KR930008088Y1 - Tuner agc compensation circuit - Google Patents

Tuner agc compensation circuit Download PDF

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Publication number
KR930008088Y1
KR930008088Y1 KR2019870020898U KR870020898U KR930008088Y1 KR 930008088 Y1 KR930008088 Y1 KR 930008088Y1 KR 2019870020898 U KR2019870020898 U KR 2019870020898U KR 870020898 U KR870020898 U KR 870020898U KR 930008088 Y1 KR930008088 Y1 KR 930008088Y1
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South Korea
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amplifier
intermediate frequency
band selection
gain control
tuner
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KR2019870020898U
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Korean (ko)
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KR890011875U (en
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민병곤
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주식회사 금성사
최근선
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
    • 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

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

내용 없음.No content.

Description

튜너 AGC 보상회로Tuner AGC Compensation Circuit

제 1 도는 종래 및 본 고안의 동작설명을 위한 AGC전압과 이득에 대한 관계를 도시한 그래프.1 is a graph showing the relationship between the AGC voltage and gain for explaining the operation of the prior art and the present invention.

제 2 도는 종래의 회로도.2 is a conventional circuit diagram.

제 3 도는 본 고안의 회로도.3 is a circuit diagram of the present invention.

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

1 : 밴드선택부 2 : 튜너부1: Band selector 2: Tuner

3 : 전단증폭기 4 : 표면음향파필터3: shear amplifier 4: surface acoustic wave filter

5 : 영상중간주파수 R10-R13: 저항5: Video intermediate frequency R 10 -R 13 : Resistance

6 : 이득조정부 VR10: 가변저항6: Gain adjuster VR 10 : Variable resistor

C10, C11: 콘덴서C 10 , C 11 : condenser

본 고안은 VHF/UHF 튜너 조정에 있어서 튜너 자동이득제어(AGC) 보상회로에 관한 것으로, 특히 VHF 튜너 단일조정에 의해 UHF 대역이 조정되도록 하여 전대역에 적당한 이득을 제어할 수 있게한 튜너 AGC 보상회로에 관한 것이다.The present invention relates to a tuner automatic gain control (AGC) compensation circuit in VHF / UHF tuner adjustment. In particular, the tuner AGC compensation circuit enables the UHF band to be adjusted by the VHF tuner single adjustment to control the gain appropriately for the entire band. It is about.

종래의 일반적인 튜너 AGC 회로에 있어 튜너는 45MHz-900MHz까지의 6MHz 또는 7MHz의 대역을 필터링하여 중간주파화 할 경우에는 VHF로우밴드 및 VHF 하이밴드에서는 이득이 높고 잡음지수(Noise Figure)도 양호하여 신호대잡음비(S/N)가 대체적으로 양호하나, UHF대역에서는 단간리드(Lead)나 판코일등의 유도성 임피던스에 의해 영향을 받기 때문에 이득이 감소되는 결함이 있었다.In the conventional general tuner AGC circuit, the tuner has a high gain in the VHF low band and the VHF high band and a good noise figure when the intermediate frequency is filtered by filtering the band of 6 MHz or 7 MHz from 45 MHz to 900 MHz. Although the noise ratio (S / N) is generally good, in the UHF band, there is a defect that the gain is reduced because it is affected by inductive impedance such as lead or plate coil.

따라서 이에 대응하기 위해서는 튜너 고주파증폭기의 이득을 VHF/UHF 밴드선택에 따라 증폭도를 다르게 해주어야 되는바, 즉, 제 1 도에 도시한 바와같이 이득점(A)은 UHF일 경우의 AGC 조정포인트이며, 이득점(B)은 VHF일 경우의 동일신호잡음비를 얻기 위한 이득의 손실, 즉 UHF대역에서의 손실을 나타낸다.Therefore, in order to cope with this, the gain of the tuner high-frequency amplifier must be varied according to the VHF / UHF band selection. That is, as shown in FIG. 1, the gain point A is the AGC adjustment point in the case of UHF. The gain point B represents a loss of gain for obtaining the same signal noise ratio in the case of VHF, that is, a loss in the UHF band.

