KR100254884B1 - Apparatus for controlling low noise amplifying part of microwave receiver - Google Patents

Apparatus for controlling low noise amplifying part of microwave receiver Download PDF

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Publication number
KR100254884B1
KR100254884B1 KR1019970026865A KR19970026865A KR100254884B1 KR 100254884 B1 KR100254884 B1 KR 100254884B1 KR 1019970026865 A KR1019970026865 A KR 1019970026865A KR 19970026865 A KR19970026865 A KR 19970026865A KR 100254884 B1 KR100254884 B1 KR 100254884B1
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South Korea
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low noise
pin
tuner
noise amplifier
signal
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KR1019970026865A
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Korean (ko)
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KR19990003069A (en
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박경춘
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이형도
삼성전기주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/189—High frequency amplifiers, e.g. radio frequency amplifiers
    • H03F3/19—High frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
    • H03F3/193—High frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only with field-effect devices
    • 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]

Abstract

PURPOSE: An apparatus for controlling low noise amplifier is to simplify the apparatus using an analog/digital converting function of a PLL(phase locked loop) portion included in a tuner, thereby precisely controlling the low noise amplifier and reducing fabricating cost. CONSTITUTION: A demodulating portion(30) demodulates a middle frequency signal of a tuner(20) and outputs as a baseband signal, and then provides an automatic gain controlling voltage according to an intensity of the baseband signal to an analog/digital converting pin of a PLL(25) of the tuner. The tuner converts the automatic gain controlling voltage into digital data though the analog/digital converting pin and provides the digital data to a data pin. The PLL provides a switching voltage according to an electric field detecting signal to a band pin. The electric field detecting signal is received through the data pin from a micro-computer(50). The micro-computer scans the digital data corresponding to the automatic gain controlling voltage, and compares the digital data with a reference data, and transmits the electric field detecting signal to a bidirectional data line. A low noise amplifier(10) performs an amplifying operation according to the switching voltage from the band pin.

Description

고주파수신기의 저잡음증폭부 제어장치Low noise amplifier control device of high frequency receiver

본 발명은 고주파수신기의 저잡음증폭부 제어장치에 관한 것으로, 특히 고주파수신기의 저잡음증폭부에 대한 동작을 제어하는 장치를 튜너에 포함된 PLL부의 A/D변환 기능을 이용하여 간략화시킴으로써, 저잡음증폭부로의 정확한 제어가 가능함은 물론, 생산단가를 절감할 수 있도록한 고주파수신기의 저잡음증폭부 제어장치에 관한 것이다.The present invention relates to an apparatus for controlling a low noise amplifier of a high frequency receiver. In particular, the apparatus for controlling the operation of the low noise amplifier of a high frequency receiver is simplified by using the A / D conversion function of the PLL unit included in the tuner. The present invention relates to a low-noise amplifier control device of a high frequency receiver capable of precise control of a product and of reducing a production cost.

제1도는 종래의 고주파수신기의 구성도로서, 제1도를 참조하면, 종래의 고주파수신기는 안테나를 통한 고주파신호를 마이컴(5)의 스위칭전압(VSW)에 따라 증폭하는 저잡음 증폭부(1)와, 상기 저잡음증폭부(1)에서 증폭된 고주파신호를 자동이득제어전압(VAGC)에 따라 이득을 제어하고 튜닝하여 중간주파신호를 출력하는 튜너(2)와, 상기 튜너(2)로부터의 중간주파신호를 복조하고, 베이스밴드신호의 크기에 따른 자동이득제어전압(VAGC)을 상기 튜너(2) 및 비교기로 제공하는 복조부(3)와, 상기 복조부(3)로부터의 자동이득제어전압(VAGC)을 기준전압과 비교한후 하이 또는 로우레벨을 마이컴으로 제공하는 비교기(4)와, 상기 비교기(4)로부터 제공되는 레벨에 따라 저잡음증폭부(10)로 스위칭전압(VSW)을 제공하는 마이컴(5)으로 구성되어 있다.FIG. 1 is a block diagram of a conventional high frequency receiver. Referring to FIG. 1, the conventional high frequency receiver 1 amplifies a high frequency signal through an antenna according to a switching voltage V SW of a microcomputer 5. And a tuner (2) for controlling and tuning a high frequency signal amplified by the low noise amplifier (1) according to an automatic gain control voltage (V AGC ) to output an intermediate frequency signal, and from the tuner (2). A demodulation section (3) for demodulating the intermediate frequency signal of the signal and providing an automatic gain control voltage (V AGC ) to the tuner (2) and the comparator according to the magnitude of the baseband signal; After comparing the gain control voltage V AGC with the reference voltage, the comparator 4 provides a high or low level to the microcomputer and the low voltage amplifier 10 according to the level provided from the comparator 4. It consists of the microcomputer 5 which provides V SW ).

