KR930005288Y1 - Electronic tuner for uhf & vhf - Google Patents
Electronic tuner for uhf & vhf Download PDFInfo
- Publication number
- KR930005288Y1 KR930005288Y1 KR2019880004198U KR880004198U KR930005288Y1 KR 930005288 Y1 KR930005288 Y1 KR 930005288Y1 KR 2019880004198 U KR2019880004198 U KR 2019880004198U KR 880004198 U KR880004198 U KR 880004198U KR 930005288 Y1 KR930005288 Y1 KR 930005288Y1
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- vhf
- uhf
- band
- signal
- tuning
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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
-
- 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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- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
내용 없음.No content.
Description
제1도는 본 고안의 회로도.1 is a circuit diagram of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
11 : UHF RF 앰프 12 : UHF 믹서11: UHF RF Amplifier 12: UHF Mixer
13 : UHF OSC 21 : VHF RF 앰프13: UHF OSC 21: VHF RF Amplifier
22 : VHF 단간동조단 23 : VHF 믹서22: VHF step inter-coordination stage 23: VHF mixer
24 : VHF OSC R2: 타밴드 블로킹 저항24: VHF OSC R 2 : other band blocking resistor
D1: VHF 블로킹 다이오드 D2: VHF 하이 밴드 선택 다이오드D 1 : VHF blocking diode D 2 : VHF high band select diode
D3: VHF 로우 밴드 선택 다이오드D 3 : VHF Low Band Select Diode
본 고안은 UHF와, VHF방송을 공용으로 수신하는 전자동조 튜너회로에 관한 것이다. 특히 UHF 밴드 선택시 오픈상태의 VHF 단간동조 주파수에 의해 UHF IF 주파수 특성이 떨어지는 것을 방지하기 위한 UHF, VHF 공용 전자 동조 튜너 회로에 관한 것이다.The present invention relates to a UHF and an electronic tuning tuner circuit for receiving VHF broadcast in common. In particular, the present invention relates to a UHF and VHF common-tuning tuner circuit for preventing the UHF IF frequency characteristics from dropping due to the open VHF intermittent tuning frequency when the UHF band is selected.
일반적인 UHF, VHF 공용 전자 동조 튜너의 회로동작을 제1도를 참조로 하여 설명하면, 안테나를 통하여 수신된 VHF 대역의 RF 신호 VHF RF 앰프(21)을 통하여 증폭된 후 VHF 단간동조단(22)에서 VHF 하이밴드 및 VHF 로우밴드별로 튜닝전압(VT)에 따라 선택 채널 주파수 대역이 결정되어 VHF 믹서(23)로 제공되고, 이 VHF 믹서(23)에 공급되는 VHF OSC(24)의 발진주파수에 의해 VHF IF 신호로 변환되어 출력된다.Referring to FIG. 1, a circuit operation of a general UHF and VHF shared electronic tuning tuner is amplified through an RF signal VHF RF amplifier 21 of a VHF band received through an antenna, and then a VHF intermittent tuning stage 22. In the VHF high band and the VHF low band, the selected channel frequency band is determined according to the tuning voltage (V T ) and supplied to the VHF mixer 23, and the oscillation frequency of the VHF OSC 24 supplied to the VHF mixer 23 is provided. Is converted into a VHF IF signal and output.
또한 안테나를 통하여 수신된 UHF 대역의 RF 신호는 UHF RF 앰프(11)를 통하여 증폭된 후 UHF 믹서(12)에서 UHF OSC(13)의 발진주파수에 믹싱되어 UHF IF 신호로 변환되고, 이어서 상기 VHF 믹서(23)를 거쳐 VHF IF 신호 출력단을 공통으로 하여 UHF IF 신호가 출력된다. 이때(UHF 밴드 선택시) VHF 믹서 (23)는 단순 증폭기로써의 기능을 발휘한다.In addition, the RF signal of the UHF band received through the antenna is amplified by the UHF RF amplifier 11 and mixed in the oscillation frequency of the UHF OSC 13 in the UHF mixer 12 is converted into a UHF IF signal, and then the VHF Via the mixer 23, the UHF IF signal is output in common with the VHF IF signal output terminal. At this time (when UHF band is selected), VHF mixer 23 functions as a simple amplifier.
