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KR20130065485A - Reveiver with lna and input signal processing method thereof - Google Patents

Reveiver with lna and input signal processing method thereof Download PDF

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Publication number
KR20130065485A
KR20130065485A KR1020110132364A KR20110132364A KR20130065485A KR 20130065485 A KR20130065485 A KR 20130065485A KR 1020110132364 A KR1020110132364 A KR 1020110132364A KR 20110132364 A KR20110132364 A KR 20110132364A KR 20130065485 A KR20130065485 A KR 20130065485A
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KR
South Korea
Prior art keywords
signal
low noise
activated
amplification level
gain control
Prior art date
Application number
KR1020110132364A
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Korean (ko)
Inventor
최경문
Original Assignee
엘지이노텍 주식회사
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Application filed by 엘지이노텍 주식회사 filed Critical 엘지이노텍 주식회사
Priority to KR1020110132364A priority Critical patent/KR20130065485A/en
Publication of KR20130065485A publication Critical patent/KR20130065485A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/52—Automatic gain control
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/294—Indexing scheme relating to amplifiers the amplifier being a low noise amplifier [LNA]

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

PURPOSE: A receiving device including an LNA(Low Noise Amplifier) circuit and an input signal processing method are provided to amplify an RF(Radio Frequency) signal as variable gains, thereby implementing the LNA circuit which is applied to a lot of field environment. CONSTITUTION: First to N-th LNAs(121) amplify RF signals inputted from the outside. First to N-th switches(122) control operations of the first to N-th LNAs. A switch control unit(125) determines an activated LNA corresponding to an AGC(Auto Gain Control) signal inputted from the outside. The switch control unit outputs a control signal for activation of the determined LNA to a corresponding switch. The number of activated LNAs is changed corresponding to the AGC signal. [Reference numerals] (122) First to N-th switches; (123) Path switch; (124) Composition unit; (125) Switch control unit

Description

A receiver including a low noise amplification circuit and an input signal processing method thereof

The present invention relates to a receiving apparatus including a low noise amplifying circuit and an input signal processing method thereof.

With the development of wireless communication technology, various wireless electronic devices have been developed and widely used. In a wireless communication system, there is a transmitter for transmitting a radio signal, and there is a receiver for receiving a radio signal. The transmitter generates and transmits a radio signal through a demodulation process of combining a data signal with a high frequency wave. The receiving apparatus receives a radio signal, modulates a desired data signal through a modulation process, and uses the same internally.

In the case of television, in general, television stations transmit radio waves of ultra high frequency (VHF) and ultra high frequency (UHF) to viewers. Recently, in urban areas, the signals provided by broadcasting stations are not properly received by television terminals, which are well-received devices, due to noise signals frequently generated by traffic congestion and increase in high-rise buildings such as aircraft, automobiles, high-speed railways and trains. It is happening.

In order to solve this problem, recently, a wireless signal receiver in a television terminal includes a function of removing and amplifying a case where there is a lot of noise in an input signal.

1 is a view showing a low noise amplifier (LNA) according to the prior art. This represents the LNA in the RF signal processing circuit disclosed in the prior document (2009-0104381).

Referring to FIG. 1, the LNA circuit includes an input filter unit 10, a low noise amplifier 20, and a switch 30.

The input filter unit 10 transmits a signal of a desired band among the RF signals input through the antenna.

The low noise amplifier 20 reduces noise and amplifies the signal for the RF signal transmitted through the input filter unit 10.

The switch 30 determines whether to output the signal passing through the input filter unit 10 through the path including the low noise amplifier 20 or the path without the low noise amplifier 20. .

According to the above LNA circuit, it is simply determined whether to amplify or bypass the RF signal to a fixed level.

However, since the LNA circuit according to the prior art always amplifies the RF signal to a fixed level, there is a problem in reducing the sensitivity or reception performance for the RF signal having a certain level.

According to an embodiment of the present invention, there is provided a receiver having a low noise amplifier capable of amplifying and outputting the RF signal at a variable level according to an automatic gain control signal of an input RF signal and an input signal processing method thereof. .

Technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned above are clearly understood by those skilled in the art to which the embodiments proposed from the following description belong. Could be.

