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KR100925809B1 - Matching circuit of terrestrial digital broadcasting tuner - Google Patents

Matching circuit of terrestrial digital broadcasting tuner Download PDF

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Publication number
KR100925809B1
KR100925809B1 KR1020020048833A KR20020048833A KR100925809B1 KR 100925809 B1 KR100925809 B1 KR 100925809B1 KR 1020020048833 A KR1020020048833 A KR 1020020048833A KR 20020048833 A KR20020048833 A KR 20020048833A KR 100925809 B1 KR100925809 B1 KR 100925809B1
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South Korea
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agc amplifier
output terminal
matching circuit
signal
terrestrial digital
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KR1020020048833A
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Korean (ko)
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KR20040016589A (en
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최석동
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엘지이노텍 주식회사
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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
    • H04N5/50—Tuning indicators; Automatic tuning control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

본 발명은 지상파 디지털 방송용 튜너의 매칭회로에 관한 것으로, 상세하게는 IF 신호를 증폭하여 출력하는 IF AGC 앰프와, 상기 IF AGC 앰프로부터 출력되는 IF 신호중 일정 대역의 신호만을 통과시키는 밴드패스필터와, 상기 밴드패스필터에서 필터링된 IF 신호를 복조하여 지상파 방송 신호를 출력하는 OFDM IC를 포함하는 지상파 디지털방송용 튜너에 있어서, 상기 IF AGC 앰프의 출력단과 상기 밴드패스필터의 입력단 사이 임피던스 매칭을 위한 매칭회로가 구비되는 것을 특징으로 한다.The present invention relates to a matching circuit of a terrestrial digital broadcasting tuner, and more particularly, an IF AGC amplifier for amplifying and outputting an IF signal, a band pass filter for passing only a signal of a predetermined band among IF signals output from the IF AGC amplifier, A terrestrial digital broadcast tuner comprising an OFDM IC for demodulating the IF signal filtered by the band pass filter and outputting a terrestrial broadcast signal, the matching circuit for impedance matching between an output terminal of the IF AGC amplifier and an input terminal of the band pass filter. Characterized in that is provided.

따라서 상기와 같이 구성된 본 발명에 따르면 IF AGC 앰프와 OFDM IC 사이에 매칭 회로를 삽입하여 게인 로스를 줄일 수 있다.Therefore, according to the present invention configured as described above it is possible to reduce the gain loss by inserting a matching circuit between the IF AGC amplifier and the OFDM IC.

튜너, IF AGC 앰프, OFDM IC, 매칭, 게인로스Tuner, IF AGC Amplifier, OFDM IC, Matching, Gain Loss

Description

지상파 디지털 방송용 튜너의 매칭회로{MATCHING CIRCUIT OF TUNER FOR GROUND WAVE DIGITAL BROADCASTING}Matching circuit of terrestrial digital broadcasting tuner {MATCHING CIRCUIT OF TUNER FOR GROUND WAVE DIGITAL BROADCASTING}

도 1은 일반적인 지상파 디지털 방송용 튜너의 구성을 개략적으로 나타낸 블록도1 is a block diagram schematically showing the configuration of a general terrestrial digital broadcast tuner;

도 2는 본 발명에 따른 지상파 디지털 방송용 튜너의 매칭회로의 구성을 개략적으로 나타낸 블록도2 is a block diagram schematically showing a configuration of a matching circuit of a terrestrial digital broadcast tuner according to the present invention.

<도면중 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

1 : IF AGC 앰프 2 : 밴드패스필터1: IF AGC Amplifier 2: Band Pass Filter

3 : OFDM IC 100 : 매칭회로3: OFDM IC 100: matching circuit

C1~C3 : 제 1~3콘덴서 L1 : 제 1코일C1 ~ C3: 1st ~ 3rd Capacitor L1: 1st Coil

R1 : 제 1저항R1: first resistance

본 발명은 지상파 디지털 방송용 튜너에 관한 것으로, 상세하게는 IF AGC 앰프와 OFDM IC 사이에 매칭 회로를 삽입하여 게인 로스를 줄이도록 하는 지상파 디지털 방송용 튜너의 매칭회로에 관한 것이다. The present invention relates to a terrestrial digital broadcasting tuner, and more particularly, to a matching circuit of a terrestrial digital broadcasting tuner which reduces a gain loss by inserting a matching circuit between an IF AGC amplifier and an OFDM IC.                         

