input voltage input to the power amplifier that amplifies the power of the transmission signal according to the reception status of the base station. The output voltage of the output power detection means is converted to output power, the output voltage of the input power detection means is converted to input power, and the converted input power is subtracted from the converted output power to gain the power amplifier. And the input voltage to be input to the power amplifier is controlled based on the value obtained by subtracting the reference gain of the gain power amplifier, so that the optimum value of the input voltage is held in advance (reduction of current consumption and distortion compensation). Ability to achieve amplification that achieves both the optimal power supply voltage value and bias voltage value, which are considered to be optimal, are held in advance by the wireless terminal in association with the output power instructed by the base station Compared to the above), there is no risk that the storage area to be secured in the wireless terminal will be increased in order to achieve both reduction of current consumption and distortion compensation, and there will be an increase in the effort to ship the wireless terminal. Because of these powers, it is possible to simply control the input voltage that realizes amplification that achieves both reduction of current consumption and distortion compensation. Furthermore, compared to the method of calculating from the reference voltage and converting it to input power, the value actually detected in the input power is used for conversion, so that the input voltage can be controlled with high accuracy and simplicity. .

[0014] According to the invention of claim 2, a function determined by the output voltage detected when the predetermined output power is output based on the reference voltage and the predetermined output power is held in advance, and based on this function Based on this function, convert the output voltage of the output power detection means to output power. Therefore, the output voltage of the input power detection means is converted to input power, so that variations in the components of the circuit that detects the output voltage are corrected, and the output voltage of the output power detection means is converted to output power. Then, the output voltage of the input power detection means is converted into the input power based on the function in which the variation is corrected, and from these, it becomes possible to control the input voltage more accurately and simply.

[0015] According to the invention of claim 3, since the power supply voltage input to the power amplifier is controlled as the input voltage, the circuit is compared with the method using the power supply voltage and the bias voltage as the input voltage to be controlled. As a result, the input voltage can be controlled more simply, and the power can be amplified more efficiently compared to the method using only the bias voltage as the input voltage to be controlled. Therefore, it is possible to control the input voltage effectively.

Brief Description of Drawings

FIG. 1 is a diagram for explaining the outline and features of a wireless terminal according to a first embodiment.

FIG. 2 is a diagram for explaining an output power conversion unit.

FIG. 3 is a diagram for explaining an input power conversion unit.

FIG. 4 is a flowchart showing a flow of input voltage control processing.

FIG. 5 is a diagram for explaining the prior art.

Explanation of symbols

[0017] 10 Transmitting and receiving antenna

20 Isolator

30 Power amplifier

40 Variable Gain Drive Amplifier

50 Reference voltage controller

60 Output power detector

70 Input power detector

80 Comparison part

100 Output power converter 200 Input power converter

300 Input voltage controller

310 Reference gain section

320 Gain calculator

330 Input voltage calculator

340 Variable voltage power supply

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of a power amplifier control device, a power amplifier control program, and a power amplifier control method according to the present invention will be described in detail with reference to the accompanying drawings. In the following, a radio terminal including the power amplifier control device according to the present invention will be described as an embodiment. In addition, the main terms used in the following examples, the outline and features of the wireless terminal in Example 1, the configuration of the wireless terminal in Example 1, the flow of input voltage control processing in Example 1, and the effects of Example 1 in order First, another embodiment will be described. Example 1

[0019] [Explanation of terms]

First, main terms used in the following examples will be described. The “wireless terminal” used in the following embodiments refers to a terminal that transmits and receives a carrier signal in wireless communication such as PDC (Personal Digital Cellular) system and W-CDMA (Wideband Code Division Multiple Access) system. is there. Such a wireless terminal amplifies the power of a signal to be transmitted (corresponding to the “transmission signal” recited in the claims) by a built-in power amplifier. That is, a “power amplifier” is a circuit that converts the power of an input transmission signal into a large output power and outputs it.