상기와같이 구성된 종래의 고주파수신기에서는 수신기의 잡음제한 및 감도를 개선하기 위해서 사용되는 저잡음증폭부는 약전계지역의 신호상태에서는 양호한 동작을 하지만, 강전계의 수신시 튜너 또는 복조부의 포화, 신호간섭 및 왜곡을 방지하기 위해 저잡음증폭부의 이득을 줄이거나 신호를 손실없이 통과시키기 위해 복조부에서 제공되는 자동이득제어전압(VAGC)을 비교기를 통해 마이컴이 신호의 레벨을 인식한후 저잡음증폭부의 스위칭포트로 스위칭전압을 제공하여 저잡음증폭부를 온/오프하도록 되어 있다.In the conventional high frequency receiver configured as described above, the low noise amplifier used to improve the noise limit and sensitivity of the receiver works well in the signal state of the weak electric field, but the saturation, signal interference and To reduce the gain of the low noise amplifier to prevent distortion or to pass the signal without loss, the auto gain control voltage (V AGC ) provided by the demodulator uses a comparator to recognize the level of the signal and then the switching port of the low noise amplifier. The low noise amplifier is turned on / off by providing a switching voltage.

이와같은 종래의 텔레비젼 튜너에서 저잡음증폭부에 대한 동작을 제어하는 장치에 대한 문제점은 다음과 같다.Problems with the apparatus for controlling the operation for the low noise amplifier in such a conventional TV tuner are as follows.

종래의 고주파수신기에서의 저잡음증폭부 제어장치는 복조부에서 제공되는 자동이득제어전압(VAGC)을 인지하여 적정 자동이득제어전압(VAGC)상태에서 저잡음증폭부를 온 또는 오프시킬 목적으로 마이컴으로 신호를 제공하는 비교기의 회로를 별도로 구비하여야 하고, 마이컴은 비교기의 신호를 제공받는 포트1개와 저잡음증폭부로 스위칭전압을 제공하는 포트1개가 필요하게 되는 문제점이 있다.In the conventional high frequency receiver, the low noise amplifier control device recognizes the automatic gain control voltage (V AGC ) provided from the demodulator and transfers the low noise amplifier unit to the microcomputer for the purpose of turning on or off the low noise amplifier unit in the appropriate automatic gain control voltage (V AGC ) state. A circuit of a comparator for providing a signal must be separately provided, and the microcomputer has a problem in that one port for receiving a signal of the comparator and one port for providing a switching voltage to the low noise amplifier are required.

본 발명은 상기한 문제점을 해결하기 위해 안출한 것이다.The present invention has been made to solve the above problems.

따라서, 본 발명의 목적은 고주파수신기의 저잡음증폭부에 대한 동작을 제어하는 장치를 튜너에 포함된 PLL부의 A/D변환기능을 이용하여 간략화시킴으로써, 저잡음증폭부로의 정확한 제어가 가능함은 물론, 생산단가를 절감할 수 있도록한 고주파수신기의 저잡음증폭부 제어장치를 제공하는데 있다.Accordingly, an object of the present invention is to simplify the apparatus for controlling the operation of the low noise amplifier of the high frequency receiver by using the A / D conversion function of the PLL unit included in the tuner, so that accurate control to the low noise amplifier is possible, as well as production. It is to provide a low noise amplifier control device of a high frequency receiver to reduce the unit cost.

제1도는 종래의 고주파수신기의 구성도이다.1 is a block diagram of a conventional high frequency receiver.