According to an embodiment of the present invention, a receiver includes: first to N low noise amplifiers for amplifying an RF signal input from an external device; First to N switches for controlling the operation of the first to N low noise amplifiers; And a switch controller configured to determine a low noise amplifier to be activated according to an automatic gain control signal input from an external device, and output a control signal to a corresponding switch so that the determined low noise amplifier is activated. The gain control signal is changed.

In addition, the input signal processing method of the receiving apparatus according to an embodiment of the present invention includes the steps of receiving an automatic gain control signal input from the outside; Determining a low noise amplifier to be activated among a plurality of low noise amplifiers using the received automatic gain control signal; And amplifying an RF signal input from the outside using the determined low noise amplifier, wherein the number of activated low noise amplifiers is changed according to the automatic gain control signal.

According to an embodiment of the present invention, by amplifying an RF signal with a variable gain, an LNA circuit applicable to various field environments may be implemented. In addition, according to an embodiment of the present invention, by deactivating the LNA circuit in accordance with the field environment, it is possible to monitor in advance the situation where the reception sensitivity and reception performance is reduced due to the amplification of the strong electric field signal, and the power consumption is reduced. Can be reduced.

1 is a view showing a low noise amplifier (LNA) according to the prior art.
2 is a diagram illustrating a configuration of a receiver according to an embodiment of the present invention.
3 is a detailed block diagram showing the LNA of FIG.
4 is a flowchart illustrating a step-by-step method of processing an input signal of a receiving apparatus according to an exemplary embodiment of the present invention.

DETAILED DESCRIPTION Embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.

2 is a diagram illustrating a configuration of a receiving apparatus 100 according to an embodiment of the present invention.

Referring to FIG. 2, the receiver 100 includes an input filter unit 110, a low noise amplifier (LNA) 120, a first tuning circuit 130, an RF amplifier 140, and a second tuning circuit 150. ), A signal selector 160, and a demodulator 170.

The input filter unit 110 transmits a signal of a desired band among the RF signals input through the antenna.

The LNA 120 is a circuit for reducing noise and performing signal amplification for the RF signal transmitted through the input filter unit 110.

The LNA 120 is also called a low noise amplifier. The signal received at the receiving end of the RF signal processing circuit has a very low power level due to the effects of attenuation and noise. For this reason, the amplification of the input RF signal is necessary. Since the signal is already transmitted including a lot of noise from outside, an amplification function for minimizing noise is necessary, among other things. The LNA 120 is designed to hold the operating point and the matching point so that the NF (Noise Index) is low, and is usually designed to be an NF value between 1.5 and 2.5. The LNA 120 is designed to use a transistor having a low noise figure so as to have a low noise characteristic, and to maximize gain while using fewer thermal noise devices such as resistors.

Meanwhile, the RF signal passed through the input filter unit 110 may need amplification or may not need amplification. That is, when the power level of the RF signal is low, the amplification must be performed through the LNA 120 as described above. However, such amplification is unnecessary when the power level of the RF signal is high. In this case, when amplification is also performed on the RF signal having the high power level, the sensitivity or the reception performance of the RF signal is reduced. Accordingly, the amplification function should be selectively performed according to the power level of the input RF signal.

In addition, when amplification of the RF signal is required, since all RF signals are not input with the same power level, the RF signal must be amplified at different amplification levels according to the power level of the RF signal.

Accordingly, the LNA 120 according to the present invention allows the amplification of the RF signal according to the power level of the RF signal, or provides the path of the RF signal by a bypass path not including itself, thereby performing the amplification. Do not lose. In addition, the LNA 120 amplifies the RF signal by applying different amplification levels according to the power level of the RF signal.

This will be described in more detail with reference to the following.

The first tuning circuit 130 and the second tuning circuit 150 are filter units, and select and transmit an RF signal having a predetermined frequency band from among the input signals.

That is, the first tuning circuit 130 and the second tuning circuit 150 filter the RF signal provided from the previous stage to a desired band and transfer the same to the next stage.

The RF amplifier 140 adjusts an amplification level of the input signal in response to the automatic gain control signal AGC provided by the signal selector 160.

The signal selector 160 delivers the automatic gain control signal. In addition, the signal selector 160 selects and transmits an RF signal having a predetermined frequency band, and includes a phase locked loop circuit (not shown), a mixing circuit (not shown), an amplifier (not shown), and the like. In recent years, it is common to implement these circuits in one chip.

The demodulator 170 recognizes the level of the RF signal currently being processed and transmits it to the signal selector 160.