일반적으로 지상파 디지털방송용 튜너는 도 1에 도시된 바와 같이 IF AGC 앰프(1)에서 IF 신호를 증폭하여 출력하면, 이를 밴드패스필터(2)에서 필터링한 후 OFDM(Orthogonal Frequency Division Multiplexing: 직교 주파수 분할 다중) IC(3)가 IF 신호를 복조하여 지상파 방송 신호를 출력하는 구성으로 이루어져있다.
In general, a terrestrial digital broadcast tuner amplifies and outputs an IF signal from an IF AGC amplifier 1, as shown in FIG. 1, and then filters it in a bandpass filter 2, followed by orthogonal frequency division multiplexing (OFDM). Multiple) IC 3 demodulates the IF signal and outputs a terrestrial broadcast signal.

그러나 이러한 지상파 디지털방송용 튜너는 IF AGC 앰프로 입력되는 신호가 차동 신호로 입력되기 때문에 출력이 듀얼이고, OFDM IC의 입력은 싱글인 관계로 IF AGC 앰프의 제 1출력단만 밴드패스필터와 연결시키고, 제 2출력단은 콘덴서와 저항을 통해 그라운드에 접지시켰기 때문에 약 4~5dB정도의 게인 로스가 발생하는 문제점이 있다.However, the terrestrial digital broadcasting tuner has dual outputs because the signal input to the IF AGC amplifier is input as a differential signal, and only the first output terminal of the IF AGC amplifier is connected to the bandpass filter because the input of the OFDM IC is single. Since the second output terminal is grounded to ground through a capacitor and a resistor, a gain loss of about 4 to 5 dB occurs.

따라서 본 발명의 목적은 상기와 같은 문제점을 해결하기 위한 것으로, IF AGC 앰프와 OFDM IC 사이에 매칭 회로를 삽입하여 게인 로스를 줄이도록 하는데 있다.Accordingly, an object of the present invention is to solve the above problems, and to reduce the gain loss by inserting a matching circuit between the IF AGC amplifier and the OFDM IC.

상기와 같은 목적을 달성하기 위한 본 발명의 특징은,Features of the present invention for achieving the above object,

IF 신호를 증폭하여 출력하는 IF AGC 앰프와, 상기 IF AGC 앰프로부터 출력되는 IF 신호중 일정 대역의 신호만을 통과시키는 밴드패스필터와, 상기 밴드패스필터에서 필터링된 IF 신호를 복조하여 지상파 방송 신호를 출력하는 OFDM IC를 포함하는 지상파 디지털방송용 튜너에 있어서, An IF AGC amplifier for amplifying and outputting an IF signal, a bandpass filter for passing only a signal of a predetermined band among the IF signals output from the IF AGC amplifier, and demodulating the IF signal filtered by the bandpass filter to output a terrestrial broadcast signal In the terrestrial digital broadcasting tuner comprising an OFDM IC,                     

상기 IF AGC 앰프의 출력단과 상기 밴드패스필터의 입력단 사이 임피던스 매칭을 위한 매칭회로가 구비되는 것을 특징으로 한다.And a matching circuit for impedance matching between the output terminal of the IF AGC amplifier and the input terminal of the band pass filter.

여기에서 상기 매칭회로는,Here, the matching circuit,

상기 IF AGC 앰프의 제 1출력단 및 제 2출력단 사이에 병렬 연결되는 제 1저항과,A first resistor connected in parallel between the first output terminal and the second output terminal of the IF AGC amplifier;

상기 IF AGC 앰프의 제 1출력단 및 제 2출력단 사이에 병렬 연결되는 제 1코일과,A first coil connected in parallel between a first output terminal and a second output terminal of the IF AGC amplifier;

상기 IF AGC 앰프의 제 1출력단 및 제 2출력단 사이에 병렬 연결되는 제 1콘덴서로 구성된다.And a first capacitor connected in parallel between the first output terminal and the second output terminal of the IF AGC amplifier.

여기에서 또한 상기 IF AGC 앰프의 제 1출력단 및 제 2출력단에는,Here, the first output terminal and the second output terminal of the IF AGC amplifier,

직류 성분 신호를 제거하도록 제 2콘덴서와, 제 3콘덴서가 각각 연결된다.The second capacitor and the third capacitor are respectively connected to remove the DC component signal.