제2도는 본 발명에 따른 고주파수신기의 구성도이다.2 is a block diagram of a high frequency receiver according to the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

10 : 저잡음증폭부 20 : 튜너10: low noise amplifier 20: tuner

25 : PLL부 30 : 복조부25: PLL section 30: demodulation section

40 : 마이컴40: micom

상기한 본 발명의 목적을 달성하기 위한 기술적인 수단으로써, 본 발명의 장치는 저잡음증폭부를 포함하는 고주파수신기에서 저잡음증폭부의 동작을 제어하는 장치에 있어서, 튜너로부터의 중간주파신호를 복조하여 베이스밴드신호를 출력하며, 이 베이스밴드신호의 크기에 따른 자동이득제어전압을 튜너내 PLL부의 A/D변환핀으로 제공하는 복조부; 상기 복조부의 자동이득제어전압을 A/D변환핀으로 제공받아 자동이득제어전압을 디지털데이타로 변환시켜 데이타핀으로 제공하고, 마이컴으로부터 데이타핀을 통해 제공받은 전계감지신호에 따른 스위칭전압을 밴드핀으로 제공하는 PLL부를 포함한 튜너; 상기 튜너내 PLL부의 데이타핀에 접속된 양방향데이타라인을 통해서 자동이득제어전압에 해당하는 디지탈데이타를 스캐닝한후 내부 기준값과 비교하고, 이 비교결과에 따른 전계감지신호를 상기 양방향데이타라인으로 제공하는 마이컴; 상기 튜너내 PLL부의 밴드핀으로부터의 스위칭전압에 따라서 증폭동작이 온 또는 오프되는 저잡음증폭부;를 구비함을 특징으로 한다.As a technical means for achieving the above object of the present invention, the apparatus of the present invention is a device for controlling the operation of the low noise amplifier in a high frequency receiver including a low noise amplifier, demodulating the baseband signal from the tuner baseband A demodulator for outputting a signal and providing an automatic gain control voltage according to the magnitude of the baseband signal to an A / D conversion pin of the PLL unit in the tuner; The automatic gain control voltage of the demodulator is provided as an A / D conversion pin, and the automatic gain control voltage is converted into digital data to be provided as a data pin, and the switching voltage according to the electric field sensing signal received from the microcomputer through the data pin is a band pin. A tuner including a PLL unit to be provided; Scan the digital data corresponding to the automatic gain control voltage through the bidirectional data line connected to the data pin of the PLL section of the tuner, compare the digital data with the internal reference value, and provide the electric field sensing signal according to the comparison result to the bidirectional data line. Micom; And a low noise amplifier section in which the amplification operation is turned on or off in accordance with the switching voltage from the band pin of the PLL section in the tuner.

이하, 본 발명에 따른 고주파수신기의 저잡음증폭부 제어장치의 바람직한 실시예를 첨부한 도면을 참조하여 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings a preferred embodiment of the low noise amplifier control device of the high frequency receiver according to the present invention will be described in detail.

제2도는 본 발명에 따른 고주파수신기의 구성도로서, 제2도를 참조하면, 본 발명에 따른 고주파수신기에서, 10은 저잡음증폭부이며, 이는 튜너(20)내 PLL부(25)의 밴드핀(Pb)으로부터의 스위칭전압(VSW)에 따라서 안테나(ANT)를 통한 고주파신호를 증폭하거나 또는 그대로 통과시키는 증폭기이다.2 is a block diagram of a high frequency receiver according to the present invention. Referring to FIG. 2, in the high frequency receiver according to the present invention, 10 is a low noise amplification part, which is a band pin of the PLL part 25 in the tuner 20. The amplifier amplifies or passes the high frequency signal through the antenna ANT according to the switching voltage V SW from Pb.

20은 튜너이며, 이는 상기 저잡음증폭부(10)로부터의 고주파신호를 주파수변환과정을 통해서 중간주파신호로 변환함에 의해서 채널튜닝을 수행하는 채널동조부이며, 이에는 복조부(30)의 자동이득제어전압(VAGC)을 A/D변환핀(PADC)으로 제공받아 자동이득제어전압(VAGC)을 디지탈데이타로 변환시켜 데이타핀(Pd)으로 제공하고, 마이컴으로부터 데이타핀(Pd)을 통해 제공받은 전계감지신호에 따른 스위칭전압(VSW)을 밴드핀(Pb)으로 제공하는 PLL부(25)를 포함하고 있다.20 is a tuner, which is a channel tuning unit for performing channel tuning by converting a high frequency signal from the low noise amplification unit 10 into an intermediate frequency signal through a frequency conversion process, which is an automatic gain of the demodulation unit 30. The control voltage (V AGC ) is supplied to the A / D conversion pin (P ADC ) and the automatic gain control voltage (V AGC ) is converted into digital data to provide the data pin (Pd), and the data pin (Pd) from the microcomputer is provided. It includes a PLL unit 25 for providing the switching voltage (V SW ) according to the electric field detection signal provided through the band pin (Pb).