Hereinafter, the configuration and operation of the LVA 120 will be described in more detail.

3 is a detailed block diagram showing the LNA of FIG.

Referring to FIG. 3, the LNA 120 may include first to N low noise amplifiers 121, first to N switches 122 for controlling the operation of each of the first to N low noise amplifiers 121, and an RF. When a plurality of amplified signals are output through the path switch 123 outputting a signal to the bypass path not including the first to N low noise amplifiers 121 and the first to N low noise amplifiers 121, the synthesized signals are outputted. A synthesizer 124 for generating a synthesized signal, and a switch controller 125 for controlling operations of the path switch 123 and the first to N switches 122 according to an automatic gain control signal input from the outside. Include.

The first to Nth low noise amplifiers 121 amplify and output the RF signal input from the outside according to the amplification level of each of the first to Nth low noise amplifiers 121.

In this case, all of the first to N low noise amplifiers 121 may be low noise amplifiers having the same amplification level. Alternatively, the first to N low noise amplifiers 121 may be low noise amplifiers having different amplification levels.

For example, all of the first to N low noise amplifiers 121 may have a 'level 2' amplification level. Alternatively, the first low noise amplifier may have a 'level 1' amplification level, the second low noise amplifier may have a 'level 2' amplification level, and the Nth low noise amplifier may have a 'level N' amplification level.

The first to N switches 122 control the operation of the corresponding low noise amplifier based on a switching signal input through the switch controller 125. For example, the first switch controls the operation of the first low noise amplifier. In other words, the first switch activates or deactivates the first low noise amplifier according to the control signal of the switch controller 125. Similarly, the second to N switches activate or deactivate the second to N low noise amplifiers, respectively.

The path switch 123 forms an initial path of the input RF signal. That is, the path switch 123 outputs the input RF signal to an activated low noise amplifier according to an automatic gain control signal, or outputs a bypass path not including the low noise amplifier.

That is, if the RF signal is amplified by the low noise amplifier at all times irrespective of the level of the RF signal input from the outside, the characteristics of the RF signal may be deteriorated. That is, when the RF signal is a weak electric field, the RF signal can be effectively amplified by the low noise amplifier. However, in the case of the RF signal of the strong electric field or the medium electric field, the signal sensitivity, interference interference, and multi-signal test (MSG) characteristics are deteriorated. In particular, in the case of the DVB-C 256 QAM type RF signal processing circuit, the reception characteristics are important in the medium and high electric field due to the rapidly increasing data amount. When the medium and the strong electric field RF signal are amplified through the low noise amplifier, Deterioration of the reception characteristics adversely affects signal processing.

Accordingly, in an exemplary embodiment of the present invention, the RF signal is selectively amplified according to the level of the input RF signal.

The synthesis unit 124 synthesizes the amplified signal amplified by the first to N low noise amplifier 121. For example, when only one low noise amplifier is activated, the combiner 124 receives and outputs one amplified signal amplified through the one low noise amplifier. However, when a plurality of low noise amplifiers are activated, the combiner 124 synthesizes a plurality of amplified signals amplified by the plurality of low noise amplifiers and outputs a single synthesized signal.

The switch controller 125 controls the first to N switches 122 and the path switch 123 according to the automatic gain control signal of the RF signal.

For example, when amplification of the RF signal is unnecessary, the switch controller 125 controls the path switch 123 so that the RF signal is output through the bypass path.

On the other hand, when it is necessary to amplify the RF signal, the switch controller 125 determines to what level amplify the RF signal. In other words, the switch controller 125 determines the amplification level of the RF signal.

The switch controller 125 controls the operations of the first to N switches 122 based on the determined amplification level so that at least one low noise amplifier is activated.

For example, when the determined amplification level is '10' and the amplification level of the second low noise amplifier is '10', the switch controller 125 may allow the first to N to be activated so that only the second low noise amplifier is activated. The switch 122 is controlled.

In addition, when the determined amplification level is '10', and each of the amplification levels of the first to N amplifiers 121 is '5', the switch controller 125 may include the first low noise amplifier and the second low noise amplifier. The first to N switches 122 are controlled to be activated.

In other words, the switch controller 125 determines the amplification level of the RF signal based on the automatic gain control signal and controls only one particular low noise amplifier having an amplification level corresponding to the determined amplification level to be activated. .

