KR960008159Y1 - Band width switching circuit for receiving tuner - Google Patents

Band width switching circuit for receiving tuner

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Publication number
KR960008159Y1
KR960008159Y1 KR2019930025192U KR930025192U KR960008159Y1 KR 960008159 Y1 KR960008159 Y1 KR 960008159Y1 KR 2019930025192 U KR2019930025192 U KR 2019930025192U KR 930025192 U KR930025192 U KR 930025192U KR 960008159 Y1 KR960008159 Y1 KR 960008159Y1
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KR
South Korea
Prior art keywords
tuning
circuit
tuner
band
signal
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KR2019930025192U
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Korean (ko)
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KR950015841U (en
Inventor
류태규
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삼성전기 주식회사
윤종용
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Priority to KR2019930025192U priority Critical patent/KR960008159Y1/en
Publication of KR950015841U publication Critical patent/KR950015841U/en
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Publication of KR960008159Y1 publication Critical patent/KR960008159Y1/en

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/16—Tuning without displacement of reactive element, e.g. by varying permeability
    • H03J3/18—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance
    • H03J3/185—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance with varactors, i.e. voltage variable reactive diodes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
    • H03J5/242—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
    • H03J5/244—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection using electronic means
    • 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
    • H04N7/00—Television systems
    • H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite

Abstract

요약없음No summary

Description

위성방송 수신튜너 동조회로의 밴드폭 절환회로Bandwidth Switching Circuit of Satellite Broadcast Tuning Tuning Circuit

첨부도면은 본 고안의 실시예를 도시한 회로도이다.The accompanying drawings are circuit diagrams illustrating embodiments of the present invention.

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

1 : 입력단2 : 출력단1: Input 2: Output

VS/W: 광역/협역 스위칭 전원C1∼C4: 콘덴서V S / W : Wide / Narrow Switching Power Source C 1 ~ C 4 : Condenser

D1: 바렉터 다이오드L1, L2: 인덕터D 1 : varistor diode L 1 , L 2 : inductor

본 고안은 위성 방송을 수신하는 BS 튜너에 관한 것으로, 특히 BS 튜너의 듀얼밸드(Dual Band)에서 밴드 전환시 발생하는 노이즈를 제거하기 위한 동조회로의 밴드 전환회로에 관한 것이다.The present invention relates to a BS tuner for receiving satellite broadcasts, and more particularly, to a band switching circuit of a tuning circuit for removing noise generated when switching a band in a dual band of a BS tuner.

통상적으로 위성방송은 적도상공의 정지위성에서 초고주파의 전파를 발생하면, 상기 위성 방송신호는 옥외에 설치된 파라볼라 안테나로 수신되며, 상기 수신된 위성방송 신호는 LNB에서 UHF 밴드의 주파수로 변환된다.In general, when satellite broadcasting generates very high frequency radio waves at a stationary satellite over the equator, the satellite broadcasting signal is received by a parabolic antenna installed outdoors, and the received satellite broadcasting signal is converted into a frequency of the UHF band at the LNB.

상기 변환신호는 동축 케이블을 통해 옥내의 위성 방송 수신 BS튜너에 전달되며, 상기 BS 튜너에서는 UHF 밴드의 고주파 신호를 중간주파수(IF)로 변환하여 FM 복조회로를 통해 베이스 밴드 신호로 출력된다.The converted signal is transmitted to an indoor satellite broadcast receiving BS tuner through a coaxial cable, and the BS tuner converts a high frequency signal of the UHF band into an intermediate frequency (IF) and outputs the baseband signal through an FM demodulation circuit.

상기 BS 튜너의 일반적인 기술은 다음과 같다.The general description of the BS tuner is as follows.

안테나로 부터 입력되는 고주파 신호를 1차 고주파 증폭기에서 증폭한후 감쇄기를 통해 1차로 감쇄시킨다.The high frequency signal input from the antenna is amplified by the first high frequency amplifier and then attenuated first through the attenuator.

상기 감쇄된 고주파신호는 입력동조 필터에서 동조된후 2차 고주파 증폭기에서 2차로 증폭된 다음 2차 감쇄기에서 2차로 감쇄된다.The attenuated high frequency signal is tuned by an input tuning filter, amplified second by a second high frequency amplifier, and then attenuated second by a second attenuator.

