KR890007396Y1 - Electronic tuner - Google Patents
Electronic tuner Download PDFInfo
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- KR890007396Y1 KR890007396Y1 KR2019820010612U KR820010612U KR890007396Y1 KR 890007396 Y1 KR890007396 Y1 KR 890007396Y1 KR 2019820010612 U KR2019820010612 U KR 2019820010612U KR 820010612 U KR820010612 U KR 820010612U KR 890007396 Y1 KR890007396 Y1 KR 890007396Y1
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Classifications
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- 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
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- 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
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- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Superheterodyne Receivers (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Noise Elimination (AREA)
Abstract
내용 없음.No content.
Description
제1(a)도는 종래의 전자 동조 튜너의 1예의 회로구성도.Fig. 1 (a) is a circuit diagram of an example of a conventional electronic tuning tuner.
제1(b)도는 제1(a)도의 밴드 마다의 각단자 전압의 1예를 나타낸 도면.FIG. 1 (b) is a diagram showing one example of the terminal voltages for each band in FIG. 1 (a).
제1(c)도는 제1(a)도의 VHF입력회로의 1예의 회로도.FIG. 1 (c) is a circuit diagram of one example of the VHF input circuit of FIG. 1 (a).
제2도 제3도는 각각 본 고안의 전자 동조 튜터의 각 실시예의 회로구성도이다.2 is a circuit diagram of each embodiment of the electronic tuning tutor of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
11 : 전자동조튜너 1V : VHF튜너회로11: fully tuned tuner 1V: VHF tuner circuit
1U : UHF튜너회로 2 : 입력회로1U: UHF tuner circuit 2: Input circuit
2b : 입력동조회로 D1, D2: 스위칭 다이오드2b: input tuning circuit D 1 , D 2 : switching diode
LB : 저역(low band)전용의 스위칭용 전압단자 HB : (high band)전용의 스위치용 전압단자.LB: Low voltage switching voltage terminal. HB: High voltage switching voltage terminal.
TU : 동조전압단자 UB : UHF 전압단자.TU: Tuning voltage terminal UB: UHF voltage terminal.
본 고안은 전자 동조 튜너에 관한 것이며 UHF 수신시에 방해 VHF전파가 고차 왜곡파를 발생하지 않도록 한 전자동조튜너에 관한 것이다.The present invention relates to an electronic tuning tuner and to an electronic tuning tuner such that the disturbing VHF propagation does not generate a higher order distortion wave when receiving a UHF.
제1(a)도에 나타낸 종래의 전자동조튜너(1)은 대략VHF튜너회로(V)와 UHF튜너회로(1U)로 구성되어 있다.The conventional fully tuned tuner 1 shown in FIG. 1 (a) is composed of approximately the VHF tuner circuit V and the UHF tuner circuit 1U.
VHF튜너회로(1V)는필터회로(2a)와 입력동조회로(2b)로 이루어진 입력회로(2)복동조회로를 가진 고주파 증폭회로(3) 혼합회로(4) 및 국부발진회로(5)등으로 이루어져 있다.The VHF tuner circuit 1V is a high frequency amplification circuit 3 having an input circuit 2 demodulation circuit consisting of a filter circuit 2a and an input tuning circuit 2b, a mixing circuit 4 and a local oscillation circuit 5 Etc.
UHF튜너회로(1U)는 고주파 증폭회로(6)혼합회로(7) 및 국부발진회로(8)로 이루어져 있다.The UHF tuner circuit 1U consists of a high frequency amplification circuit 6, a mixing circuit 7 and a local oscillation circuit 8.
MB단자는 혼합회로(4)의 전압단자, LB단자는 VHF저역(1~3ch)수신시에 혼합회로(4)를 제외한 회로(2)(3)(5)의 동조회로에 소정의 전압을 인가하는 저역 전용의 스위치용 전압단자, HB단자는 VHF 고역(4~12ch) 혼합회로(4)를 제외한 회로(2)(3)(5)의 동조회로에 소정전압을 인가하는 고역전용의 스위치용 전압단자이다.The MB terminal provides the voltage terminal of the mixed circuit 4, and the LB terminal supplies a predetermined voltage to the tuning circuits of the circuits 2, 3 and 5 except for the mixed circuit 4 at the time of receiving the VHF low pass (1 to 3 ch). The low voltage dedicated switch voltage terminal and the HB terminal applied high voltage switch for applying a predetermined voltage to the tuning circuits of the circuits 2, 3 and 5 except for the VHF high frequency (4 to 12 ch) mixing circuit 4 Is a voltage terminal.
