KR910003172Y1 - Input filter circuit for wire tv tuner - Google Patents
Input filter circuit for wire tv tuner Download PDFInfo
- Publication number
- KR910003172Y1 KR910003172Y1 KR2019880010132U KR880010132U KR910003172Y1 KR 910003172 Y1 KR910003172 Y1 KR 910003172Y1 KR 2019880010132 U KR2019880010132 U KR 2019880010132U KR 880010132 U KR880010132 U KR 880010132U KR 910003172 Y1 KR910003172 Y1 KR 910003172Y1
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- South Korea
- Prior art keywords
- pass filter
- tuner
- input
- filter circuit
- filter
- Prior art date
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- 238000010586 diagram Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B7/00—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L37/00—Couplings of the quick-acting type
- F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
- F16L37/12—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members using hooks, pawls or other movable or insertable locking members
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filters And Equalizers (AREA)
Abstract
내용 없음.No content.
Description
제1도는 통상의 유선 TV튜너에서 그 입력 필터회로의 일예도.1 is an example of the input filter circuit in a conventional cable TV tuner.
제2도는 (a),(b)는 제1도의 주파수특성도.2 is a frequency characteristic diagram of FIG.
제3도는 본 고안에 의한 입력필터회로의 실시예도.3 is an embodiment of an input filter circuit according to the present invention.
제4도는 제3도의 주파수입력특성작용을 나타내는 참고도.4 is a reference diagram showing the frequency input characteristic operation of FIG.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 하이 패스 필터 2,3 : 로우패스필터1: high pass filter 2,3: low pass filter
본 고안은 유선 TV튜너에서의 입력필터회로에 관한 것이다.The present invention relates to an input filter circuit in a wired TV tuner.
이러한 기술분야에서 유선 TV튜너는 그 입력필터단에서의 신호처리가 중요히 요구되어지며, 그 신호특성으로는 인터모드(Inter-MOD), 백포크(Backtalk), 리턴-로스(Return-Loss), 입력리케지(Leakage)등이 그필터 양불호(良不好)를 결정케 되어진다.In this technology, the signal processing at the input filter stage is important for the wired TV tuner, and the signal characteristics thereof are inter-mod (MOD), backtalk, and return-loss. , The input lean (Leakage), etc. determine the filter good or bad.
상기 인터모드 특성은 상호변조(Intermodulation) 특성으로, 중첩된 2개 또는 그 이상의 신호가 증폭기외비선형성으로 인하여 상호 승적 성분을 발생하는 현상이다.The intermode characteristic is an intermodulation characteristic, in which two or more superimposed signals generate a mutual multiplier component due to nonlinear amplifier nonlinearity.
즉, 회망파와 불요파가 공존하고 있는 경우 송수신기등의 비선형 특성으로 인하여 각각 주파수의 정수배의 합 또는 차의 주파수 방해파를 말한다.In other words, when the circuit and the undesired wave coexist, the frequency disturbance wave is the sum or difference of integer multiples of the frequency due to the nonlinear characteristics of the transceiver.
상기 백 토크 특성은 라디오나 텔레비젼등의 부조정실에서 스튜디오안에 마이크로폰을 사용하여 연락하는 신호특성이다.The back talk characteristic is a signal characteristic of communicating with a microphone in a studio in a sub-control room such as a radio or a television.
상기 리턴로스는 반사 감쇠량으로서 전기적인 신호를 전송시 전송계에 임피던스의 부정합점이 있으면 이 점에서 전력의 반사가 일어나 입사 전력의 일부가 반사전력이 되는 특성이다.The return loss is a reflection attenuation, and if there is an impedance mismatch in the transmission system when transmitting an electrical signal, power is reflected at this point, and a part of the incident power becomes reflected power.
그러므로, 상기와같은 특성개선을 위해서 일반적으로 제1도와 같은 회로가 사용되어지고, 여기서는 튜닝조건에 따라 튜닝전압이 변화함과 동시에 신호트랩이 가변되도록 하는 형태를 취하고 있다.Therefore, the circuit shown in FIG. 1 is generally used to improve the above characteristics, and in this case, the signal voltage is varied while the tuning voltage is changed according to the tuning conditions.