그러나 이와같이 이득의 손실을 보상하기 위한 회로가 제 2 도에 도시한 바와같이 구성한 회로가 있으나, 이는 VHF 밴드 및 UHF밴드의 조정을 가변저항(VR1)(VR2)의 가변에 따라 조정손실에 따른 PIF집적회로에 제로 바이어스를 공급하지 않게하기 위해 저항(R1)(R2)으로 보상하게 하였으나, 이 회로 역시 VHF 및 UHF밴드에 따라 가변저항(VR1)(VR2)을 가변시키는 중복조정이 필요하므로 번거로울 뿐아니라 제조원가면에서 상승요인이 되는 생산관리 포인트가 저하되는 결함이 있었다.However, there is a circuit configured to compensate for the loss of gain as shown in FIG. 2, but this adjusts the adjustment of the VHF band and the UHF band to the adjustment loss according to the variable resistance VR 1 (VR 2 ). In order to avoid supplying zero bias to the PIF integrated circuit, the resistor R 1 (R 2 ) is compensated for, but the circuit also varies the variable resistors VR 1 and VR 2 according to the VHF and UHF bands. It was not only cumbersome because it needed adjustment, but also a defect that lowered the production control point, which is a rising factor in manufacturing cost.

본 고안은 이와같은 종래의 결함을 감안하여, VHF단일조정에 의해 UHF대역이 조정되도록 안출한 것으로, 이를 첨부된 도면에 의하여 상세히 설명하면 다음과 같다.The present invention is designed to adjust the UHF band by the VHF single adjustment in view of the conventional defects, as described in detail by the accompanying drawings as follows.

제 3 도는 본 고안의 튜너 AGC 보상회로도로서 이에 도시한 바와 같이, 안테나(ANT)로 입력되는 신호를 최대 효율로 매칭시키기 위한 입력매칭회로(2b)및 고주파신호의 이득을 증폭하는 고주파증폭기(2c)로 증폭하여 혼합기(2b)에 인가하는 동시에 국부발진부(2e)에서 인가되는 튜닝전압(BS)에 따라 국부발진신호를 혼합하여 중합기(2b)에 인가하는 동시에 국부발진부(2e)에서 인가되는 튜닝전압(BS)에 따라 국부발진신호를 혼합하여 중간주파신호로 변환하고, 그 변환된 신호를 증폭하는 중간주파증폭기(2f)로 구성된 공지의 튜너부(2)와, 상기 튜너부(2)를 통한 신호는 전단증폭기(3) 및 표면음향파필터(SAW)(4)를 통해 증폭 및 필터링되어 중간주파증폭기(5a) 및 영상검파회로(5b)를 통해 자동주파수제어부(5c)및 영상증폭기(5b)에 인가되고, 상기 영상증폭기(5b)의 출력신호를 중간주파자동이득제어부(5e)에서 입력받아 상기 중간주파증폭기(5a)이득을 제어하고, 그 중간주파 자동이득제어부(5e)의 출력신호를 고주파 자동이득제어부(5f)에서 입력받아 저항(R10)(R11) 및 콘텐서(C11)를 통해 상기 튜너부(2)의 고주파증폭기(2c)의 이득을 제어하게 동작하는 공지의 영상중간주파부(5)를 구성하고, 밴드선택전압(UHV, VHV, VLV)이 인가되는 밴드선택부(1)의 UHF및 VHF하이, 로우밴드선택단자(UH)(VH)(VL)를 상기 공지의 튜너부(2)의 밴드스위칭부(2a)에 접속하고, 밴드선택부(1)의 UHF 밴드선택단자(UH)를 저항(R12)(R13) 및 다이오드(D10)로 구성된 이득조정부(6)를 다시 통해 가변저항(VR10)및 상기 고주파자동이득제어부(5f)의 입력측 접속점에 접속하여 구성한 것이다.3 is a tuner AGC compensation circuit diagram of the present invention, as shown therein, an input matching circuit 2b for maximally matching a signal input to an antenna ANT and a high frequency amplifier 2c for amplifying a gain of a high frequency signal. Amplified by the oscillator and applied to the mixer 2b, mixed with the local oscillation signal according to the tuning voltage BS applied by the local oscillator 2e, and applied to the polymerizer 2b, and applied by the local oscillator 2e. A known tuner section 2 composed of an intermediate frequency amplifier 2f for mixing local oscillation signals according to the tuning voltage BS, converting them into intermediate frequency signals, and amplifying the converted signals; and the tuner section 2 The signal through is amplified and filtered through the shear amplifier (3) and the surface acoustic wave filter (SAW) (4) through the intermediate frequency amplifier (5a) and the image detection circuit (5b) automatic frequency control unit (5c) and image amplifier Applied to 5b, and output of the image amplifier 5b. Receives a call from the intermediate frequency automatic gain control unit 5e and controls the gain of the intermediate frequency amplifier 5a, and receives the output signal of the intermediate frequency automatic gain control unit 5e from the high frequency automatic gain control unit 5f. R 10 ) (R 11 ) and a condenser (C 11 ) constitute a known image intermediate frequency part (5) which operates to control the gain of the high frequency amplifier (2c) of the tuner (2), band selection The UHF and VHF high and low band selection terminals UH (VH) (VL) of the band selector 1 to which the voltages UHV, VHV, and VLV are applied are replaced by the band switching unit of the known tuner 2. 2H), and the UHF band select terminal UH of the band selector 1 through the gain adjuster 6 composed of resistors R 12 , R 13 and diode D 10 . 10 ) and the input side connection point of the high frequency automatic gain control section 5f.