UB단자는 UHF수신시의 UHF튜너회로(1U)내의 각 회로(6)(7)(8)의 전압단자이다.The UB terminal is a voltage terminal of each of the circuits 6, 7 and 8 in the UHF tuner circuit 1U at the time of UHF reception.
TU단자는 VHF튜너회로(1V)와 UHF튜너회로(1U)에 공통의 동조전압 단자이며 다른 단자가 제1(b)도에 나타낸 일정한 전압값을 취하는 것에 대하여 선국(선局) 채널마다 다른전압이 인가된다.The TU terminal is a tuning voltage terminal common to the VHF tuner circuit (1V) and the UHF tuner circuit (1U), and differs for each channel selected for the other terminal taking a constant voltage value shown in FIG. 1 (b). Is applied.
여기서 입력회로(2)는 구체적으로는 제1(c)에 나타낸 회로구성으로 되어있다.Here, the input circuit 2 has the circuit structure shown to 1st (c) specifically.
필터회로(2a)는 텔레비젼 전파주파수대 이외의 방해파를 제거하기 위한 회로이다.The filter circuit 2a is a circuit for removing interference waves other than the television radio frequency band.
입력동조회로(2b)는 완만한 단봉형 특성을 가지며 고주파 증폭회로(3)의 쌍봉형(쌍봉刑)특성과 총합에 의해 영상으로부터 음성까지 똑같이 증폭되도록 하고 있다.The input tuning circuit 2b has a gentle unimodal characteristic and is equally amplified from video to audio by the sum of the bimodal characteristics and the sum of the high frequency amplification circuit 3.
본 예의 경우 입력동조회로(2b)는 가변용량 다이오드(D)를 사용하여 동조주파수를 전자절환하는 구성이지만 동조범위가 넓기때문에 2개의 스위칭다이오드(D1)(D2)를 사용하는 VHF저역수신시와 VHF고역수신시에 사용하는 동조코일 L1∼L5의 조합과 접속상태를 다르게 하고 있다.In this example, the input tuning circuit 2b uses the variable capacitance diode D to electronically switch the tuning frequency. However, since the tuning range is wide, the VHF low band using two switching diodes D 1 and D 2 is used. The combination and connection state of the tuning coils L 1 to L 5 used at the time of reception and at the time of VHF high frequency reception are different.
즉VHF저역 수신시에는 LB단자에 인가된 전압에 의해 스위칭 다이오드(D1)(D2)를 역방향으로 바이어스 함에따라 코일(L2)을 전송로로부터 절리하고 코일(L3)이 코일(L1)과 코일(L4)의 접속점과 어스사이에 접속된 상태로 한다.That is, in the case of VHF low pass reception, the coil L 2 is cut off from the transmission path by biasing the switching diode D 1 (D 2 ) in the reverse direction by the voltage applied to the LB terminal, and the coil L 3 is coil L 3 . and in a state of being connected between the first) and the connection point to the earth of the coils (L 4).
또 VHF고역 수신시에는 HB단자간에 인가된 전압에 의해 스위칭 다이오드(D1),(D2)를 순방향으로 바이어스함으로써 코일(L3)과(L4)의 직렬접속회로의 코일(D3)에 코일(D2)이 병렬 접속된 상태로 한다.In the VHF high-frequency reception, the coil D 3 of the series connection circuit of the coil L 3 and L 4 is biased forward by biasing the switching diodes D 1 and D 2 by the voltage applied between the HB terminals. The coil D 2 is connected in parallel.
이와같이 상기 종래의 전자동조 튜너(1)는 VHF안테나 단자에 접속된 입력회로(2)내의 스위칭 다이오드(D1)(D2)를 VHF수신시에 밴드마다 절환하도록 하고 있다.As described above, the conventional fully tuned tuner 1 switches the switching diode D 1 (D 2 ) in the input circuit 2 connected to the VHF antenna terminal for each band at the time of VHF reception.