상기 2차 감쇄된 고주파 신호는 3차 고주파 증폭기에서 3차로 증폭된 후 혼합기에서 국부 발진신호와 함께 혼합되어 중간 주파수(IF)로 만들어진다.The second attenuated high frequency signal is amplified in the third order in the third high frequency amplifier and then mixed with the local oscillation signal in the mixer to make the intermediate frequency IF.

상기 혼합기에서 출력된 중간주파 신호는 단간동조회로에서 불필요한 노이즈 성분을 제거하여 각종 비트(Beat) 특성을 향상시키게 된다.The intermediate frequency signal output from the mixer improves various beat characteristics by removing unnecessary noise components from the inter-stage tuning circuit.

그러나 종래에 단간동조 필터는 광역 밴드(Wide Band)에 고정된 것으로서 듀얼밴드(Dual Band)에서 협력 밴드(Narrow Band)로 스위칭시 광역 밴드에 필요한 밴드폭(BW)을 갖고 있기 때문에 협역 밴드의 경우에는 광역밴드의 스위칭시 만큼의 특성향상을 꾀하기 어려운 문제가 있다.However, in the case of a narrow band, a single inter-tuning filter is fixed to a wide band and has a bandwidth required for a wide band when switching from a dual band to a narrow band. There is a problem that it is difficult to improve the characteristics as much as the switching of the wide band.

따라서, 본고안은 상기한 종래의 문제점을 해결하기 위하여 안출한 것으로, 본고안의 목적은 듀얼밴드 BS 튜너에서 협역/광역(Narrow/Wide) 밴드에 관계없이 광역밴드에 맞도록 고정설게된 단간동조회로를 밴드에 따라 패스밴드(pass Band)가 가변되도록 하여 패스밴드 이외의 노이즈 성분을 효과적으로 제거하여 각종 비트특성을 향상시키는 위성수신기 동조 회로의 밴드폭 전환회로를 제공함에 있다.Therefore, the present invention has been devised to solve the above-mentioned problems. The purpose of this paper is to provide a simple intermittent tuning circuit that is fixed to a wide band regardless of narrow / wide bands in a dual band BS tuner. The present invention provides a bandwidth switching circuit of a satellite receiver tuning circuit that improves various bit characteristics by effectively eliminating noise components other than the pass band by varying a pass band according to a band.

상기한 본 고안의 목적을 달성하기 위한 기술적인 구성은, 위성방송 수신튜너의 밴드폭 절환회로에 있어서, 상기 위성방송 수신튜너의 혼합기로 부터 중간주파 신호를 입력받아 동조하여 그 동조된 신호를 출력하는 제1동조 회로와, 상기 제1동조회로에서 출력되는 동조신호에 동조하여 그 동조된 신호를 출력하는 제2동조회로와, 상기 제1및 제2동조회로 사이에 연결되어 그 캐피시턴스 값에 따라 상기 제1 및 제2동조회로의 커플링을 변화시키며 그 바이어스 전압에 따라 정전용량값이 변화되는 바렉터 다이오드와, 상기 바렉터 다이오드의 양단에 연결되는 제1 및 제2저항으로 구성되며, 상기 광역/협역 스위칭 전원과 접지 사이에 연결되어 바이어스 전압을 공급하는 바이어스부로 구성된다.The technical configuration for achieving the above object of the present invention, in the bandwidth switching circuit of the satellite broadcast receiving tuner, receives the intermediate frequency signal from the mixer of the satellite broadcast receiving tuner, and tunes and outputs the tuned signal. A first tuning circuit, a second tuning circuit for tuning in response to a tuning signal output from the first tuning circuit, and outputting the tuned signal, and a capacitance thereof connected between the first and second tuning circuits. A varistor diode whose coupling of the first and second tuning circuits is changed according to a value and whose capacitance is changed according to its bias voltage, and first and second resistors connected to both ends of the varactor diode. And a bias unit connected between the wide / narrow switching power supply and ground to supply a bias voltage.

이하 첨부된 도면에 의하여 본 고안의 바람직한 실시예를 상세히 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

첨부도면은 본고안의 실시예를 도시한 것이다.The accompanying drawings show embodiments of the present disclosure.

입력단(1)에는 혼합기(도시되지 않음)에서 출력된 중간주파 신호가 들어온다. 상기 입력단(1)에는 커플링 콘덴서(C1)가 연결되고 이어서 바렉터 다이오드(D1)가 연결된다.The input terminal 1 receives an intermediate frequency signal output from a mixer (not shown). A coupling capacitor C 1 is connected to the input terminal 1, followed by a varistor diode D 1 .

