KR100659324B1 - Tuner for radio frequency - Google Patents

Tuner for radio frequency Download PDF

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Publication number
KR100659324B1
KR100659324B1 KR1020060012047A KR20060012047A KR100659324B1 KR 100659324 B1 KR100659324 B1 KR 100659324B1 KR 1020060012047 A KR1020060012047 A KR 1020060012047A KR 20060012047 A KR20060012047 A KR 20060012047A KR 100659324 B1 KR100659324 B1 KR 100659324B1
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South Korea
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output
mopll
tuner
unbalanced
impedance
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KR1020060012047A
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Korean (ko)
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문정호
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엘지이노텍 주식회사
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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
    • H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/38—Impedance-matching networks
    • 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

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

A tuner of an RF receiver is provided to configure the operation of a balance MOPLL IC by acquiring two outputs through an unbalance MOPLL IC and a distributor, thereby acquiring a balance output at a low cost. A tuner of an RF(Radio Frequency) receiver comprises the followings: an unbalance MOPLL(Mixer Oscillator Phase Locked Loop) IC(Integrated Circuit)(10) for generating one output; a distributor(20) which distributes the one output, generated from an output unit of the unbalance MOPLL IC(10), into first and second outputs; a first impedance matching unit(11) for matching impedance of the first output; and a second impedance matching unit(12) for matching impedance of the second output.

Description

알에프 수신장치의 튜너{tuner for radio frequency}Tuner for RF receiver {tuner for radio frequency}

도 1은 종래의 언밸런스 MOPLL IC로부터 밸런스 출력을 얻기 위하여 구성된 회로도,1 is a circuit diagram configured to obtain a balanced output from a conventional unbalanced MOPLL IC;

도 2는 본 발명의 일 실시예의 회로도 2 is a circuit diagram of one embodiment of the present invention;

〈 도면의 주요 부호에 대한 설명〉<Description of Major Codes in Drawings>

10: MOPLL IC10: MOPLL IC

11, 12: 임피이던스 매칭부11, 12: impedance matching unit

20: 분배기20: distributor

본 발명은 RF 수신장치의 튜너에 관한 것이다.The present invention relates to a tuner of an RF receiver.

RF 수신장치에 사용되는 튜너의 MOPLL(Mixer Oscillator Phase Locked Loop) IC에는 동일한 신호를 복수로 출력하는 밸런스 타입과 하나의 신호만을 출력하는 언밸런스 타입이 사용되고 있다.Tuner's Mixer Oscillator Phase Locked Loop (MOPLL) IC used in RF receivers uses a balanced type that outputs the same signal in multiple numbers and an unbalanced type that outputs only one signal.

튜너의 밸런스 타입과 언밸런스 타입의 적용은 튜너 후단에 설치되는 TV, 셋탑박스 등의 설계사양에 의하여 결정된다. 따라서, 튜너의 MOPLL IC는 튜너 후단의 장치에 따라서 밸런스 타입이나 언밸런스 타입으로 각각 제작되어져야 한다. 밸런스 타입의 MOPLL IC를 언밸런스 타입으로 사용하는 경우에는 고가의 밸런스 타입을 단순히 언밸런스 타입으로 사용하기 때문에 제조원가면에서 합리적이지 못하고, 언밸런스 타입은 밸런스 타입으로 사용할 수 없기 때문에 두 개의 MOPLL IC를 별도로 설치해야 하는 문제점이 있다.The application of the balance type and the unbalance type of the tuner is determined by the design specifications of the TV and the set-top box installed at the rear of the tuner. Therefore, the tuner's MOPLL IC must be manufactured in balanced or unbalanced type, depending on the device behind the tuner. When using a balanced MOPLL IC as an unbalanced type, it is not reasonable in terms of manufacturing cost because an expensive balanced type is simply used as an unbalanced type, and an unbalanced type cannot be used as a balanced type. There is a problem.

도 1은 종래의 언밸런스 MOPLL IC로부터 밸런스 출력을 얻기 위하여 구성된 회로도이다.1 is a circuit diagram configured to obtain a balanced output from a conventional unbalanced MOPLL IC.