그렇지만 UHF수신에 관하여 설명하면 LB단자도 HB단자도 인가전압이 "0"이기때문에 상기 스위칭다이오드(D1)(D2)는 외부로부터 완전히 바이어스가 걸리지않은 상태로 방치된다.However, when the UHF reception is described, since the LB terminal and the HB terminal have an applied voltage of "0", the switching diode D 1 (D 2 ) is left unbiased from the outside.
이때문에 VHF전파의 강전계(强電界)지역등에서는 스위칭 다이오드(D1)(D2)의 비직선 왜곡파는 고주파 증폭회로(3)의 이중게이트 전계효과 트랜지스터(TR)의 게이트까지 인가된다.For this reason, nonlinear distortion waves of the switching diodes D 1 and D 2 are applied to the gate of the double gate field effect transistor TR of the high frequency amplification circuit 3 in the strong electric field of the VHF electric wave. .
특히 이라한 종류의 고차 왜곡파는 UHF대에 있어서는 해로운 방해전파이며 UHF수신시에 이 방해 전파가 혼신하여 화상에 비트나 웨이퍼등의 장해가 나타나는 결점이 있었다.In particular, this kind of high-order distortion wave is a harmful interference wave in the UHF band, and when the UHF reception receives this interference wave, there is a drawback that a bit or a wafer is disturbed in the image.
본 발명의 목적은 상기 결점을 제거한 것으로서. VHF 튜너회로의밴드 절환용의 스위칭 다이오드를 UHF수신시에 UHF튜너회로에 공급하는 전압에 의해 강제적으로 바이어스 시키는 구성으로 이러한 구성에 따라 VHF안테나 단자에 강전계의 VHF전파가 들어와도 상기 스위칭 다이오드의 비직선 왜곡에 의한 고차 왜곡파가 발생하지 않는 전자동조튜너를 제공하는 것이다.The object of the present invention is to eliminate the above drawbacks. The switching diode for band switching of the VHF tuner circuit is forcibly biased by the voltage supplied to the UHF tuner circuit at the time of UHF reception. According to this configuration, even when the VHF propagation of the strong electric field enters the VHF antenna terminal, It is to provide a fully tuned tuner that does not generate higher-order distortion waves due to linear distortion.
이하 제2도 이하를 참조하여 본 고안의 1실시예에 관하여 설명한다.Hereinafter, an embodiment of the present invention will be described with reference to FIG. 2.
제2도는 본 고안의 전자동조튜너의 1실시예의 회로구성도를 나타낸다.2 is a circuit diagram of one embodiment of the fully tuned tuner of the present invention.
제2도중 제1(a)도와 동일구성부에는 동일부호를사용한다.In Fig. 2, the same reference numerals are used for the same components as in Fig. 1 (a).
제2도중 전자동조 튜너(11)는 VHF입력동조 회로(2b)와 LB단자를 연결하는 전압라인(12)에 다이오드(D3)를 개재시켜 UB단자를 접속하고 다이오드(D3)를 개재시킨 UB단자로부터의 전압이 고주파 증폭회로(3)난 국부발진회로(5)에 인가되지 않도록 하기위하여 다이오드(D4)를 설치하고 있다.The second tuning tuner 11 connects the UB terminal via a diode D 3 to a voltage line 12 connecting the VHF input tuning circuit 2b and the LB terminal, and interposes the diode D 3 . In order to prevent the voltage from the UB terminal from being applied to the local oscillation circuit 5 or the high frequency amplification circuit 3, a diode D 4 is provided.
따라서 UHF수신시에는 VHF입력동조회로(2b)내의 스위칭 다이오드(D1)(D2)는 UB단자로부터의 전압에 의해 역방향으로 바이어스되고, 입력회로(2)만은 마치 저역 수신시와 같은 상태가 된다.Therefore, at the time of UHF reception, the switching diode D 1 (D 2 ) in the VHF input tuning circuit 2b is biased in the reverse direction by the voltage from the UB terminal, and only the input circuit 2 is in the same state as in the low frequency reception. Becomes
이때문에 스위칭 다이오드(D1)(D2)는 역방향으로 바이어스되고 있기 때문에 설령 강전계 지역에 있다고 하더라도 비직선 왜곡에 의거한 고차 왜곡파를 발생하지 않고 UHF화면에 VHF의 방해파가 비트나 웨이퍼등의 장해를 발생시키지 않는다.Because of this, the switching diodes (D 1 ) and (D 2 ) are biased in the reverse direction, so even if they are in a strong electric field, they do not generate higher-order distortion waves based on nonlinear distortion, and the VHF disturbance waves appear on the UHF screen. It does not cause the obstacle.