즉, 제1도에서는 바랙터다이오드(Da,Db)가 트랩기(11, 12)의 코일측으로 가해지는 튜닝전압조건에 따라 주파수트랩조건을 가변토록 되어진다.That is, in FIG. 1, the varactor diodes Da and Db are made to vary the frequency trap condition in accordance with the tuning voltage condition applied to the coil side of the traps 11 and 12. FIG.
또, 여기서는 13은 튜터의 1차국부반진회로에서 혼입될수 있는 불요반진 주파수등을 트랩하는 작용을 하는 트랩회로이다.In addition, 13 is a trap circuit which functions to trap the unnecessary resonance frequency etc. which may be mixed in the tutor's primary local resonance circuit.
그리고, 이러한 과정은 제2도와같이 트랩기(11)에 의한 트랩 포인트 a와 트랩기(12)에 의한 트랩포인트 b가 튜닝과 함께 이동하게 되며, 여기서의 (a)는 튜닝전압이 3V일 경우의 파형도이도, (b)는 튜닝 전압이 20V일 경우의 파형도이다.In this process, as shown in FIG. 2, the trap point a by the trap 11 and the trap point b by the trap 12 are moved together with the tuning, where (a) is when the tuning voltage is 3V. Fig. 2B is a waveform diagram when the tuning voltage is 20V.
그러나, 상기예의 회로에 있어서는 제2도와같이 트랩기(11, 12)에 의한 트랩포인트 a,b 가 동시이동하도록설계되어 있기 때문에 신호의 패스밴드(pass bane)와 리젝션(rejection) 상태가 10-20 dB 정도로 되기 때문에 불요신호가 많이 포함된 상태로 수신케되는 결과를 가져온다.However, in the circuit of the above example, since the trap points a and b by the traps 11 and 12 are designed to move simultaneously as shown in Fig. 2, the pass band and rejection state of the signal are 10. Since it is about -20 dB, the result is that the signal is received with a lot of unnecessary signals.
그리고, 여기서는 튜닝과정에서의 튜너블(Tunable)이 좋지 못하여 그 필터의 백토크, 리턴로스, 리케지등이 항상 문제가 되어 왔던 것이었다.In this case, the tunable during the tuning process was not so good that the backtalk, return loss, and leakage of the filter have always been a problem.
본 고안은 상기와같은 문제점을 개선하고져 안출한 것으로서, 본 고안의 목적은 그 입력필터회로가 하이패스필터및 가변로우패스필터와의 관련구성으로 설계되어 그 필터특성을 양호히 유지토록한 유선 TV튜터의 입력필터회로를 제공함에 있다.The present invention has been made to solve the above problems, and an object of the present invention is to provide a cable TV tutor whose input filter circuit is designed in a related configuration with a high pass filter and a variable low pass filter to maintain the filter characteristics well. An input filter circuit is provided.
상기한 본 고안의 목적을 달성하기 위한 기술적 구성은, 유선 케이블 입력단에 콘덴서와 코일로 이루어진 하이패스 필터가 연결되고, 상기 하이패스 필터의 후단에 트랩기를 통하여 1쌍의 가변 로우패스 필터를 연결하여 유선 TV 튜터의 입력신홀 특성을 개선하도록 한것을 특징으로 한다.The technical configuration for achieving the above object of the present invention, a high-pass filter consisting of a capacitor and a coil is connected to the wired cable input terminal, by connecting a pair of variable low-pass filter through a trap to the rear end of the high-pass filter It is characterized by improving the input new hall characteristic of the cable TV tutor.
이하에서 이를 좀 더 상세히 설명하면 다음과 같다.This will be described in more detail below.
제2도는 본 고안에 의한 필터회로를 나타내었다.2 shows a filter circuit according to the present invention.
여기서는 케이블 입력단으로부터 코일(L1)과 콘덴서(C1)(C2)로 구성된 하이패스필터(1)가 연결되어지고 트랩기(4)를 거쳐 바랙터다이오드(21,31)를 포함한 가변로우패스필터부(2,3)가 연결되어 진다.Here, from the cable input, a high pass filter 1 consisting of a coil L 1 and a condenser C 1 (C 2 ) is connected and a variable low including varactor diodes 21 and 31 via a trap 4. The pass filter parts 2 and 3 are connected.