언밸랜스 MOPLL IC1(2), MOPLLIC2(3)은 각각 언밸런스 출력이 직류 컷트용 콘덴서(C1)를 통하여 임피이던스 매칭회로(1)에 입력되고, 임피이던스 매칭회로 (1)의 출력은 튜너 후단에 연결되는 중간주파수 증폭회로, 복조회로로 이루어지는 중간주파수 회로(미도시)에 입력되게 된다. 이와 같이 언밸런스 MOPLL IC로 밸런스 출력을 얻기 위해서는 두 개의 MOPLL IC를 병렬로 구성해야 하기 때문에 제조원가가 상승되며, 튜너의 크기가 커지는 문제점이 있다.The unbalanced MOPLL IC1 (2) and MOPLLIC2 (3) have unbalanced outputs input to the impedance matching circuit 1 through the DC cut capacitor C1, respectively, and the output of the impedance matching circuit 1 is connected to the rear end of the tuner. An intermediate frequency amplification circuit and an demodulation circuit are input to an intermediate frequency circuit (not shown). As described above, in order to obtain a balanced output with an unbalanced MOPLL IC, two MOPLL ICs must be configured in parallel, thereby increasing manufacturing costs and increasing the size of the tuner.

본 발명은 이러한 문제점을 해결하기 위한 것으로, 본 발명의 목적은 하나의 언밸런스 MOPLL IC와 분배기를 이용하여 밸런스 출력을 갖는 알에프 수신기의 튜너를 제공함에 있다. The present invention has been made to solve this problem, and an object of the present invention is to provide a tuner of an RF receiver having a balanced output using one unbalanced MOPLL IC and a divider.

상기 목적을 달성하기 위한 본 발명은 하나의 출력을 발생시키는 언밸런스 MOPLL IC; 상기 언밸런스 MOPLL IC의 출력부에서 발생하는 상기 하나의 출력을 제1 출력과 제2출력으로 분배하는 분배기; 상기 제1출력의 임피이던스를 매칭시키는 제1 임피이던스 매칭부; 및 상기 제2출력의 임피이던스를 매칭시키는 제2 임피이던스 매칭부를 포함하고 있다. The present invention for achieving the above object is an unbalanced MOPLL IC for generating one output; A divider for distributing the one output generated at the output of the unbalanced MOPLL IC to a first output and a second output; A first impedance matching unit matching the impedance of the first output; And a second impedance matching unit that matches the impedance of the second output.

이하, 첨부된 도면에 따라서 본 발명의 일실시예를 상세히 설명하기로 한다.Hereinafter, an embodiment of the present invention according to the accompanying drawings will be described in detail.

도 2는 본 발명의 일 실시예의 회로도이다.2 is a circuit diagram of one embodiment of the present invention.

MOPLL IC(10)의 언밸랜스 출력단에는 직류 컷트용 콘덴서(C11)와 분배기(20)가 직렬연결된다. 분배기(20)는 하나의 입력신호를 두 개의 출력으로 분배하기 위한 변압기이고, 분배기(20)에는 분배된 출력을 임피이던스 매칭시키기 위한 임피이던스 매칭부(11), (12)가 각각 연결된다. 임피이던스 매칭부(11), (12)의 출력(Balanced IFOUT 1), (Balanced IFOUT 2)은 외부의 중간주파수 증폭회로, 복조회로등으로 이루어진 중간주파수 회로에 입력된다.The unbalanced output terminal of the MOPLL IC 10 is connected to the DC cut capacitor C11 and the distributor 20 in series. The distributor 20 is a transformer for distributing one input signal to two outputs, and impedance matching units 11 and 12 for impedance matching the distributed output are connected to the distributor 20, respectively. The outputs (Balanced IFOUT 1) and (Balanced IFOUT 2) of the impedance matching units 11 and 12 are input to an intermediate frequency circuit consisting of an external intermediate frequency amplification circuit, a demodulation circuit, and the like.

임피이던스 매칭부(11)는 분배기(20)의 제1출력과 직렬연결된 코일(L11)과 코일(L11)의 출력과 접지사이에 설치되는 콘덴서(C11)로 이루어지며, 임피이던스 매칭부(12)는 분배기(20)의 제2출력과 직렬연결된 코일(L12)과 코일(L12)의 출력과 접지사이에 설치되는 콘덴서(C12)로 이루어진다.The impedance matching unit 11 includes a coil L11 connected in series with the first output of the distributor 20 and a capacitor C11 installed between the output of the coil L11 and the ground, and the impedance matching unit 12 is A coil L12 connected in series with the second output of the distributor 20 and a capacitor C12 installed between the output of the coil L12 and ground.