그런데, 이와 같은 UHF, VHF 공용 튜너에서는 UHF밴드가 선택되어 VHF 단간동조단이 오픈되어 있을 때, 즉 밴드 선택 전압(BI, 또는 BH)이 없을때에는 튜닝전압(VT)이 특정채널 주파수(45MHz)로 출력는 경우 UHF밴드의 IF에 영향을 주게 되므로, 해당특정채널에서의 주파수 특성이 현저히 떨어지게 되는 문제점이 나타나고 있었다.However, in such a UHF and VHF shared tuner, when the UHF band is selected and the VHF inter-step tuning stage is open, that is, when there is no band selection voltage (B I or B H ), the tuning voltage (V T ) is a specific channel frequency. Since the output at (45MHz) affects the IF of the UHF band, there was a problem that the frequency characteristic of the specific channel is significantly decreased.
본 고안은 상기와 같은 UHF, VHF 공용 튜너에서의 특정채널 주파수 특성저하를 간단히 회로의 추가로써 해결할 수 있는 UHF, VHF 공용 전자 동조 튜너회로를 제공하는데 목적이 있다.The object of the present invention is to provide a UHF, VHF common tuning tuner circuit that can solve the specific channel frequency degradation in the UHF, VHF common tuner by simply adding a circuit.
이하 첨부한 제1도에 따라 본 고안을 설명하면 다음과 같다.Hereinafter, the present invention according to the attached FIG. 1 is as follows.
먼저, 안테나를 통하여 입력되는 UHF RF 신호는 VHF RF 앰프(11)를 거쳐 UHF 믹서(12)에서 UHF OSC(13)의 발진주파수에 믹싱되어 UHF IF 신호로 변환출력되게 구성하고, 상기 UHF 믹서(12)의 UHF IF 신호는 저항(R6,R1)을 통한 UHF밴드 선택전압(Bu)으로 바이어스되는 타밴드 블로킹 다이오드(D1)와 증폭기로 동작하는 VHF 믹서(23)를 거쳐 출력되게 구성한다.First, the UHF RF signal input through the antenna is configured to be mixed with the oscillation frequency of the UHF OSC 13 in the UHF mixer 12 via the VHF RF amplifier 11 and converted into an UHF IF signal, and then converted into an UHF IF signal. The UHF IF signal of 12) is configured to be output through the other band blocking diode (D 1 ) biased to the UHF band selection voltage (Bu) through the resistors (R 6 , R 1 ) and the VHF mixer (23) acting as an amplifier. do.
또한 안테나를 통하여 입력되는 VHF RF 신호는 VHF RF 앰프(21)와 VHF 하이밴드 선택 전압(BH), VHF 로우 밴드 선택전압(BL) 및 튜닝전압(VT)이 인가되는 VHF 단간동조단(22)을 거쳐 VHF 믹서(23)에서 VHF OSC(24)의 발진주파수 신호에 믹싱되어 VHF IF 신호로 출력되게 구성한다.In addition, the VHF RF signal input through the antenna is VHF RF amplifier 21, VHF high-band select voltage (B H ), VHF low-band select voltage (B L ) and the tuning voltage (V T ) is applied to the VHF inter-terminal coordination stage Through the 22, the VHF mixer 23 mixes the oscillation frequency signal of the VHF OSC 24 to output the VHF IF signal.