상기 커플링 콘덴서(C1)와 바렉터 다이오드(D1)사이에는 병렬로 콘덴서(C3)를 연결함과 아울러 저항(R1)을 연결하여 접지시킨다.A capacitor C 3 is connected in parallel between the coupling capacitor C 1 and the varactor diode D 1 , and a resistor R 1 is connected to ground.

상기 콘덴서(C3)에는 인덕터(L1)를 연결하여 접지시킨다.An inductor L 1 is connected to the capacitor C 3 to ground.

상기 바렉터 다이오드(D1)의 출력단에는 커플링 콘덴서(C2)를 연결하여 중간주파 출력단(2)에 연결하며, 상기 출력단(2)은 중간주파 신호를 증폭해 주는 중간주파 증폭기(도시하지 않음)와 연결된다.A coupling capacitor C 2 is connected to the output terminal of the varactor diode D 1 and connected to the intermediate frequency output terminal 2, and the output terminal 2 is an intermediate frequency amplifier for amplifying the intermediate frequency signal (not shown). Not connected).

상기 바렉터 다이오드(D1)의 출력단과 커플링 콘덴서(C2) 사이에는 병렬로 저항(R2)을 통해 광역/협역 스위칭전원(Vs/w)을 연결하고 동시에 콘덴서(C4)를 연결하여 인덕터(L2)를 통해 접지시킨다.The wide / narrow switching power supply (V s / w ) is connected between the output terminal of the varactor diode (D 1 ) and the coupling capacitor (C 2 ) in parallel through a resistor (R 2 ) and simultaneously the capacitor (C 4 ) is connected. To ground through the inductor (L 2 ).

여기에서 상기 저항(R1)(R2)은 상기 바렉터 다이오드(D1) 양단의 전위를 결정해 주기위한 저항이고, 콘덴서(C1)와 인덕터(L1)는 제1동조회로를 구성하며, 콘덴서(C4)와 인덕터(L2)는 제2동조회로를 구성함으로써 복동조회로를 구성한다.Here, the resistor R 1 (R 2 ) is a resistor for determining the potential across the varactor diode D 1 , and the capacitor C 1 and the inductor L 1 constitute a first tuning circuit. The capacitor C 4 and the inductor L 2 constitute a double tuning circuit by forming a second tuning circuit.

이때 상기 바렉터 다이오드(D1)가 갖는 캐패시턴스는 상기 제1 및 제2동조회로(C3)(L1)(C4)(L2)의 커플링을 결정하는 요소로서 상기 바렉터 다이오드(D1)의 캐패시턴스가 커지면 상기 제1 및 제2동조회로의 커플링이 많게 되어 광역 밴드(Wide Band)가 되고, 상기 바렉터 다이오드(D1)의 캐패시턴스가 작아지면 상기 제1 및 제2동조회로의 커플링 작게되어 협역 밴드(Narrow Band)가 된다.In this case, the capacitance of the selector diode D 1 is an element that determines the coupling of the first and second tuning circuits C 3 , L 1 , C 4 , and L 2 . When the capacitance of (D 1 ) increases, the coupling of the first and second tuning circuits increases, resulting in a wide band, and when the capacitance of the selector diode D 1 decreases, the first and second Coupling of the tuning circuit is small and becomes a narrow band.

이와같이 상기 바렉터 다이오드(D1)의 캐패시턴스 용량에 따라 복동조회로의 밴드폭(Band Width)이 줄어드는 특성을 갖고 있는 점을 이용하여 광역/협역 밴드의 스위칭시 광역/협역 스위칭 전원(VS/W)을 상기 바렉터 다이오드(D1)에 인가하여 상기 바렉터 다이오드(D1)의 캐패시턴스 용량을 변화시켜준다.As described above, the band width of the double-tuning circuit decreases according to the capacitance of the varistor diode D 1 , so that the wide / narrow switching power supply (V S / applying a W) to the varactor diode (D 1) to give by changing the capacitance of the varactor capacitance diode (D 1).

그러므로 원하는 패스밴드(Pass Band)를 가변시켜준다.Therefore, the desired pass band can be varied.