Here, amplification by the power amplifier is performed based on a reference voltage corresponding to the reception status of the base station. The “reception status” is a relative reception sensitivity state such as, for example, the intensity of carrier wave reception that varies due to movement of a wireless terminal or multipath. In the amplification by the power amplifier, first, the reception status of the wireless terminal is determined on the base station side that transmits / receives a signal to / from the wireless terminal, and based on this determination, the amplification is performed from the base station to the wireless terminal. An instruction is issued to change the output power to a predetermined output power level. And wireless On the terminal side, the reference voltage is changed based on this instruction, and the transmission signal is amplified based on the changed reference voltage. The level of the output power level at which the base station power instruction is issued differs depending on the wireless communication method, and is 7 steps for wireless communication using the PDC method and 74 steps for wireless communication using the W-CDMA method.

[0021] By the way, in amplifying the power of a transmission signal, it is important to realize amplification that achieves both reduction of current consumption and distortion compensation. For this purpose, the transmission signal is amplified based on a reference voltage. In addition, it is necessary to control the input voltage input to the power amplifier. In other words, the “power amplifier control device” used in the following embodiments refers to the input voltage input to the power amplifier of the wireless terminal for the purpose of realizing amplification that achieves both reduction of current consumption and distortion compensation. It is a device that controls.

[0022] [Overview and features of wireless terminal in embodiment 1]

Next, the outline and features of the wireless terminal according to the first embodiment will be described with reference to FIG. FIG. 1 is a diagram for explaining the outline and features of the wireless terminal according to the first embodiment.

[0023] A wireless terminal according to the first embodiment includes a power amplifier control device (an output power conversion unit 100, an input power conversion unit 200, and an input voltage control unit 300) according to the present invention. In addition, the power amplifier control apparatus according to the first embodiment is configured to control the input voltage input to the power amplifier that amplifies the power of the transmission signal according to the reception status of the base station. The main feature is to simply control the input voltage to achieve amplification that achieves both reduction and distortion compensation.

[0024] Briefly describing this main feature, as shown in FIG. 1, the radio terminal in the first embodiment uses a reference gain, which is a gain value that guarantees the performance of the power amplifier 30 in the first embodiment, as a reference. Store in advance in gain section 310. Although not shown, the radio terminal in the first embodiment uses the output voltage of the output power detection unit 60 detected when the power amplifier 30 outputs predetermined output power based on the reference voltage and the predetermined voltage. A function determined by the output power is stored in the output power conversion unit 100 in advance.

[0025] Here, the wireless terminal in the first embodiment performs control by the power amplifier control device, conversion of output power by the output power conversion unit 100, conversion of input power by the input power conversion unit 200, and input voltage control. It is assumed that the input voltage is controlled by unit 300 as needed. The Note that the timing of operations by the output power conversion unit 100, the input power conversion unit 200, and the input voltage control unit 300 in the present invention is not limited to the above case, and the output power level at which the base station power is also output. In response to the change instruction, the input power conversion unit 200 converts the input power, the output power conversion unit 100 converts the output power, and the input voltage control unit 300 converts the input voltage. It may be any when control is performed.

First, the conversion of output power will be described. The radio terminal in the first embodiment detects the output power of the power amplifier 30 in the output power detection unit 60 (see (1) in FIG. 1). Then, in the wireless terminal according to the first embodiment, the output power conversion unit 100 converts the output voltage of the output power detection unit 60 that generates a voltage obtained by detecting a part of the output power of the power amplifier 30 into the output power (FIG. (See 1 (2)). Here, the wireless terminal according to the first embodiment converts the output voltage of the output power detection unit 60 into output power based on a function stored in advance in the output power conversion unit 100.

[0027] Further, the conversion of input power will be described. The radio terminal in the first embodiment detects the input power of the power amplifier 30 in the input power detection unit 70 (see (3) in Fig. 1). Then, the wireless terminal according to the first embodiment converts the output voltage of the input power detection unit 70 that generates a voltage obtained by detecting a part of the input power of the power amplifier 30 into the input power in the input power conversion unit 200 (FIG. 1). (See (4)). Here, the wireless terminal according to the first embodiment converts the output voltage of the input power detection unit 70 into input power based on a function stored in advance in the output power conversion unit 100.