30은 복조부이며, 이는 상기 튜너(20)로부터의 중간주파신호를 복조함에 따라 생성되는 베이스밴드신호를 텔레비젼화면으로 출력하며, 또한 상기 베이스밴드신호의 크기에 따른 자동이득제어전압(VAGC)을 상기 튜너(20)내 PLL부(25)의 A/D변환핀(PADC)으로 제공하는 회로블럭이다.30 is a demodulator, which outputs a baseband signal generated by demodulating the intermediate frequency signal from the tuner 20 on a television screen, and also has an automatic gain control voltage (V AGC ) according to the magnitude of the baseband signal. Is a circuit block for providing the A / D conversion pin (P ADC ) of the PLL unit 25 in the tuner 20.

50은 마이컴이며, 이는 상기 튜너(20)내 PLL부(25)의 데이타핀(Pd)에 접속된 양방향데이타라인(LDATA)을 통해서 자동이득제어전압(VAGC)에 해당하는 디지탈데이타를 스캐닝한후 내부 기준값과 비교하고, 이 비교결과에 따른 전계감지신호를 상기 양방향데이타라인(LDATA)으로 제공하는 제어장치이다.50 is a microcomputer, which scans the digital data corresponding to the automatic gain control voltage V AGC through the bidirectional data line LDATA connected to the data pin Pd of the PLL unit 25 in the tuner 20. It is compared with the internal reference value, and the control device for providing the electric field detection signal according to the comparison result to the bidirectional data line (LDATA).

이와같이 구성된 본 발명의 장치에 따른 동작을 첨부도면에 의거하여 하기에 상세히 설명한다.Operation according to the device of the present invention configured as described above will be described in detail below based on the accompanying drawings.

본 발명에 적용될 수 있는 고주파수신기는 저잡음증폭부를 사용하고 있는 고주파수신기는 모두 적용가능하며, 예를들면, 텔레비젼수신기, 위성방송수신기, 비디오테이프레코더등이다.The high frequency receiver which can be applied to the present invention is applicable to all high frequency receivers using a low noise amplifier, for example, a television receiver, a satellite broadcast receiver, a video tape recorder, and the like.

제2도를 참조하여 고주파수신동작을 간단히 설명한 다음에, 이 고주파수신동작중에 수행되는 본 발명에 따른 저잡음증폭부의 제어동작에 대해서 설명한다.Next, the high frequency reception operation will be briefly described with reference to FIG. 2, and then the control operation of the low noise amplifier according to the present invention performed during the high frequency reception operation will be described.

먼저, 고주파수신동작을 살펴보면, 안테나(ANT)로부터의 고주파신호는 저잡음증폭부(10)에서 소정의 크기로 증폭된 다음에 튜너(20)로 제공되고, 상기 튜너(20)는 상기 증폭된 고주파신호를 주파수변환과정을 통해 중간주파신호로 변환시키는 동작으로 채널동조를 수행하는데, 이와같은 채널동조과정에서는 PLL부(25)에 의한 주파수위상동기기능에 따라 희망채널을 선택하여 이 채널에 고정시킨다. 그리고 상기 튜너(20)로부터의 중간주파신호는 복조부(30)에서 복조과정을 통해서 베이스밴드신호로 출력되는데, 이 베이스밴드신호의 크기를 검출하여 자동이득제어전압(VAGC)을 제공한다.First, referring to the high frequency reception operation, the high frequency signal from the antenna ANT is amplified to a predetermined size in the low noise amplifier 10 and then provided to the tuner 20, and the tuner 20 is the amplified high frequency. Channel tuning is performed by converting a signal into an intermediate frequency signal through a frequency conversion process. In such a channel tuning process, a desired channel is selected and fixed to this channel according to the frequency phase synchronization function of the PLL unit 25. . In addition, the intermediate frequency signal from the tuner 20 is output as a baseband signal through a demodulation process in the demodulator 30, and detects the magnitude of the baseband signal to provide an automatic gain control voltage V AGC .