상기 VHF 단간동조단(22)은 1차 동조 코일(L3,L4)과 2차 동조코일(L1,L2)에 의한 단간 동조회로로 구성하며, 상기 2차 동조코일(L1)에는 저항(R3,R4)을 통한 VHF 하이밴드 선택 전압(BH)으로 바이어스 되는 VHF 하이밴드 선택 다이오드(D2)를 통하여 동조 콘덴서(C3)가 연결되게 구성하고, 상기 2차 동조 코일(L2)에는 동조 콘덴서(C5)를 연결하며 구성한다. 한편 VHF 로우밴드 선택전압(BL) 및 VHF 하이밴드 선택전압(BH)은 VHF RF 앰프(21)의 구동전압으로도 제공된다. 또한 2차동조단에는 저항(R5)을 통한 튜닝전압(VT)이 바렉터 다이오드(D4)에 인가되게 구성하고, 이 바렉터 다이오드(D4)의 용량과 콘덴서(C4)의 합성용량에 따라 채널 주파수가 선택되게 구성한다.The VHF single-ended tuning stage 22 is composed of a single-step tuning circuit by primary tuning coils L 3 and L 4 and secondary tuning coils L 1 and L 2 , and the secondary tuning coil L 1 . The tuning capacitor C 3 is configured to be connected to the tuning capacitor C 3 via the VHF high band selection diode D 2 biased to the VHF high band selection voltage B H through the resistors R 3 and R 4 . Coil L 2 is configured by connecting a tuning capacitor C 5 . The VHF low band selection voltage B L and the VHF high band selection voltage B H are also provided as driving voltages of the VHF RF amplifier 21. In addition, two differential Jordan, the resistance (R 5) Synthesis of the tuning voltage (V T) the varactor diode is to be configured to (D 4), and a varactor diode (D 4) capacity and a capacitor (C 4) of the through The channel frequency is selected according to the capacity.
특히 UHF 블로킹 다이오드(D1)를 통한 UHF 밴드 선택전압(Bu)은 타밴드 블로킹 저항(R2)을 통하여 상기 VHF 하이밴드 선택용 다이오드(D2)를 구동하게 연결하여 구성한다.In particular, the UHF band selection voltage Bu through the UHF blocking diode D 1 is configured by driving the VHF high band selection diode D 2 through the other band blocking resistor R 2 .
이와 같이 구성된 본 고안의 작용 및 효과를 설명하면 다음과 같다.Referring to the operation and effects of the present invention configured as described above are as follows.
먼저 VHF 로우밴드 선택전압(BL)이 발생되면 VHF RF 앰프(21)는 안테나의 VHF RF 신호를 증폭하여 VHF 단간동조단(22)의 1차 동조코일(L3,L4)로 출력하게 되고, 이에 따라 2차동조코일(L1,L2)과 동조콘덴서(C5)에 의해 VHF 로우밴드의 동조가 이루어지게 된다.First, when the VHF low band selection voltage (B L ) is generated, the VHF RF amplifier 21 amplifies the VHF RF signal of the antenna and outputs it to the first tuning coils L 3 and L 4 of the VHF inter-terminal tuning stage 22. As a result, the VHF low band is tuned by the secondary tuning coils L 1 and L 2 and the tuning capacitor C 5 .
또한 VHF 로우밴드 선택전압(BH)이 발생되면 다이오드(D2)가 온되므로 단간2차동조단은 2차 동조코일(L1)과 동조콘덴서(C3)에 의해 VHF 하이밴드의 동조가 이루어지게 된다.In addition, when the VHF low band selection voltage (B H ) is generated, the diode (D 2 ) is turned on, so the second-to-end secondary tuning stage is synchronized with the VHF high band by the secondary tuning coil (L 1 ) and the tuning capacitor (C 3 ). You lose.
이와 같이 VHF 로우 또는 VHF 하이밴드 동조상태에서 튜닝전압(VT)에 따라 바렉터 다이오드(D4)에 따른 바렉터 다이오드(D4)의 용량변화를 통하여 선택 채널 신호가 동조되면, 이러한 RF 채널 동조주파수 신호는 VHF 믹서(23)에서 VHF OSC(24)의 발진주파수 신호에 믹싱되어 VHF IF 신호로 변환 출력된다. 특히 VHF 하이밴드 선택 전압(BH)은 타밴드 블로킹 저항(R2)을 통하여 UHF블로킹 다이오드(D1)를 오프시키게 되므로 VHF 믹서(23)로 유입될 UHF IF 신호의 리키지를 억제시킨다.When thus the selected channel signal tuned by the capacitance change of the varactor diode (D 4) of the varactor diode (D 4) according to the tuning voltage (V T) in the VHF low or VHF high-band tuning state, these RF channel The tuned frequency signal is mixed with the oscillation frequency signal of the VHF OSC 24 in the VHF mixer 23 and converted into a VHF IF signal. In particular, the VHF high band selection voltage B H turns off the UHF blocking diode D 1 through the other band blocking resistor R 2 , thereby suppressing the leakage of the UHF IF signal to be introduced into the VHF mixer 23.