[0028] Further, the control of the input voltage will be described. First, the radio terminal according to the first embodiment uses the input power from the output power converted by the output power conversion unit 100 in the gain calculation unit 320 of the input voltage control unit 300. The gain of the power amplifier 30 is calculated by subtracting the input power converted by the power conversion unit 200 (see (5) in FIG. 1).

Next, the wireless terminal according to the first embodiment uses the power amplifier 30 stored in the reference gain unit 310 from the gain calculated by the gain calculation unit 320 in the input voltage calculation unit 330 of the input voltage control unit 300. The variable voltage power supply unit 340 controls the input voltage input to the power amplifier 30 based on the subtracted value (see (6) in FIG. 1). reference). That is, when the calculated gain is smaller than the reference gain, control is performed to increase the output power by Δν, and when the calculated gain is larger than the reference gain, control to decrease the output power by Δν is performed. In this case, the input voltage input to the power amplifier 30 is calculated, and the calculated input voltage is input to the power amplifier 30.

[0030] Because of this, the power amplifier control device according to the first embodiment can simply control the input voltage that realizes amplification that achieves both reduction in current consumption and distortion compensation.

[0031] [Configuration of wireless terminal in embodiment 1]

Next, the configuration of the wireless terminal according to the first embodiment will be described with reference to FIGS. FIG. 2 is a diagram for explaining the output power conversion unit, and FIG. 3 is a diagram for explaining the input power conversion unit.

First, as shown in FIG. 1, the radio terminal according to the first embodiment includes a transmission / reception antenna 10, an isolator 20, a power amplifier 30, a variable gain drive amplifier 40, a reference voltage control unit 50, and an output. The power detection unit 60, the input power detection unit 70, the comparison unit 80, the output power conversion unit 100, the input power conversion unit 200, and the input voltage control unit 300 are mainly configured. Note that the power amplifier control device according to the first embodiment refers to a portion configured by the output power conversion unit 100, the input power conversion unit 200, and the input voltage control unit 300.

[0033] The transmission / reception antenna 10 is means for transmitting and receiving signals to and from the base station. Specifically, as shown in FIG. 1, the transmission / reception antenna 10 is connected to the isolator 20, and transmits a signal received from the power amplifier 30 via the isolator 20 and the output power detection unit 60 to the base station. .

[0034] The isolator 20 is a means for protecting the wireless terminal by preventing signal wraparound. Specifically, as shown in FIG. 1, the isolator 20 is connected between the output power detection unit 60 and the transmission / reception antenna 10, and receives a signal received from the power amplifier 30 via the output power detection unit 60. Transmit to transmit / receive antenna 10.

[0035] The power amplifier 30 is means for amplifying the power of the transmission signal in the wireless terminal. Specifically, as shown in FIG. 1, the power amplifier 30 is connected between the input power detection unit 70 and the output power detection unit 60, and the variable gain drive amplifier 40 is connected via the input power detection unit 70. Or Then, the power of the transmission signal received is amplified and transmitted to the transmitting / receiving antenna 10 via the output power detector 60 and the isolator 20.

The variable gain drive amplifier 40 is means for amplifying a transmission signal to the power amplifier 30.

Specifically, as shown in FIG. 1, the variable gain drive amplifier 40 is connected between the comparison unit 80 and the input power detection unit 70, and amplifies the transmission signal based on the voltage received from the comparison unit 80. Then, it is transmitted to the power amplifier 30 via the input power detection unit 70.

The reference voltage control unit 50 is a means for outputting a reference voltage for controlling the gain of the variable gain drive amplifier 40. Specifically, as shown in FIG. 1, the reference voltage control unit 50 is connected to the comparison unit 80, and changes and outputs the reference voltage according to the output power level instructed from the base station.