다음으로, 상기 저잡음증폭부(10)의 제어동작에 대해서 설명하면, 상기 복조부(30)에서 제공되는 자동이득제어전압(VAGC)은 튜너(20)내 PLL부(25)의 A/D변환핀(PADC)으로 제공되는데, 상기 PLL부(25)는 이 A/D변환핀(PADC)으로 제공받은 자동이득제어전압(VAGC)을 디지탈데이타로 변환시킨후 데이타핀(Pd)으로 제공하면, 이 데이타핀(Pd)에 접속된 양방향데이타라인(LDATA)을 통해 상기 자동이득제어전압(VAGC)에 해당하는 디지탈데이타를 마이컴(50)이 스캐닝하고, 이 디지탈데이타에 의한 수치와 사전에 설정된 기준값을 비교한 다음에 디지탈데이타의 값이 큰 경우에는 강전계감지신호인 로우레벨을, 반면에 디지탈데이타에의 값이 작을 경우에는 약전계감지신호인 하이레벨을 상기 양방향데이타라인(LDATA)을 통해서 상기 PLL부(25)로 제공한다.Next, the control operation of the low noise amplifier 10, the automatic gain control voltage (V AGC ) provided from the demodulator 30 is the A / D of the PLL unit 25 in the tuner 20 It is provided as a conversion pin (P ADC ), and the PLL unit 25 converts the automatic gain control voltage V AGC received from the A / D conversion pin (P ADC ) into digital data and then the data pin (Pd). If provided, the microcomputer 50 scans the digital data corresponding to the automatic gain control voltage V AGC through the bidirectional data line LDATA connected to the data pin Pd, and the numerical value according to the digital data. After comparing the reference value with the preset reference value, if the value of the digital data is large, the low level, which is a strong electric field detection signal, and if the value of the digital data is small, the high level, the weak field detection signal, is used as the bidirectional data line. It is provided to the PLL unit 25 through (LDATA).

상기 PLL부(25)는 상기 양방향데이타라인(LDATA)을 통해 마이컴(50)으로부터의 전계감지신호의 레벨에 따라서, 밴드핀(Pb)으로 스위칭전압(VSW)을 제공하는데, 상기 강전계감지신호인 로우레벨인 경우에는 스위칭전압(VSW)을 스위칭오프에 해당하는 전압으로 제공하고, 반면에 약전계감지신호인 하리레벨인 경우에는 스위칭전압(VSW)을 스위칭온에 해당되는 전압으로 제공한다.The PLL unit 25 provides the switching voltage V SW to the band pin Pb according to the level of the electric field sensing signal from the microcomputer 50 through the bidirectional data line LDATA. In the low level of the signal, the switching voltage V SW is provided as the voltage corresponding to the switching off, while in the low level of the weak field detection signal, the switching voltage V SW is set to the voltage corresponding to the switching on. to provide.

상기 저잡음증폭부(10)는 상기 PLL부(25)의 밴드핀(Pb)에 접속된 스위칭포트를 통한 스위칭전압(VSW)에 따라 수신된 고주파신호를 증폭하거나, 수신된 고주파신호를 그대로 통과시키는데, 상기 스위칭전압(VSW)이 스위칭온전압이상이면 저잡음증폭부는 증폭동작을 수행하고, 상기 스위칭전압(VSW)이 스위칭온전압이하, 즉 스위칭오프전압일 경우에는 저잡음증폭부(10)는 증폭동작없이 수신된 고주파신호를 그대로 통과시킨다.The low noise amplifier 10 amplifies the received high frequency signal according to the switching voltage V SW through the switching port connected to the band pin Pb of the PLL unit 25 or passes the received high frequency signal as it is. When the switching voltage V SW is greater than or equal to the switching on voltage, the low noise amplifier performs an amplification operation. When the switching voltage V SW is equal to or less than the switching on voltage, that is, the switching off voltage, the low noise amplifier 10 is performed. Passes the high frequency signal as it is without amplification.

상기한 바와같은 본 발명에 의하면, 고주파수신기에서 수신 전계강도에 따라서 저잡음증폭부의 제어를, 종래와 같은 비교기등을 사용할 필요가 없는 관계로, 저잡음 증폭부의 제어장치를 간단하게 구현시킴으로서, 생산단가를 줄일 수 있는 것이다.According to the present invention as described above, since the control unit of the low noise amplifier according to the received electric field strength in the high frequency receiver does not need to use a comparator or the like in the related art, the control unit of the low noise amplification unit is simply implemented, thereby reducing the cost It can be reduced.