In addition, the switch controller 125 determines an amplification level of the RF signal based on the automatic gain control signal, and controls the plurality of low noise amplifiers to be activated according to the determined amplification level, wherein the plurality of low noise amplifiers that are activated The sum of the respective amplification levels has a corresponding amplification level of the RF signal.

In addition, the amplification levels of the first to N low noise amplifiers may be different from each other. For example, when the amplification level of the first low noise amplifier is '1', the amplification level of the second low noise amplifier is '2', and the amplification level of the determined RF signal is '3', the switch control unit ( 125 activates the first low noise amplifier and the second low noise amplifier. Accordingly, the sum (1 + 2 = 3) of each amplification level of the activated low noise amplifier corresponds to the determined amplification level of the RF signal.

The combiner 124 synthesizes an amplified signal activated through the plurality of low noise amplifiers.

For example, when the first low noise amplifier and the second low noise amplifier are activated, the synthesis unit 124 synthesizes an amplified signal amplified by the first low noise amplifier and an amplified signal amplified by the second low noise amplifier. do. In this case, the synthesized signal synthesized through the combiner 124 is a signal obtained by amplifying the input RF signal to a specific amplification level, and the specific amplification level corresponds to the sum of the respective amplification levels of the activated low noise amplifier. do.

In other words, a synthesized signal obtained by synthesizing an amplified signal amplified by the first low noise amplifier having a '5' amplification level and the second low noise amplifier having a '5' amplification level is a '10' amplification level for the input RF signal. It is the same signal as the amplified signal amplified by one particular low noise amplifier.

According to an embodiment of the present invention, by amplifying an RF signal with a variable gain, an LNA circuit applicable to various field environments may be implemented. In addition, according to an embodiment of the present invention, by deactivating the LNA circuit in accordance with the field environment, it is possible to monitor in advance the situation where the reception sensitivity and reception performance is reduced due to the amplification of the strong electric field signal, and the power consumption is reduced. Can be reduced.

4 is a flowchart illustrating a step-by-step method of processing an input signal of a receiving apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 4, first, the switch controller 250 receives an automatic gain control signal (step 110). The automatic gain control signal corresponds to a power level of an RF signal input from the outside.

In operation 120, the switch controller 250 determines whether amplification of the RF signal is necessary using the received automatic gain control signal.

In other words, the switch controller 250 determines whether the input RF signal is a strong or medium electric field signal or a weak electric field signal.

If the amplification of the RF signal is unnecessary, in step 120, the switch controller 250 outputs the input RF signal as a bypass path to control the amplification of the RF signal. (Step 130).

In addition, when it is determined in operation 120 that the amplification of the RF signal is necessary, the switch controller 250 determines an amplification level of the input RF signal in operation 140.

In operation 150, the switch controller 250 determines at least one low noise amplifier to be activated according to the determined amplification level. The determined low noise amplifier may be any one low noise amplifier having an amplification level corresponding to the determined amplification level. Alternatively, the determined low noise amplifier may be a plurality of low noise amplifiers in which the sum of the amplification levels that each has corresponds to the determined amplification level.

Thereafter, the activated at least one low noise amplifier amplifies and outputs a predetermined amplification level with respect to the input RF signal (step 160).

Thereafter, the combiner 240 synthesizes signals output through the low noise amplifier (step 170).

As described above, according to the exemplary embodiment of the present invention, an LNA circuit applicable to various field environments may be implemented by amplifying an RF signal with a variable gain. In addition, according to an embodiment of the present invention, by deactivating the LNA circuit in accordance with the field environment, it is possible to monitor in advance the situation where the reception sensitivity and reception performance is reduced due to the amplification of the strong electric field signal, and the power consumption is reduced. Can be reduced.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

110: input filter unit
120: low noise amplifier
130: first tuning circuit
140: RF amplifier
150: second tuning circuit
160: signal selector
170: demodulator

Claims (13)