상기 가변 로우패스 필터부(2)는 코일(L2)(L3)에 콘덴서(C3)와 바랙터 다이오드(21)를 병렬로 연결하여 구성하고, 상기 가변 로우패스필터(3)는 코일(L3)(L4)에 콘덴서(C4)와 바랙터다이오드(31)를 병렬로 연결하여 구성 한다.The variable low pass filter 2 is configured by connecting a capacitor C 3 and a varactor diode 21 in parallel to the coils L 2 and L 3 , and the variable low pass filter 3 is a coil. Condenser (C 4 ) and varactor diodes 31 are connected in parallel to (L 3 ) (L 4 ).
상기 로우패스필터부(2,3)의 바랙터다이오드(21,31)측에는 튜닝 전압(VT)이 가해지도록 회로결선되어 진다.The low pass filter parts 2 and 3 are circuit-connected so that the tuning voltage VT is applied to the varactor diodes 21 and 31 side.
이러한 구성의 본 고안에 있어서는 케이블입력측의 하이패스필터(1)에선 입력신호중 약 50 MHz 범위의 하이패스필터로 되므로서 50 MHz 범위의 고주파성분이 걸러진다.In the present invention having such a configuration, the high pass filter 1 on the cable input side becomes a high pass filter in the range of about 50 MHz among the input signals, thereby filtering out the high frequency component in the 50 MHz range.
상기 하이패스필터(1)를 통과한 고주파 성분은 트랩기(4)를 거쳐 로우패스필터(2)에 인가된다.The high frequency component passing through the high pass filter 1 is applied to the low pass filter 2 via the trap 4.
이후 가변로우괘스필터(2,3)측에서는 튜팅조작에 따른 튜닝전압(VT)이 바랙터 다이오드(21)(31)에 의하여 가변될 때 제4도와 같이 로우패스필터로서 가변되므로서 그 튜팅 전압변화시의 감쇄비가 좋아지고 백토크성분도 없게되며, 불요신호의 수신상태가 줄여지는 것이고, 또 인터-모드나 튜터에의 1차 국부발진기에서 나오는리케지도 양호히 제거케 되어진다.Then, when the tuning voltage VT according to the tuning operation is varied by the varactor diodes 21 and 31, the variable low ruler filters 2 and 3 are changed as low pass filters as shown in FIG. The attenuation ratio of the city is improved, there is no backtalk component, the reception of the unnecessary signal is reduced, and the leakage from the primary local oscillator to the inter-mode or tutor is well removed.
이러한 본 고안은 유선 TV 튜터의 입력필터가 하이패스필터와 가변로우패스 필터와의 관련구성으로 되어 그 필터특성을 양호히 개선케 되어지는 유익한 특징이 있는 것이다.This invention has an advantageous feature that the input filter of the cable TV tutor is associated with the high pass filter and the variable low pass filter to improve the filter characteristics.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019880010132U KR910003172Y1 (en) | 1988-06-28 | 1988-06-28 | Input filter circuit for wire tv tuner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019880010132U KR910003172Y1 (en) | 1988-06-28 | 1988-06-28 | Input filter circuit for wire tv tuner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR900001771U KR900001771U (en) | 1990-01-19 |
| KR910003172Y1 true KR910003172Y1 (en) | 1991-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019880010132U KR910003172Y1 (en) | 1988-06-28 | 1988-06-28 | Input filter circuit for wire tv tuner |
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| Country | Link |
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| KR (1) | KR910003172Y1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006025670A1 (en) * | 2004-08-30 | 2006-03-09 | Fci Inc. | Voltage-controlled oscillator using lc resonator |
-
1988
- 1988-06-28 KR KR2019880010132U patent/KR910003172Y1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006025670A1 (en) * | 2004-08-30 | 2006-03-09 | Fci Inc. | Voltage-controlled oscillator using lc resonator |
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| Publication number | Publication date |
|---|---|
| KR900001771U (en) | 1990-01-19 |
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