Output power detection unit 60 is means for detecting the output power of power amplifier 30. Specifically, as shown in FIG. 1, the output power detection unit 60 is connected between the power amplifier 30 and the isolator 20, and generates an output voltage obtained by detecting a part of the output power of the power amplifier 30. Further, a voltage obtained by detecting a part of the detected output power of the power amplifier 30 is connected to the comparison unit 80 and the output power conversion unit 100, and is transmitted to the comparison unit 80 and the output power conversion unit 100. The output power detection unit 60 corresponds to “output power detection means” recited in the claims.

The input power detection unit 70 is means for detecting the input power of the power amplifier 30. Specifically, as shown in FIG. 1, the input power detection unit 70 is connected between the variable gain drive amplifier 40 and the power amplifier 30, and outputs an output obtained by detecting a part of the input power of the power amplifier 30. Generate voltage. In addition, a voltage obtained by detecting a part of the detected input power of the power amplifier 30 connected to the input power conversion unit 200 is transmitted to the input power conversion unit 200. The input power detection unit 70 corresponds to “input power detection means” described in the claims.

[0040] The comparison unit 80 is a means for correcting variation due to characteristics for each frequency. Specifically, as shown in FIG. 1, the comparison unit 80 is connected between the reference voltage control unit 50 and the variable gain drive amplifier 40, and receives the input of the reference voltage output from the reference voltage control unit 50. . Further, it is connected to the output power detection unit 60, and receives an input of a voltage obtained by detecting a part of the output power of the power amplifier 30 detected by the output power detection unit 60. The comparison unit 80 The reference voltage that received the force is compared with the output voltage, the voltage is changed until a predetermined convergence value is reached, and the variable gain drive amplifier 40 is controlled.

Output power conversion unit 100 is means for converting the output voltage of output power detection unit 60 into the output power of power amplifier 30. Specifically, as shown in FIG. 1, the output power conversion unit 100 is connected to the output power detection unit 60 and the gain calculation unit 320, and the output power conversion unit 100 detects the power amplifier 30 detected by the output power detection unit 60. A voltage obtained by detecting a part of the output power is converted into output power, and the converted output power of the power amplifier 30 is transmitted to the gain calculation unit 320. Here, the output power conversion unit 100 in the first embodiment uses the output voltage detected when outputting the predetermined output power to the power amplifier 30 based on the reference voltage and the predetermined output power. A fixed function is held in advance, and the output voltage of the output power detector 60 is converted into output power based on this function. For example, since the relationship between the output voltage and the output power of the output power detection unit 60 is represented by an exponential function as shown in FIG. 2, the output power conversion unit 100 is a power amplifier detected by the output power detection unit 60. A voltage obtained by detecting a part of the output power of 30 is plotted on this exponential function and converted to output power. The output power conversion unit 100 corresponds to the “output power conversion means” described in the scope of patent request.

The input power conversion unit 200 is a means for converting the output voltage of the input power detection unit 70 into input power. Specifically, as shown in FIG. 1, the input power conversion unit 200 is connected to the input power detection unit 70 and the gain calculation unit 320, and is input to the power amplifier 30 detected by the input power detection unit 70. A voltage obtained by detecting a part of the power is converted into input power, and the converted input power of the power amplifier 30 is transmitted to the gain calculation unit 320. Here, the input power conversion unit 200 in the first embodiment converts the input power of the power amplifier 30 based on a function stored in advance in the output power conversion unit 100. For example, since the relationship between the output voltage of the input power detection unit 70 and the input power is represented by an exponential function as shown in FIG. 3, the input power conversion unit 200 includes the power amplifier detected by the input power detection unit 70. A voltage obtained by detecting a part of the 30 input power is plotted on this exponential function and converted to input power. The input power conversion unit 200 corresponds to “input power conversion means” described in the claims.

