KR940001623Y1 - Input circuit for uhf tuner - Google Patents
Input circuit for uhf tuner Download PDFInfo
- Publication number
- KR940001623Y1 KR940001623Y1 KR2019910011855U KR910011855U KR940001623Y1 KR 940001623 Y1 KR940001623 Y1 KR 940001623Y1 KR 2019910011855 U KR2019910011855 U KR 2019910011855U KR 910011855 U KR910011855 U KR 910011855U KR 940001623 Y1 KR940001623 Y1 KR 940001623Y1
- Authority
- KR
- South Korea
- Prior art keywords
- input
- uhf
- circuit
- tuning
- inductor
- Prior art date
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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
Landscapes
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
내용 없음.No content.
Description
제1도는 종래의 회로 구성도.1 is a conventional circuit configuration diagram.
제2도는 본 고안의 회로 구성도.2 is a circuit diagram of the present invention.
제3도는 입력 주파수의 동조 특성도로서 (a)도는 종래의 특성도이고, (b)도는 개선된 본 고안의 특성도.3 is a tuning characteristic diagram of an input frequency, (a) is a conventional characteristic diagram, (b) is an improved characteristic diagram of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : UHF 입력단 2 : UHF 증폭단1: UHF input stage 2: UHF amplifier stage
10 : 고역통과필터 20 : 트랩회로10: high pass filter 20: trap circuit
VD : 가변용량 다이오드VD: Variable Capacitance Diode
본 고안은 UHF튜너의 입력회로에 관한 것으로, 특히 상호 유도 결합을 이용한 UHF 튜너의 공진입력단인덕터에 공진트랩회로를 구성하여 전밴드에 걸쳐 안정된 Q 값이 일정하게 유지되게 함으로써 입력 정재파비를개선시킨 UHF 튜너의 입력 회로에 관한 것이다.The present invention relates to an input circuit of a UHF tuner. In particular, a resonant trap circuit is formed on a resonant input terminal inductor of a UHF tuner using mutual inductive coupling to improve the input standing wave ratio by maintaining a stable Q value over the entire band. It relates to the input circuit of the UHF tuner.
종래에는 제1도에 도시된 바와같이 UHF 입력단(1)에 고역통과 필터 (10)를 연결하고, 이 고역통과 필터 (10)를 거칭 안테나 신호는 입력 동조 인덕터(L1)와 출력동조 인덕터 (L2)에 의한 단간 동조단을 통해 UHF 증폭단(2)에 접속시킨 구성을 하였다.Conventionally, as shown in FIG. 1, a high pass filter 10 is connected to the UHF input stage 1, and the antenna signal passing through the high pass filter 10 is an input tuning inductor L 1 and an output tuning inductor ( A configuration in which the UHF amplification stage 2 was connected via an inter-step tuning stage by L 2 ) was made.
이와같이 종래의 구성에서 UHF 입력신호는 UHF 입력단(1)과 고역통과 필터 (10)를 거쳐 두 인덕터 (L1) (L2)의 M 결합특성에서 입력동조가 이루어진다.As described above, the UHF input signal is input-tuned in the M coupling characteristic of the two inductors L 1 and L 2 via the UHF input stage 1 and the high pass filter 10.
여기에서, 상기 고역통과필터 (10)는 UHF 대역 신호만 통과시키고 그외 불필요한 신호는 모두 차단시킨다.Here, the high pass filter 10 passes only the UHF band signal and blocks all other unnecessary signals.
그리고, 상기 인덕터 (L1) (L2)의 결함에 따라 주파수 대역내 입력동조가 이루어지며 상기 인덕터 (L2)에 연결된 트리머 인덕터 (L2')로 동조파형을 조정한다.In addition, the inductor (L 1) (L 2) is the input tuning frequency band in accordance with the defect is made to adjust the tuning of the waveform to the trimmer inductor (L 2 ') connected to the inductor (L 2).
그러나, 상기한 종래의 기술은 두 인덕터(L1) (L2)의 M결합만으로 동조가 이루어지므로 사실상 UHF 대역내에 동조를 이루기에는 인덕터 공진회로의 양호도(Quality factor)를 나타내는 Q값이 부족하여 상기 트리머 인덕터 (L2')에 의한 파형조정에 어려움이 따른다.However, the conventional technique described above is performed only by M coupling of two inductors (L 1 ) (L 2 ), so that the Q value indicating the quality factor of the inductor resonance circuit is insufficient for tuning in the UHF band. This is difficult to adjust the waveform by the trimmer inductor (L 2 ').
또한, Q값 부속으로 입력 정재파비 (VSWR)가 나빠지는 문제가 발생한다.In addition, a problem arises in that the input standing wave ratio VSWR deteriorates due to the Q value.
따라서, 본 고안은 상기한 종래의 제반 문제를 해결하기 위하여 안출한 것으로, 본 고안의 목적은 입력 인덕터에 가변 용량 다이오드에 의한 공진 트랩회로를 구성하여 동조전압에 따라 공진트랩 주파수가 이동되게 함으로써, 모든 입력 밴드의 Q값이 균일하게 유지되고, 이에 따라 입력 정재파비가 개선되는 UHF튜너의 입력회로를 제공함에 있다.Therefore, the present invention has been devised to solve the above-mentioned conventional problems, and an object of the present invention is to form a resonant trap circuit by a variable capacitance diode in an input inductor so that the resonant trap frequency is shifted according to the tuning voltage. It is to provide an input circuit of the UHF tuner in which the Q values of all the input bands are kept uniform, thereby improving the input standing wave ratio.