한편 UHF 밴드 선택 전압(Bu)이 발생되면 안테나의 UHF RF 신호는 UHF RF 앰프(11)를 거쳐 UHF 믹서(12)에서 UHF OSC(13)의 발진주파수 신호에 믹싱되어 UHF IF 신호로 변환 출력된다.On the other hand, when the UHF band selection voltage Bu is generated, the UHF RF signal of the antenna is mixed with the oscillation frequency signal of the UHF OSC 13 by the UHF mixer 12 via the UHF RF amplifier 11 and converted into a UHF IF signal. .
이러한 UHF 믹서(12)의 IF 신호는 저항(R1,R6)으로 바이어스되어 온된 UHF 블로킹 다이오드(D1)를 거쳐 UHF 밴드 선택시에는 단지 앰프 기능만을 실행하게 되는 VHF 믹서(23)에서 증폭되어 출력된다.The IF signal of the UHF mixer 12 is amplified by the VHF mixer 23 which performs only the amplifier function when selecting the UHF band through the UHF blocking diode D 1 biased by the resistors R 1 and R 6 . And output.
이때 UHF 블로킹 다이오드(D1)를 거친 UHF 밴드 선택전압(Bu)은 타밴드 블로킹 저항(R2)을 통하여 상기 VHF 단간 동조단(22)의 VHF 하이밴드 선택용 다이오드(D2)를 온시키주게 되므로, VHF 단간동조단(22)을 VHF 하이밴드로 스위칭시키게 된다.At this time, the UHF band selection voltage Bu passing through the UHF blocking diode D 1 turns on the VHF high band selection diode D 2 of the tuning stage 22 between the VHF stages through another band blocking resistor R 2 . As a result, the VHF interlevel tuning stage 22 is switched to the VHF high band.
이때의 단간동조단은 동조대역이 수백 MHz에 이르게 되므로 UHF IF 신호 대역에서 충분히 이격되게 되어 특정 채널에서의 UHF IF 신호 특성이 저하되는 것을 방지할 수 있게 된다.In this case, since the tuning band reaches several hundred MHz, the tuning band is sufficiently spaced apart from the UHF IF signal band, thereby preventing the UHF IF signal characteristic from being deteriorated in a specific channel.
이상에서 설명한 바와 같은 본 고안은 기존의 UHF, VHF 공용튜너회로에 간단한 타밴드 블로킹 저항 및 VHF블로킹 다이오드를 마련하는 것으로 특정 UHF 채널에서의 IF 신호 특성이 떨어지는 것을 방지할 수 있게 되는 특유의 효과가 나타나게 된다.As described above, the present invention provides a simple other band blocking resistor and a VHF blocking diode in the existing UHF and VHF common tuner circuits, and thus has a unique effect of preventing the IF signal characteristic from falling in a specific UHF channel. Will appear.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019880004198U KR930005288Y1 (en) | 1988-03-29 | 1988-03-29 | Electronic tuner for uhf & vhf |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019880004198U KR930005288Y1 (en) | 1988-03-29 | 1988-03-29 | Electronic tuner for uhf & vhf |
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| Publication Number | Publication Date |
|---|---|
| KR890020146U KR890020146U (en) | 1989-10-05 |
| KR930005288Y1 true KR930005288Y1 (en) | 1993-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR2019880004198U KR930005288Y1 (en) | 1988-03-29 | 1988-03-29 | Electronic tuner for uhf & vhf |
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| KR100406353B1 (en) * | 2001-12-14 | 2003-11-19 | 삼성전기주식회사 | Switching circuit for input tuning in television tuner |
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