이하, 본 발명에 의한 지상파 디지털 방송용 튜너의 매칭회로의 구성을 도 2를 참조하여 상세하게 설명하기로 한다. 도 2에 있어서 도 1에 나타낸 지상파 디지털 방송용 튜너와 동일 부분에 대해서는 도 1과 동일한 부호를 부여하여 그에 대한 설명을 생략한다.Hereinafter, the configuration of the matching circuit of the terrestrial digital broadcast tuner according to the present invention will be described in detail with reference to FIG. In FIG. 2, the same parts as those of the terrestrial digital broadcast tuner shown in FIG. 1 are assigned the same reference numerals as in FIG. 1, and description thereof will be omitted.

도 2는 본 발명에 따른 지상파 디지털 방송용 튜너의 매칭회로의 구성을 개략적으로 나타낸 블록도이다.2 is a block diagram schematically illustrating a configuration of a matching circuit of a terrestrial digital broadcast tuner according to the present invention.

도 2를 참조하면, 본 발명에 따른 지상파 디지털 방송용 튜너의 매칭회로(100)는, IF AGC 앰프(1)의 제 1출력단 및 제 2출력단 사이에 병렬 연결되는 제 1저항(R1)과, IF AGC 앰프(1)의 제 1출력단 및 제 2출력단 사이에 병렬 연결 되는 제 1코일(L1)과, IF AGC 앰프(1)의 제 1출력단 및 제 2출력단 사이에 병렬 연결되는 제 1콘덴서(C1)로 구성된다. 여기에서 IF AGC 앰프(1)의 제 1출력단 및 제 2출력단에는 직류 성분 신호를 제거하도록 제 2콘덴서(C2)와, 제 3콘덴서(C3)가 각각 연결된다.Referring to FIG. 2, the matching circuit 100 of the terrestrial digital broadcast tuner according to the present invention includes a first resistor R1 connected in parallel between a first output terminal and a second output terminal of an IF AGC amplifier 1, and an IF. A first coil L1 connected in parallel between the first output terminal and the second output terminal of the AGC amplifier 1, and a first capacitor C1 connected in parallel between the first output terminal and the second output terminal of the IF AGC amplifier 1; It is composed of Here, the second capacitor C2 and the third capacitor C3 are connected to the first output terminal and the second output terminal of the IF AGC amplifier 1 so as to remove a DC component signal.

이하 본 발명에 따른 지상파 디지털 방송용 튜너의 매칭회로의 동작을 도 2를 참조하여 상세하게 설명하면 다음과 같다.Hereinafter, the operation of the matching circuit of the terrestrial digital broadcasting tuner according to the present invention will be described in detail with reference to FIG. 2.

IF AGC 앰프(1)에서 IF 신호를 증폭하여 출력하면, 증폭 출력된 IF 신호는 제 2콘덴서(C2)와 제 3콘덴서(C3)에 의해 IF 신호중에 포함된 직류 성분의 신호가 제거된 상태에서 매칭회로(100)로 입력된다.If the IF AGC amplifier 1 amplifies and outputs the IF signal, the amplified output IF signal is removed in the state where the signal of the DC component included in the IF signal is removed by the second capacitor C2 and the third capacitor C3. It is input to the matching circuit 100.

그러면 매칭회로(100)에서 임피던스 매칭이 이루어진 다음, I밴드패스필터(2)로 입력된다. 그러면 I밴드패스필터(2)에서 IF AGC 앰프(1)로부터 출력되는 IF 신호중 일정 대역의 신호만을 통과시키면, OFDM IC(3)에서 I밴드패스필터(2)에서 필터링된 IF 신호를 복조하여 지상파 방송 신호를 출력한다.Then, impedance matching is performed in the matching circuit 100, and then input to the I band pass filter 2. Then, if the I band pass filter 2 passes only a signal of a predetermined band among the IF signals output from the IF AGC amplifier 1, the OFDM IC 3 demodulates the IF signal filtered by the I band pass filter 2 and terrestrial wave. Outputs a broadcast signal.

따라서 IF AGC 앰프의 제 1출력단 및 제 2출력단 모두를 밴드패스필터와 연결시키는 매칭회로를 삽입함으로써 게인 로스가 약 1~2dB정도로 저하된다.Therefore, the gain loss is reduced to about 1 to 2 dB by inserting a matching circuit connecting both the first output terminal and the second output terminal of the IF AGC amplifier to the band pass filter.