[0043] The input voltage control unit 300 subtracts the input power converted by the input power conversion unit 200 from the output power converted by the output power conversion unit 100 and uses the power amplifier 30. Is a means for controlling the input voltage input to the power amplifier 30 based on the value obtained by subtracting the reference gain related to the power amplifier 30, and particularly as closely related to the present invention, As shown in FIG. 1, a reference gain unit 310, a gain calculation unit 320, an input voltage calculation unit 330, and a variable voltage power supply unit 340 are provided. The input voltage control unit 300 corresponds to “input voltage control means” recited in the claims.

Reference gain section 310 is means for storing in advance a reference gain that is a gain value that guarantees the performance of power amplifier 30. Specifically, as shown in FIG. 1, reference gain section 310 is connected to input voltage calculation section 330, and transmits a reference gain stored in advance to input voltage calculation section 330.

The gain calculation unit 320 is a means for calculating the gain of the power amplifier 30 by subtracting the input power from the output power of the power amplifier 30. Specifically, as shown in FIG. 1, gain calculation section 320 is connected to output power conversion section 100 and input power conversion section 200, and from the output power of power amplifier 30 converted by output power conversion section 100, Then, the gain of the power amplifier 30 is calculated by subtracting the input power of the power amplifier 30 converted by the input power conversion unit 200. Gain calculation section 320 is connected to input voltage calculation section 330 and transmits the calculated gain of power amplifier 30 to input voltage calculation section 330.

The input voltage calculation unit 330 is a means for calculating an input voltage input to the power amplifier 30 based on a value obtained by subtracting a reference gain related to the power amplifier 30 from the gain force. Specifically, as shown in FIG. 1, the input voltage calculation unit 330 is connected to the reference gain unit 310 and the gain calculation unit 320, and from the gain of the power amplifier 30 calculated by the gain calculation unit 320, the reference gain is calculated. The reference gain related to the power amplifier 30 stored in advance by the obtaining unit 310 is subtracted, and the input voltage input to the power amplifier 30 is calculated based on the subtracted value. Here, the input voltage calculation unit 330 in the first embodiment controls the power supply voltage input to the power amplifier 30 as the input voltage. For example, when the gain of the calculated power amplifier 30 is smaller than the reference gain, the input voltage calculation unit 330 performs control to increase the output power by Δν, and the calculated gain of the power amplifier 30 is higher than the reference gain. If it is larger, control is performed to lower the output power by Δν, and in each case, the power supply voltage input to the power amplifier 30 is calculated. The input voltage calculation unit 330 is connected to the variable voltage power supply unit 340, and the calculated input voltage is variable. Transmit to voltage power supply unit 340.

The variable voltage power supply unit 340 is a means for inputting an input voltage to the power amplifier 30. Specifically, as shown in FIG. 1, the variable voltage power supply unit 340 is connected to the input voltage calculation unit 330 and the power amplifier 30, and the input voltage calculated by the input voltage calculation unit 330 is increased. Input to width 30. Here, since the variable voltage power supply unit 340 in the first embodiment controls the power supply voltage input to the power amplifier 30 as the input voltage, the power supply voltage calculated by the input voltage calculation unit 330 is used as the power amplifier 30. To enter.

[Flow of input voltage control processing in embodiment 1]

Next, the flow of the input voltage control process in the first embodiment will be described with reference to FIG. FIG. 4 is a flowchart showing the flow of the input voltage control process.

First, in the gain calculation unit 320, the radio terminal inputs the output power of the power amplifier 30 converted by the output power conversion unit 100 and the input power of the power amplifier 30 converted by the input power conversion unit 200. When the input is accepted (Yes at step S401), the wireless terminal obtains the input power from the output power accepted by the gain calculation unit 320. By subtracting, the gain of the power amplifier 30 is calculated (step S402). If the input is not accepted (No at Step S401), the wireless terminal returns to the process of waiting for the input of the output power and the input power in the gain calculation unit 320 (Step S401).