상기한 본 고안의 목적을 달성하기 위한 기술적 구성은, UHF 입력 공진 입덕터와 병렬로 트랩회로를 구성하되, 이 트랩회로를 콘덴서와 가변 용량 다이오드로 구성하고 여기에 동조전압이 인가되게 함으로써 UHF 전체주파수 대역의 Q값 개선에 따른 신호 손실을 방지하고, 입력 정재파비를 개선하도록 한 것을 특징으로 한다.The technical configuration for achieving the above object of the present invention is to configure a trap circuit in parallel with the UHF input resonant inductor, the trap circuit is composed of a capacitor and a variable capacitor diode and the tuning voltage is applied to the entire UHF It is characterized in that the signal loss due to the improvement of the Q value of the frequency band is prevented and the input standing wave ratio is improved.
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.
제2도는 본 고안의 회로도이다.2 is a circuit diagram of the present invention.
UHF 안테나 입력신호를 받는 입력단(1)에 입력신호중 고역 신호만 통과시키는 콘덴서(C1)(C2)와 인덕터(L3)로 구성된 고역통과 필터(10)와, 상기 고역통과필터 (10)에 연결된 상호 유도결합의 입출력동조 인덕터(L1) (L2)와, 상기 입력 동조 인덕터 (L1)에 병렬로 연결된 트랩회로(20)로 구성하되, 상기 트랩회로(20)는 콘덴서(C3)에 바랙터 다이오드(VD)로서 구성하고 상기 콘덴서 (C3)와 가변용량 다이오드(VD)사이 접점에 동조전압단 (VT)을 연결한다.A high pass filter (10) comprising a condenser (C 1 ) (C 2 ) and an inductor (L 3 ) passing only a high pass signal of an input signal to an input terminal (1) receiving an UHF antenna input signal, and the high pass filter (10) Input and output tuning inductor (L 1 ) (L 2 ) of the mutual inductive coupling connected to the trap circuit 20 is connected in parallel to the input tuning inductor (L 1 ), the trap circuit 20 is a capacitor (C) 3 ) is configured as a varactor diode (VD) and the tuning voltage terminal (V T ) is connected to the contact point between the capacitor (C 3 ) and the variable capacitor diode (VD).
상기 출력동조 인덕터 (L2)에는 트리머 콘덴서 (C4)와 트리머 인덕터 (L2')와 UHF 증폭단(2)을 연결한다.A trimmer capacitor C 4 , a trimmer inductor L 2 ′, and a UHF amplifier stage 2 are connected to the output tuning inductor L 2 .
이와같은 구성에서 UHF 입력신호가 입력단(1)을 통해 들어오면 고역통과 필터 (10)에 의해 UHF 대역신호만통과되어 입, 출력 동조 인덕터(L1) (L2)에 의한 상호유도결합(M)에 따라 동조가 이루어져 UHF 증폭단(2)으로출력된다.In this configuration, when the UHF input signal enters through the input stage 1, only the UHF band signal is passed by the high pass filter 10, and the mutual inductive coupling (M 1 ) by the input and output tuning inductors L 1 and L 2 is performed. Tuning is performed and output to the UHF amplifier stage (2).
이때 공진 트랩회로(20)의 가변용량 다이오드(VD)의 용량값이 동조전압단 (VT)의 전압에 따라 변화하게 된다.At this time, the capacitance value of the variable capacitance diode VD of the resonance trap circuit 20 is changed according to the voltage of the tuning voltage terminal V T.
이를 수식으로 표현하면 마음과 같다.This expression is like a mind.
여기서 CVD는 가변용량 다이오드(VD)의 인가전압에 따른 용량이다.Here, C VD is a capacitance according to an applied voltage of the variable capacitance diode VD.
따라서 제3도 (a)와 (b)에서 비교되는 바와같이 기존의 회로에 의한 공진특성 (a)보다 신호손실분(a) 만큼개선된 공진특성 (b)을 얻을 수 있게 되며, 이러한 특성개선, 즉 Q값의 개선은 상기 공진트랩회로(20)가 동조전압을 따라 그 주파수를 이용하게 되므로, 결국 UHF 대역 전체 주파수 특성을 균일하게 유지함으로써 Q값부속으로 인한 입력정재파비의 저하를 개선하게 되는 것이다.Therefore, as shown in FIGS. 3A and 3B, the resonance characteristic (b) improved by the signal loss amount (a) is obtained from the resonance characteristic (a) of the conventional circuit. That is, since the resonance trap circuit 20 uses the frequency according to the tuning voltage, the Q value is improved, so that the overall UHF band frequency characteristics are kept uniform, thereby reducing the decrease in the input standing wave ratio due to the Q value. will be.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019910011855U KR940001623Y1 (en) | 1991-07-26 | 1991-07-26 | Input circuit for uhf tuner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019910011855U KR940001623Y1 (en) | 1991-07-26 | 1991-07-26 | Input circuit for uhf tuner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR930003755U KR930003755U (en) | 1993-02-26 |
| KR940001623Y1 true KR940001623Y1 (en) | 1994-03-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019910011855U KR940001623Y1 (en) | 1991-07-26 | 1991-07-26 | Input circuit for uhf tuner |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR940001623Y1 (en) |
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1991
- 1991-07-26 KR KR2019910011855U patent/KR940001623Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR930003755U (en) | 1993-02-26 |
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