First to N low noise amplifiers for amplifying an RF signal input from the outside;
First to N switches for controlling the operation of the first to N low noise amplifiers; And
And a switch controller configured to determine a low noise amplifier to be activated according to an automatic gain control signal input from an external device, and output a control signal to a corresponding switch so that the determined low noise amplifier is activated.
And the number of low noise amplifiers to be activated is changed according to the automatic gain control signal. The method of claim 1,
And a bypass path switch disposed in front of the first to N switches and outputting the RF signal to a bypass path that does not include the first to N low noise amplifiers according to the automatic gain control signal. The method of claim 1,
The switch control unit,
And determining an amplification level of the RF signal based on the automatic gain control signal and controlling only one particular low noise amplifier having an amplification level corresponding to the determined amplification level to be activated. The method of claim 1,
The switch control unit,
Determining an amplification level of the RF signal based on the automatic gain control signal, controlling a plurality of low-noise amplifiers to be activated according to the determined amplification level,
And a sum of each amplification level of the plurality of activated low noise amplifiers corresponds to the determined amplification level of the RF signal. 5. The method of claim 4,
Further comprising a synthesizer for synthesizing a plurality of RF signals output through the activated low noise amplifier,
And the RF signal synthesized through the synthesizer is a signal obtained by amplifying the input RF signal to a specific amplification level, and the specific amplification level is a sum of amplification levels of each of the activated low noise amplifiers. 5. The method of claim 4,
Further comprising an RF signal processing unit for processing the synthesized RF signal,
The RF signal processing unit,
An RF amplifier amplifying the synthesized RF signal according to the automatic gain control signal; And
And a signal selector for selecting and outputting only a band of a desired signal among the RF signals amplified by the RF amplifier and providing the automatic gain control signal. Receiving an automatic gain control signal input from the outside; And
Determining a low noise amplifier to be activated among a plurality of low noise amplifiers using the received automatic gain control signal; And
Amplifying an RF signal input from the outside using the determined low noise amplifier,
The number of low noise amplifiers to be activated is changed according to the automatic gain control signal. 8. The method of claim 7,
And outputting the input RF signal as a bypass path according to the received automatic gain control signal. 8. The method of claim 7,
And determining an amplification level of the input RF signal based on the automatic gain control signal. The method of claim 9,
Determining the low noise amplifier to be activated,
Activating any one low noise amplifier having an amplification level corresponding to the determined amplification level. The method of claim 9,
Determining the low noise amplifier to be activated,
Activating a plurality of low noise amplifiers according to the determined amplification level,
And a sum of the amplification levels of the plurality of activated low noise amplifiers corresponds to the amplification level of the determined RF signal. 12. The method of claim 11,
And synthesizing an amplified signal amplified by the activated plurality of low noise amplifiers. 13. The method of claim 12,
And the synthesized synthesized signal is an amplified signal obtained by amplifying the input RF signal at an amplification level corresponding to the sum of the respective amplification levels of the activated plurality of low noise amplifiers.
KR1020110132364A 2011-12-09 2011-12-09 Reveiver with lna and input signal processing method thereof KR20130065485A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160019010A (en) 2014-08-08 2016-02-18 주식회사 네스캡 Electric double layer device
US9485001B2 (en) 2014-10-31 2016-11-01 Skyworks Solutions, Inc. Diversity receiver front end system with switching network
KR101675309B1 (en) * 2015-07-08 2016-11-11 현대자동차주식회사 Replaceable antenna for vehicle and vehicle having the same
US9838056B2 (en) 2015-05-28 2017-12-05 Skyworks Solutions, Inc. Integrous signal combiner
KR102516607B1 (en) * 2022-04-07 2023-03-31 (주)지슨 Broadband RF signal receiver and method

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160019010A (en) 2014-08-08 2016-02-18 주식회사 네스캡 Electric double layer device
US9485001B2 (en) 2014-10-31 2016-11-01 Skyworks Solutions, Inc. Diversity receiver front end system with switching network
US9893794B2 (en) 2014-10-31 2018-02-13 Skyworks Solutions, Inc. Switching network for diversity receivers
US9838056B2 (en) 2015-05-28 2017-12-05 Skyworks Solutions, Inc. Integrous signal combiner
US10009054B2 (en) 2015-05-28 2018-06-26 Skyworks Solutions, Inc. Impedance matching integrous signal combiner
US10447322B2 (en) 2015-05-28 2019-10-15 Skyworks Solutions, Inc. Integrous signal combiner
US11082077B2 (en) 2015-05-28 2021-08-03 Skyworks Solutions, Inc. Integrous signal combiner
KR101675309B1 (en) * 2015-07-08 2016-11-11 현대자동차주식회사 Replaceable antenna for vehicle and vehicle having the same
KR102516607B1 (en) * 2022-04-07 2023-03-31 (주)지슨 Broadband RF signal receiver and method

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