[0050] Subsequently, in the input voltage calculation unit 330, the radio terminal subtracts the reference gain stored in advance by the reference gain unit 310 from the gain power calculated by the gain calculation unit 320, based on the subtracted value. The input voltage input to the power amplifier 30 is calculated (step S40 3).

[0051] Then, in the variable voltage power supply unit 340, the radio terminal inputs the input voltage calculated by the input voltage calculation unit 330 to the power amplifier 30 (step S404).

[0052] [Effect of Example 1]

As described above, according to the first embodiment, the power amplifier control device that controls the input voltage input to the power amplifier that amplifies the power of the transmission signal according to the reception status of the base station, Converts the output voltage of the output power detection means to output power, and detects input power Based on the value obtained by subtracting the converted output power from the converted output power and calculating the gain of the power amplifier, and subtracting the reference gain for the power amplifier from the converted output power. The input voltage input to the power amplifier is controlled by this method, so that the optimum value of the input voltage is maintained in advance (the power to achieve amplification that achieves both current consumption reduction and distortion compensation) Compared with the method in which the wireless terminal holds the optimum value of the bias voltage value in advance by associating it with the output power instructed from the base station), the wireless terminal can achieve both reduction of current consumption and distortion compensation. In addition, there is no risk of increasing the storage area to be secured, and there is no risk of increasing the time until the wireless terminal is shipped. Input voltage to achieve the amplification it is possible to simplify control of that. Furthermore, compared to the method of calculating the reference voltage force and converting it to the input power, the value actually detected in the input power is used for conversion, so that the input voltage can be controlled with high accuracy and simplicity.

Further, according to the first embodiment, a function determined by the output voltage detected when the predetermined output power is output based on the reference voltage and the predetermined output power is held in advance, and the function is based on this function. The output voltage of the output power detection means is converted to output power, and the output voltage of the input power detection means is converted to input power based on this function, so variations in circuit components that detect the output voltage are corrected. Then, the output voltage of the output power detection means is converted into the output power, and the output voltage of the input power detection means is converted into the input power based on the function whose variation is corrected. It is possible to control more accurately and simply.

[0054] According to the first embodiment, since the power supply voltage input to the power amplifier is controlled as the input voltage, the circuit is simpler than the method using the power supply voltage and the bias voltage as the input voltage to be controlled. Therefore, the input voltage can be controlled more simply, and moreover, the power can be amplified more efficiently than the method using only the bias voltage as the input voltage to be controlled. Can be effectively controlled. Example 2

By the way, the power described for the wireless terminal in the first embodiment so far The present invention may be implemented in various different forms other than the first embodiment described above. Therefore, Hereinafter, different embodiments will be described as the wireless terminal in the second embodiment.

[0056] [Other Examples]

In the first embodiment, the output power conversion unit 100 holds in advance a function determined by the output voltage detected when the power amplifier 30 outputs the predetermined output power and the predetermined output power, and is based on this function. The case where the output voltage of the output power detector 60 is converted into the output power has been described, but the present invention is not limited to this, for example, it is determined by an average value as a component of the circuit that detects the output power. The function can be stored in advance and converted based on this function. The conversion method is!

In the first embodiment, the case where only the power supply voltage is controlled as the input voltage controlled by the input voltage control unit 300 has been described. However, the present invention is not limited to this. The present invention can be similarly applied to the case of controlling only the voltage or the case of controlling both the power supply voltage and the bias voltage.

In the first embodiment, the case where the amplifier built in the wireless terminal includes not only the power amplifier 30 but also the variable gain drive amplifier 40 has been described. However, the present invention is not limited to this. Similarly, the present invention can be applied to a case where the power amplifier 30 is composed of only the power amplifier 30 that is not provided.

[0059] [System configuration, etc.]

In addition, among the processes described in the above embodiments, all or part of the processes described as being performed automatically can be performed manually, or the processes described as being performed manually. All or a part of the above can be automatically performed by a known method. In addition, the processing procedures, control procedures, specific names, and information including various types of data and parameters shown in the above documents and drawings can be arbitrarily changed unless otherwise specified.