또 전압라인(12)과 UB단자의 접속개소를 예를들면 제2(c)도에 나타낸 다이오드(D40)의 캐소드측으로 함으로써 다이오드((D4)는 생략할 수 있다.In addition, the diode (D 4 ) can be omitted by setting the connection point of the voltage line 12 and the UB terminal to the cathode side of the diode D 40 shown in FIG. 2 (c), for example.
그리고 상기 실시예의 UHF수신시에 입력회로(2)를 마치VHF저역 수신시와 같은 상태로 하도록 했지만 제3도에 나타낸 전자동조 튜너(21)과 같은 UHF수신시에 입력회로(2)가 마치 VHF고역 수신시와 같은 상태로 되도록 UB단자와 HB단자를 다이(D5)(D6) 사용하여 접속하도록 하여도 좋다.While the input circuit 2 is made to be in the same state as when receiving the VHF low pass when the UHF is received in the above embodiment, the input circuit 2 is as if the VHF is received when receiving the UHF, such as the autotuning tuner 21 shown in FIG. The UB terminal and the HB terminal may be connected using dies D 5 and D 6 so as to be in the same state as in high frequency reception.
그리고 UHF수신시에 VHF회로(1V)에 공급하는 전압은 UB단자로 부터가 아닌TU단자로 부터 취출되는 구성으로 하여도 좋다.The voltage supplied to the VHF circuit (1V) at the time of UHF reception may be taken out from the TU terminal, not from the UB terminal.
이상 설명한 바와 같이 본 고안의 전자동조튜너에 의하면 VHF튜너회로의 입력회로중의 스위칭 다이오드를 저역전용의 스위치용 전압단자. 혹은 고역전용의 스위칭용 전압단자가 모두 개로(開路)되는 UHF 수신시에 UHF튜너회로에 공급되는 전압에 의해 강제적으로 바이어스시키고 이것에 의해 스위칭 다이오드의 비직선왜곡에 의거하여 방해 VHF전파가 고차 왜곡파를 발생하지 않도록 구성하고 있기 때문에 VHF튜너회로와 UHF튜너회로를 강제적으로 바이어스 가능하게 접속하는 것만으로 UHF신호를 방해하는 VHF전파의 고차 왜곡파를 양호하게 억제할 수 있다.As described above, according to the fully-tuned tuner of the present invention, the switching diode in the input circuit of the VHF tuner circuit is a low voltage dedicated switch terminal. Alternatively, when UHF receiving all high-voltage dedicated switching voltage terminals is open, it is forcibly biased by the voltage supplied to the UHF tuner circuit, whereby the disturbing VHF propagation is higher-order distortion based on the nonlinear distortion of the switching diode. Since it is configured so that no wave is generated, it is possible to satisfactorily suppress the high-order distortion wave of the VHF radio wave that interferes with the UHF signal by simply forcibly connecting the VHF tuner circuit and the UHF tuner circuit.
이때문에 UHF수신시 화면에 비트나 웨이퍼등의 장해가 나타나지 않도록 할 수 있는 우수한 효과를 갖는다.For this reason, when UHF is received, it has an excellent effect of preventing a bit or a wafer from appearing on the screen.
Claims (1)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1982016034U JPS58119234U (en) | 1982-02-08 | 1982-02-08 | electronic tuning tuner |
| JP16034 | 1982-02-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR840003494U KR840003494U (en) | 1984-07-25 |
| KR890007396Y1 true KR890007396Y1 (en) | 1989-10-25 |
Family
ID=30028416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019820010612U KR890007396Y1 (en) | 1982-02-08 | 1982-12-30 | Electronic tuner |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS58119234U (en) |
| KR (1) | KR890007396Y1 (en) |
-
1982
- 1982-02-08 JP JP1982016034U patent/JPS58119234U/en active Pending
- 1982-12-30 KR KR2019820010612U patent/KR890007396Y1/en active
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58119234U (en) | 1983-08-13 |
| KR840003494U (en) | 1984-07-25 |
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