상술한 바와같은 본 발명에 따르면, 고주파수신기의 저잡음증폭부에 대한 동작을 제어하는 장치를 튜너에 포함된 PLL부의 A/D변환기능을 이용하여 간략화시킴으로써, 저잡음증폭부로의 정확한 제어가 가능함은 물론, 생산단가를 절감할 수 있는 특별한 효과가 있다.According to the present invention as described above, by simplifying the device for controlling the operation of the low noise amplifier of the high frequency receiver using the A / D conversion function of the PLL unit included in the tuner, accurate control to the low noise amplifier is possible, of course. This has the special effect of reducing production costs.

이상의 설명은 본 발명의 일실시예에 대한 설명에 불과하며, 본 발명은 그 구성의 범위내에서 다양한 변경 및 개조가 가능하다. 또한, 본 발명의 기술분야에서 통상의 지식을 가진자라면 상기 고주파수신기의 저잡음증폭부 제어장치가 상기 기술한 실시예에 한정되지 않음을 용이하게 알 수 있을 것이다.The above description is only a description of one embodiment of the present invention, the present invention is capable of various changes and modifications within the scope of the configuration. In addition, one of ordinary skill in the art will readily recognize that the low noise amplifier control device of the high frequency receiver is not limited to the above-described embodiment.

Claims (1)

저잡음증폭부를 포함하는 고주파수신기에서 저잡음증폭부의 동작을 제어하는 장치에 있어서, 튜너로부터의 중간주파신호를 복조하여 베이스밴드신호를 출력하며, 이 베이스밴드 신호의 크기에 따른 자동이득제어전압(VAGC)을 튜너내 PLL부의 A/D변환핀(PADC)으로 제공하는 복조부(30); 상기 복조부(30)의 자동이득제어전압(VAGC)을 A/D변환핀(PADC)으로 제공받아 자동이득제어전압(VAGC)을 디지탈데이타로 변환시켜 데이타핀(Pd)으로 제공하고, 마이컴으로부터 데이타핀(Pd)을 통해 제공받은 전계감지신호에 따른 스위칭전압(VSW)을 밴드핀(Pd)으로 제공하는 PLL부(25)를 포함한 튜너(20); 상기 튜너(20)내 PLL부(25)의 데이타핀(Pd)에 접속된 양방향데이타라인(LDATA)을 통해서 자동이득제어전압(VAGC)에 해당하는 디지탈데이타를 스캐닝한 후 내부 기준값과 비교하고, 이 비교결과에 따른 전계잠지신호를 상기 양방향데이타라인(LDATA)으로 제공하는 마이컴(50); 상기 튜너(20)내 PLL부(25)의 밴드핀(Pb)으로부터의 스위칭전압(VSW)에 따라서 증폭동작이 온 또는 오프되는 저잡음증폭부(10);를 구비함을 특징으로 하는 고주파수신기의 저잡음증폭부 제어장치.A device for controlling the operation of a low noise amplifier in a high frequency receiver including a low noise amplifier, comprising: demodulating an intermediate frequency signal from a tuner and outputting a baseband signal, and an automatic gain control voltage (V AGC) according to the magnitude of the baseband signal. ) Demodulator 30 for providing the PLL to the A / D conversion pin (P ADC ) in the tuner; The auto gain control voltage V AGC of the demodulator 30 is provided to the A / D conversion pin P ADC and the auto gain control voltage V AGC is converted into digital data to provide the data pin Pd. A tuner 20 including a PLL unit 25 for providing the switching voltage V SW according to the electric field sensing signal received from the microcomputer through the data pin Pd to the band pin Pd; The digital data corresponding to the automatic gain control voltage V AGC is scanned through the bidirectional data line LDATA connected to the data pin Pd of the PLL unit 25 in the tuner 20, and then compared with an internal reference value. A microcomputer 50 providing the electric field locking signal according to the comparison result to the bidirectional data line LDATA; And a low noise amplifier section 10 in which the amplification operation is turned on or off in accordance with the switching voltage V SW of the band pin Pb of the PLL section 25 in the tuner 20. Low noise amplifier control unit.
KR1019970026865A 1997-06-24 1997-06-24 Apparatus for controlling low noise amplifying part of microwave receiver KR100254884B1 (en)

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