이상에서 설명한 바와 같이 본 발명에 따른 지상파 디지털 방송용 튜너의 매칭회로에 의하면, IF AGC 앰프와 OFDM IC 사이에 매칭 회로를 삽입하여 게인 로스를 줄일 수 있다.As described above, according to the matching circuit of the terrestrial digital broadcasting tuner according to the present invention, the gain loss can be reduced by inserting a matching circuit between the IF AGC amplifier and the OFDM IC.

Claims (3)

IF 신호를 증폭하여 출력하는 IF AGC 앰프와, 상기 IF AGC 앰프로부터 출력되는 IF 신호중 일정 대역의 신호만을 통과시키는 밴드패스필터와, 상기 밴드패스필터에서 필터링된 IF 신호를 복조하여 지상파 방송 신호를 출력하는 OFDM IC를 포함하는 지상파 디지털방송용 튜너에 있어서,An IF AGC amplifier for amplifying and outputting an IF signal, a bandpass filter for passing only a signal of a predetermined band among the IF signals output from the IF AGC amplifier, and demodulating the IF signal filtered by the bandpass filter to output a terrestrial broadcast signal In the terrestrial digital broadcasting tuner comprising an OFDM IC, 상기 IF AGC 앰프의 듀얼 출력단과 상기 밴드패스필터의 입력단 사이에 임피던스 매칭을 위한 매칭회로를 설치하여 상기 IF AGC 앰프의 듀얼 출력단 모두를 상기 밴드패스필터와 연결시킴으로써 게인 로스(gain loss)를 저하시킨 것을 특징으로 하는 지상파 디지털 방송용 튜너의 매칭회로.A matching circuit for impedance matching is provided between the dual output terminal of the IF AGC amplifier and the input terminal of the band pass filter to reduce gain loss by connecting both dual output terminals of the IF AGC amplifier with the band pass filter. Matching circuit of a terrestrial digital broadcast tuner, characterized in that. 제 1 항에 있어서,The method of claim 1, 상기 매칭회로는,The matching circuit, 상기 IF AGC 앰프의 제 1출력단 및 제 2출력단 사이에 병렬 연결되는 제 1저항과,A first resistor connected in parallel between the first output terminal and the second output terminal of the IF AGC amplifier; 상기 IF AGC 앰프의 제 1출력단 및 제 2출력단 사이에 병렬 연결되는 제 1코일과,A first coil connected in parallel between a first output terminal and a second output terminal of the IF AGC amplifier; 상기 IF AGC 앰프의 제 1출력단 및 제 2출력단 사이에 병렬 연결되는 제 1콘덴서로 구성되는 것을 특징으로 하는 지상파 디지털 방송용 튜너의 매칭회로.Matching circuit of a terrestrial digital broadcasting tuner, comprising a first capacitor connected in parallel between a first output terminal and a second output terminal of the IF AGC amplifier. 제 2 항에 있어서,The method of claim 2, 상기 IF AGC 앰프의 제 1출력단 및 제 2출력단에는 직류 성분 신호를 제거하도록 제 2콘덴서와, 제 3콘덴서가 각각 연결되는 것을 특징으로 하는 지상파 디지털 방송용 튜너의 매칭회로.And a second capacitor and a third capacitor are respectively connected to the first output terminal and the second output terminal of the IF AGC amplifier to remove a DC component signal.
KR1020020048833A 2002-08-19 2002-08-19 Matching circuit of terrestrial digital broadcasting tuner KR100925809B1 (en)

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KR101469635B1 (en) * 2008-11-24 2014-12-05 엘지이노텍 주식회사 Automatic gain control circuit for digital intermediate frequency

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09214843A (en) * 1995-09-26 1997-08-15 Sharp Corp Digital satellite broadcast receiver
JP2001060887A (en) * 1999-08-20 2001-03-06 Sharp Corp Electronic tuner
KR20020014256A (en) * 2000-08-17 2002-02-25 박종섭 Receiver of digital television system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09214843A (en) * 1995-09-26 1997-08-15 Sharp Corp Digital satellite broadcast receiver
JP2001060887A (en) * 1999-08-20 2001-03-06 Sharp Corp Electronic tuner
KR20020014256A (en) * 2000-08-17 2002-02-25 박종섭 Receiver of digital television system

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