따라서, 18MHz/2MHz의 밴드 스위칭시 18MHz에서는 상기 광역/협역 스위칭 전원(VS/W)의 전압을 12V로 하고, 27MHz에서는 상기 광역/협역 스위칭전원(VS/W)의 전압을 0V로 한다.Therefore, in 18 MHz / 2 MHz band switching, the voltage of the wide / narrow switching power supply (V S / W ) is 12 V at 18 MHz, and the voltage of the wide / narrow switching power supply (V S / W ) is 0 V at 27 MHz. .

이와 같이 18MHz 12V가 가해지면 상기 바렉터 다이오드(D1)의 역전압이 증가되어 캐패시턴스 값이 낮아지고, 상기 캐패시턴스값이 낮아지면 커플링이 작게 되어 패스밴드가 좁아진다.As such, when 18 MHz 12 V is applied, the reverse voltage of the varactor diode D 1 is increased to lower the capacitance value. When the capacitance value is lower, the coupling becomes smaller and the passband is narrower.

반대로, 27MHz 시 0V가 가해지면 상기 바렉터 다이오드(D1)의 역전압이 작게되어 캐패시턴스 값이 높아지고, 상기 캐패시턴스 값이 높아지면 커플링이 크게 되어 패스밴드가 넓어진다.On the contrary, when 0 V is applied at 27 MHz, the reverse voltage of the varactor diode D 1 is decreased to increase the capacitance value, and when the capacitance value is increased, the coupling becomes large and the pass band is widened.

이와같이 상기 광역/협역스위칭 전원(VS/W)의 스위칭 전압 변동에 따라 패스밴드를 가변시킴으로써 광역밴드 스위칭시는 물론 협역밴드 스위칭시에도 여러가지 불필요한 노이즈 성분이 효과적으로 제거되어 인접 채널간 리젝션 비율(Rejection Ratio)이 향상되는등 각종 비트 특성이 대폭 향상되는 유익한 장점이 있다.As such, by varying the passband according to the switching voltage variation of the wide / narrow switching power supply (V S / W ), various unnecessary noise components are effectively removed during wide band switching and narrow band switching, so that the rejection ratio between adjacent channels ( Various bit characteristics are greatly improved, such as an improved rejection ratio.

Claims (1)

위성방송 수신튜너의 밴드폭 절환회로에 있어서, 상기 위성방송 수신튜너의 혼합기로 부터 중간주파 신호를 입력받아 동조하여 그 동조된 신호를 출력하는 제1동조 회로와, 상기 제1동조 회로에서 출력되는 동조신호에 동조하여 그 동조된 신호를 출력하는 제2동조회로와, 상기 제1 및 제2동조회로 사이에 연결되어 그 캐패시턴스 값에 따라 상기 제1및 제2동조회로의 커플링을 변화시키며 그 바이어스 전압에 따라 정전 용량값이 변화되는 바렉터 다이오드와, 상기 바렉터 다이오드의 양단에 연결되는 제1 및 제2저항으로 구성되며, 상기 광역/협역 스위칭 전원과 접지 사이에 연결되어 바이어스 전압을 공급하는 바이어스부로 구성되는 것을 특징으로 하는 위성방송튜너 동조회로의 밴드폭 절환회로.A bandwidth switching circuit of a satellite broadcasting reception tuner, comprising: a first tuning circuit which receives an intermediate frequency signal from a mixer of the satellite broadcasting receiving tuner, tunes it, and outputs the tuned signal; and is output from the first tuning circuit. A second tuning circuit that tunes to the tuning signal and outputs the tuned signal, and is coupled between the first and second tuning circuits to change the coupling of the first and second tuning circuits in accordance with its capacitance value; And a varistor diode whose capacitance changes according to the bias voltage, and first and second resistors connected to both ends of the varactor diode, and connected between the wide / narrow switching power supply and ground to obtain a bias voltage. Bandwidth switching circuit of the satellite broadcasting tuner tuning circuit, characterized in that the bias section for supplying.
KR2019930025192U 1993-11-26 1993-11-26 Band width switching circuit for receiving tuner KR960008159Y1 (en)

Priority Applications (1)

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KR2019930025192U KR960008159Y1 (en) 1993-11-26 1993-11-26 Band width switching circuit for receiving tuner

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KR2019930025192U KR960008159Y1 (en) 1993-11-26 1993-11-26 Band width switching circuit for receiving tuner

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KR950015841U KR950015841U (en) 1995-06-19
KR960008159Y1 true KR960008159Y1 (en) 1996-09-24

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KR100409149B1 (en) * 2001-12-26 2003-12-06 파츠닉(주) Vhf tuning circuit of television tuner

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