[0060] Each component of the illustrated wireless terminal is functionally conceptual and does not necessarily need to be physically configured as illustrated. In other words, the specific form of distribution / integration of each device is not limited to the one shown in the figure, and all or a part thereof is functionally or physically distributed in an arbitrary unit according to various loads and usage conditions. · Can be integrated and configured. Furthermore, each processing function performed in each device can be performed in whole or in any part. It can be realized by a program that is analyzed and executed by the PU and the CPU, or it can be realized as hardware by wired logic.

It should be noted that the power amplifier control method described in the first embodiment can be realized by executing a prepared program on a computer such as a personal computer or a workstation. This program can be distributed over networks such as the Internet. This program is recorded on a computer-readable recording medium such as a hard disk, flexible disk (FD), CD-ROM, MO, DVD, etc., and is executed by being read out by the computer.

Industrial applicability

As described above, the power amplifier control device, the power amplifier control program, and the power amplifier control method according to the present invention are input to the power amplifier that amplifies the power of the transmission signal according to the reception status of the base station. It is useful for controlling the input voltage, and is particularly suitable for simply controlling the input voltage that achieves amplification that achieves both reduction in current consumption and distortion compensation.

Claims

The scope of the claims

[1] A power amplifier control device that controls an input voltage input to a power amplifier that amplifies the power of a transmission signal according to a reception situation of a base station,

Output power detection means for generating a voltage obtained by detecting a part of the output of the power amplifier; output power conversion means for converting the output voltage of the output power detection means into output power; and a part of the input of the power amplifier. Input power detecting means for generating a detected voltage; input power converting means for converting the output voltage of the input power detecting means into input power; and the input power converting means from the output power converted by the output power converting means. An input voltage for controlling the input voltage to be input to the power amplifier based on a value obtained by subtracting the reference power related to the power amplifier. Control means;

A power amplifier control apparatus comprising:

[2] The output power conversion means holds in advance a function determined by the output voltage of the output power detection means detected when the predetermined output power is output based on the reference voltage and the predetermined output power. And converting the output voltage of the output power detection means into output power based on the function,

2. The power amplifier control device according to claim 1, wherein the input power conversion means converts an output voltage of the input power detection means into input power based on the function.

3. The power amplifier control device according to claim 1 or 2, wherein the input voltage control means controls a power supply voltage input to the power amplifier as the input voltage.

[4] A power amplifier control program that causes a computer to execute a method of controlling an input voltage input to a power amplifier that amplifies the power of a transmission signal according to a reception situation of a base station,

An output power detection procedure for generating a voltage obtained by detecting a part of the output of the power amplifier; an output power conversion procedure for converting the output voltage of the output power detection procedure into an output power; and a part of the input of the power amplifier. An input power detection procedure for generating a detected voltage; an input power conversion procedure for converting an output voltage of the input power detection procedure into input power; The gain of the power amplifier is calculated by subtracting the input power converted by the input power conversion procedure from the output power converted by the output power conversion procedure, and the gain power is subtracted from the reference gain associated with the power amplifier. An input voltage control procedure for controlling the input voltage input to the power amplifier based on a value;

A computer-executable power amplifier control program.

A power amplifier control method for controlling an input voltage input to a power amplifier that amplifies the power of a transmission signal according to a reception situation of a base station,

An output power detection step of generating a voltage obtained by detecting a part of the output of the power amplifier; an output power conversion step of converting the output voltage of the output power detection step into output power; and a part of the input of the power amplifier. An input power detection step for generating a detected voltage, an input power conversion step for converting the output voltage of the input power detection step into input power, and the input power conversion step from the output power converted by the output power conversion step An input voltage for controlling the input voltage to be input to the power amplifier based on a value obtained by subtracting the reference power related to the power amplifier. Control process;

A power amplifier control method comprising: