JP2000049552A - Transmission output controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify two adjusting processes which are needed for setting that is for adjusting variable voltage to be added to control voltage that is given to a variable amplifier and the setting of reference value that gives reference value with which the value at which an output level is detected is compared, as one adjusting process. SOLUTION: This controller measures an output while operating a variable voltage controller 12 that adjusts the output of an adder 11 which is given to a variable amplifier 4 at the time of an adjustment mode, stores the output of a detection circuit 6 at that time as reference value in a storage circuit 7 at the time of adjusting it to regulated output level and performs automatic output level control with the value of the circuit 7 as reference value in an operation mode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission output control device for controlling a transmission output level of a radio. The present invention relates to a control device that automatically controls a wireless output of a mobile device or the like to a predetermined transmission output level based on a set reference value.

[0002]

2. Description of the Related Art Automatic output level adjusting circuit (APC circuit)
There is a wireless device that automatically controls the transmission output level output from the antenna, and one example of this configuration is shown in FIG.

[0003] A wireless device includes an antenna 1 and this antenna 1
An output amplifier 3 that gives an amplified output level, a variable amplifier 4 whose amplification amount is controlled by a given control voltage signal, and an output thereof is given to the output amplifier, and a transmission signal modulated by the variable amplifier 4 Providing a modulator 5 for providing
As a control loop for controlling the transmission output level, a detection circuit 6 for detecting the output of the output amplifier 3, a variable voltage controller (volley in this example) 13 for providing a reference level, an output of the detection circuit 6, and a variable voltage controller The comparator 8 compares the reference value provided by the comparator 13, an up-down counter 9 whose value increases or decreases according to the output of the comparator 8, and converts the output of the up-down counter 9 into an analog voltage signal. A D / A converter 10, an adder 11 to which the output of the D / A converter is provided, and a voltage signal applied to the adder 11 in a mode for adjusting the output level of the adder and the output level of the radio. A variable voltage controller (in this example, a variable resistor that can vary the output voltage) 12.

A description will be given of an adjustment operation in a transmission output level adjustment mode in the wireless device.

In the adjustment mode, the output voltage of the variable voltage controller 12 and the output voltage obtained by converting the digital output of the initial setting value of the up / down counter 9 into an analog voltage by the D / A converter 10 are added by the adder 11. The amplification amount of the variable amplifier 4 is varied by the control voltage signal thus obtained.
While measuring the transmission output level with the measuring device 2 outside the wireless device,
The variable voltage controller 12 is operated to adjust to a specified transmission output level. The output of the up / down counter 9 at this time is fixed to an arbitrary initial adjustment value in the adjustment mode by the mode switching signal. When the transmission output level from the antenna can be adjusted to the specified transmission output level, the adjustment is terminated.

Next, the mode is switched from the adjustment mode to the operation mode. The comparator 8 compares the detection voltage of the detection circuit 6 with the output voltage of the variable voltage controller 13, and the current transmission output level is a reference provided by the variable voltage controller 13. Compare high or low against the value. As a result of the comparison, when the value is higher than the reference value, the up / down counter 9 varies its digital output value so as to reduce the amplification amount of the variable amplifier 4, and when the value is lower than the reference value, increases the amplification amount of the variable amplifier 4 so that the amplification amount increases. The digital output value is changed, converted into an analog voltage value by the D / A converter 10, and the voltage is output to the adder 11. In such a state, the variable voltage controller 13 is operated to adjust the transmission output level to a specified level while measuring with the measuring device 2 outside the wireless device.

After the adjustment, even if the gain or loss of each circuit after the modulator 5 changes due to a change in temperature or the like, the transmission output level of the antenna 1 can maintain the specified transmission output level.

[0008]

As described above, the adjustment of the conventional automatic transmission output level adjustment circuit requires two adjustments by operating two variable voltage controllers. Since the number of man-hours for adjustment at the time is increased and adjustment by humans is required, there is a problem that reliability is lowered.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a transmission output level control device which can adjust the transmission output level of a wireless device at one time and has improved reliability.

[0010]

According to the present invention, there is provided a variable amplifier whose gain is varied by a control signal, detecting means for detecting an amplified output level, and comparing the output of the detecting means with a preset reference value. In a transmission output level control device including a comparison unit and a control signal generation unit that outputs the control signal according to an output of the comparison unit, when a transmission level measured in a level adjustment mode becomes a prescribed level The output of the detection means is stored as a reference value,
There is provided storage means for giving the stored value to the comparing means as a reference value in the operation mode.

The control signal generating means includes an up / down counter whose value is increased / decreased in accordance with the output of the comparing means, a D / A converter for converting the value of the up / down counter into an analog voltage signal, A variable voltage control unit that supplies an analog voltage signal in a mode; and an adder that adds an output signal of the D / A converter and an output analog voltage signal of the variable voltage control unit and supplies the same as a control signal to the variable amplifier. Is preferred.

The transmission output level control device of the radio is switched between the adjustment mode and the operation mode. In the adjustment mode, a control voltage signal, which is a control signal, is supplied to the variable amplifier while operating the variable voltage controller so that the transmission output level becomes a specified value, and the measurement is performed by a measuring device outside the wireless device. . This transmission output level is detected by a detection means for detecting the output level of the amplifier, and when the measurement result of the measuring instrument reaches a prescribed transmission output level, the output value of the detection circuit is stored in the storage circuit as a reference value. Let it.

In the operation mode, the value of the output level of the output amplifier detected by the detecting means is compared with the reference value stored in the storage circuit. The output value of the up / down counter is varied according to the magnitude of the comparison result, and the output value of the up / down counter is converted into an analog voltage signal, which is provided as a control voltage signal of the variable amplifier, and automatically controls the transmission output level. .

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a configuration of an example of a transmission output control device of a radio device according to an embodiment of the present invention.

That is, in the radio device of this embodiment, the antenna 1, the output amplifier 3 for giving an amplified output level to the antenna 1, and the amount of amplification are controlled by a given control voltage signal. And a detection circuit 6 for detecting the output of the output amplifier 3 as a control loop for controlling the transmission output level, comprising: A storage circuit 7 for storing the output of the detection circuit 6 as a reference value when a reference value storage signal is input from the outside, and a comparator 8 for comparing the output of the detection circuit 6 with the reference value provided by the storage circuit 7. And an up-down counter 9 whose value increases or decreases according to the output of the comparator 8, and a D / A converter that converts the output of the up-down counter 9 into an analog voltage signal. An inverter 10, an adder 11 to which the output of the D / A converter is provided and for providing the output to the variable amplifier 4 as a control voltage signal, and a voltage signal to the adder 11 in a mode for adjusting the transmission output level of the radio. (In this example, a volume that can adjust the voltage provided by the variable resistor) 12.

The present invention, when compared with the configuration of the prior art shown in FIG. 2, uses the output of the detection circuit 6 as a reference value when a reference value storage signal is input when a specified transmission output level is reached in the adjustment mode. A storage circuit 7 for storing the data is provided. In the operation mode, the reference value stored in the storage circuit is given to the comparator 8 as a reference value.

The configurations of the detection circuit 6, the comparator 8, the up / down counter 9, and the D / A converter 10 are described in, for example, paragraph 001 of JP-A-8-316756.
2, the up / down counter 9 subtracts the digital value output when the output of the comparator 8 is “1” (when the detection output is larger than the reference value),
Is "0" (when the detection output is smaller than the reference value), the digital value to be output is added.

The operation of the wireless device in the adjustment mode and the operation mode will be described.

A modulation signal output from a modulator 5 for generating a modulation signal of a transmission signal is amplified by a variable amplifier 4 whose amplification amount can be varied by a control voltage signal, and is input to an output amplifier 3. The output amplifier 3 amplifies the input signal and emits a radio wave by the antenna 1. At this time, the variable voltage controller 12 is operated, and the output voltage thereof is added to the output voltage of the D / A converter 10 by the adder 11, and the amplification amount of the variable amplifier 4 is varied by the added control voltage signal. The output of the antenna 1 is measured by the measuring device 2 outside the wireless device, and the variable voltage controller 12 is adjusted so as to have a specified transmission output level. At this time, the up / down counter 9 is in the adjustment mode by the input mode switching signal, and the output value is fixed to an arbitrary initial adjustment value. When the transmission output level of the antenna 1 can be adjusted to the prescribed transmission output level, the reference value storage signal is input to the storage circuit 7, and the storage circuit 7 detects the output of the output amplifier 3 by the detection value detected by the detection circuit 6. Is stored as the reference value, and the output level adjustment ends.

After the adjustment is completed, a mode switching signal is input,
The up / down counter 9 switches to the operation mode. The comparator 8 compares the detection value of the detection circuit 6 to which the output of the output amplifier is input with the reference value stored in the storage circuit 7 to determine whether the current output level is higher or lower than a specified value. Then, the output is input to the up / down counter 9.
If the current output level is higher than the specified value, the up / down counter 9 lowers the digital output value so that the amplification amount of the variable amplifier 4 becomes smaller, so that the D / A converter 10
, The control voltage signal supplied to the variable amplifier 4 decreases, and the amount of amplification decreases. When the output of the comparison circuit indicates that the output is low, the digital output value of the up-down counter 9 increases so that the amplification amount of the variable amplifier 4 increases. As a result, the output voltage of the D / A converter 10 increases, and the amount of amplification of the control voltage signal applied to the variable amplifier 4 by the variable amplifier 4 increases.

By automatically controlling the transmission output level (radiation level) of the antenna 1 in this manner, even if the temperature or the like changes or the gain or loss of each circuit after the modulator 5 changes, the antenna 1 does not change. Can maintain a specified transmission output level.

The storage circuit 7 is preferably a non-volatile storage circuit, and may be an EEPROM, an SRAM, a flash memory, or the like. Also,
When the storage circuit is a digital storage circuit and the output of the detection circuit is an analog output, the storage circuit includes an A / D converter and a D / A converter.
A / D converter is provided between the detection circuit and the storage circuit, and a D / A converter is provided between the / D converter and the comparator. If the output of the detection circuit is a digital output and the comparator is a digital signal comparator, the A / D
No converter or D / A converter is required.

[0024]

As described above, according to the present invention, the adjustment of the transmission output level of the radio device can be performed only once, and it is no longer necessary to adjust the transmission output level twice as in the prior art. Can be. Further, the number of manual adjustment steps is reduced, so that reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna 2 Measuring instrument 3 Output amplifier 4 Variable amplifier 5 Modulator 6 Detection circuit 7 Storage circuit 8 Comparator 9 Up / down counter 10 D / A converter 11 Adder 12, 13 Variable voltage controller

Claims (2)

[Claims] A variable amplifier whose gain is varied by a control signal; a detecting means for detecting an amplified output level; a comparing means for comparing an output of the detecting means with a preset reference value; And a control signal generating means for outputting the control signal in accordance with an output, wherein a transmission output level measured in a level adjustment mode is a reference level when the transmission output level measured in the level adjustment mode becomes a specified level. A transmission output control device, comprising: a storage unit that stores the stored value as a reference value in the operation mode as a reference value to the comparison unit. 2. A control signal generating means comprising: an up / down counter whose value increases / decreases in accordance with an output of the comparing means; a D / A converter which converts the value of the up / down counter into an analog voltage signal; A variable voltage control means for supplying an analog voltage signal in a mode,
2. The transmission output control device according to claim 1, further comprising: an adder for adding an output signal of the A converter and an analog voltage signal output from the variable voltage control means, and providing the added signal as a control signal to the variable amplifier.