임피이던스 매칭부(11), (12)는 임피이던스 매칭부를 기준으로 입력측의 임피이던스와 출력측의 임피이던스를 매칭시키는 것으로, 분배기(20) 후단에 설치하는 편이 MOPLL IC(10)와 분배기(20)의 비매칭되는 임피이던스까지도 정합시킬 수 있어 전력이득(Power Gain)의 감소, 튜너 출력의 픽춰, 칼라, 사운드 신호의 레벨이 감소되는 악영향을 방지할 수 있어 분배기 전단에 설치되는 경우에 비하여 바람 직하다.The impedance matching units 11 and 12 match the impedance of the input side with the impedance of the output side based on the impedance matching unit, and it is better to install the rear end of the distributor 20 so that the matching of the MOPLL IC 10 and the distributor 20 is performed. Even impedances can be matched to prevent adverse effects such as reduced power gain, reduced picture of the tuner output, and reduced levels of color and sound signals.

이와 같은 구성의 일실시예의 회로에서 언밸런스 출력을 갖는 MOPLL IC(10)의 출력은 직류 컷트용 콘덴서(C11)를 통과하여 분배기(20)에 입력된다. 분배기(20)에 입력된 신호는 제1, 제2 출력으로 분배되고, 분배된 제1출력은 임피이던스 매칭부(11)를 거쳐 중간주파수 회로에 입력되고, 분배된 제2출력은 임피이던스 매칭부(12)를 거쳐 중간주파수 회로에 입력되어 언밸런스 MOPLL IC(10)로부터 출력되는 언밸런스 출력은 결국 밸런스 출력으로 중간주파수 회로에 입력되게 된다.In the circuit of one embodiment of such a configuration, the output of the MOPLL IC 10 having an unbalanced output is input to the distributor 20 through the DC cut capacitor C11. The signal input to the divider 20 is distributed to the first and second outputs, and the distributed first output is input to the intermediate frequency circuit through the impedance matching unit 11, and the distributed second output is the impedance matching unit ( The unbalanced output inputted to the intermediate frequency circuit through 12) and output from the unbalanced MOPLL IC 10 is eventually input to the intermediate frequency circuit as the balanced output.

상기의 목적과 구성을 갖는 본 발명에 따르면, 하나의 언밸런스 MOPLL IC와 분배기를 이용하여 두 개의 출력을 얻어 밸런스 MOPLL IC의 동작을 구성할 수 있기 때문에 저렴한 비용으로 밸런스 출력을 얻을 수 있다. 또한, 밸런스 출력을 얻기 위하여 언밸랜스 MOPLL IC를 두 개 사용하는 경우에 비하여 튜너의 크기를 소형화할 수 있다.According to the present invention having the above object and configuration, the balanced output can be obtained at low cost since the operation of the balanced MOPLL IC can be configured by obtaining two outputs using one unbalanced MOPLL IC and a divider. In addition, the size of the tuner can be made smaller compared to using two unbalanced MOPLL ICs to obtain a balanced output.

Claims (2)

하나의 출력을 발생시키는 언밸런스 MOPLL IC;An unbalanced MOPLL IC generating one output; 상기 언밸런스 MOPLL IC의 출력부에서 발생하는 상기 하나의 출력을 제1 출력과 제2출력으로 분배하는 분배기;A divider for distributing the one output generated at the output of the unbalanced MOPLL IC to a first output and a second output; 상기 제1출력의 임피이던스를 매칭시키는 제1 임피이던스 매칭부; 및A first impedance matching unit matching the impedance of the first output; And 상기 제2출력의 임피이던스를 매칭시키는 제2 임피이던스 매칭부를 포함하는 알에프 수신기의 튜너. And a second impedance matching unit for matching the impedance of the second output. 제 1항에 있어서,The method of claim 1, 상기 제1 임피이던스 매칭부와 제2 임피이던스 매칭부는 상기 분배기 후단에 설치됨을 특징으로 하는 알에프 수신기의 튜너.And the first impedance matching unit and the second impedance matching unit are installed at a rear end of the distributor.
KR1020060012047A 2006-02-08 2006-02-08 Tuner for radio frequency KR100659324B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR970064475U (en) * 1996-05-14 1997-12-11 Common unit of balanced and unbalanced tuners
KR19990003468U (en) * 1997-06-30 1999-01-25 이형도 Phase noise improvement circuit of 5-volt drive tuner
US6259903B1 (en) 1998-10-05 2001-07-10 U.S. Philips Corporation Tuner and if amplifier
JP2003309777A (en) 2002-04-16 2003-10-31 Alps Electric Co Ltd Television tuner

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR970064475U (en) * 1996-05-14 1997-12-11 Common unit of balanced and unbalanced tuners
KR19990003468U (en) * 1997-06-30 1999-01-25 이형도 Phase noise improvement circuit of 5-volt drive tuner
US6259903B1 (en) 1998-10-05 2001-07-10 U.S. Philips Corporation Tuner and if amplifier
JP2003309777A (en) 2002-04-16 2003-10-31 Alps Electric Co Ltd Television tuner

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