이와같이 구성된 본 고안의 작용효과를 상세히 설명하면 다음과 같다.Referring to the effects of the present invention configured in this way in detail as follows.

안테나(ANT)에 의하여 신호가 수신되고, 밴드선택부(1)에서 선택된 밴드선택전압(UHV, VHV, VLV)에 따라 안테나(ANT)에 수신된 신호는 튜너부(2)의 입력매칭회로(2b)를 통해 매칭되어 고주파증폭기(2c)에 공급되고, 이 고주파증폭기(2c)에 의하여 증폭되어 혼합기(2d)에 취입하는 동시에 채널의 선택에 의해 인가되는 튜닝전압(BS)에 따라 발진되는 국부발진부(2e)의 출력신호로 취입하여 상기 혼합기(2d)에서 혼합됨으로써 주파수변환하여 튜닝주파수에 해당하는 중간주파신호를 형성하고, 이 중간주파신호는 중간주파증폭기(2f)및 전단증폭기(3)를 통해 증폭된 후 표면음향파필터(4)를 통해 불필요한 주파수성분이 필터링되고, 영상중간주파부(5)의 중간주파증폭기(5a)에서 증폭되고 영상검파회로(5b)를 통해 검파되어 자동주파수제어부(5c)및 영상증폭기(5d)에 공급되고, 영상증폭기(5d)에서 증폭된 신호는 중간주파자동이득제어부(5e)를 통해 상기 중간주파증폭기(5a)의 이득제어신호로 인가되고, 또한 고주파자동이득제어부(5f)에 인가되어 그 입력이득에 따라 튜너부(2)의 출력신호를 제어하게 된다. 즉, 가변저항(VR10)의 가변에 따른 상기 영상중간주파부(5)의 고주파자동이득제어부(5f)를 제어하여, 저항(R10)(R11)에 의해 분할된 AGC전압으로 고주파증폭기(2c)에 공급되어 수신신호에 따른 균형을 제어하게 된다. 이러한 튜닝시스템은 공지의 블록으로서 티브이, 브이씨알과 같은 채널튜닝기술에서 널리 사용되고 있다. 그런데, 본 발명은 제 1 도를 참조하여 설명하면, 가변저항(VR10)을 기준하여 VHF밴드의 AGC전압 포인트이득점(B)를 설정한 후 UHF대역에서는 VHF밴드전압을 기준삼아 이득조정부(6)의 저항(R12)(R13)에 의한 분할전압에 의해 이득점(B')을 유지하도록 고려하여 VHF 밴드조정시에 따른 영향은 이득조정부(6)의 다이오드(D10)로 차단시키고, 상기 가변저항(VR10)의 가변에 따른 조정으로 실질적으로 VHF/UHF 동시 조정하는 효과와 전대역에 적당한 이득을 제어하게 되므로 인접채널 방해가 배제가능할 뿐아니라 간단한 동일 보상회로의 구성으로 제조원가의 절감의 효과 및 생산성 관리 포인트를 향상시키는 효과가 있다.The signal is received by the antenna ANT, and the signal received by the antenna ANT according to the band selection voltages UHV, VHV, and VLV selected by the band selector 1 is input to the input matching circuit of the tuner 2. A local part which is matched through 2b) and supplied to the high frequency amplifier 2c, amplified by the high frequency amplifier 2c, blown into the mixer 2d, and oscillated according to the tuning voltage BS applied by the channel selection. It is taken as the output signal of the oscillator 2e and mixed in the mixer 2d to convert the frequency into an intermediate frequency signal corresponding to a tuning frequency. The intermediate frequency signal is an intermediate frequency amplifier 2f and a shear amplifier 3. After the amplification through the surface acoustic wave filter (4), unnecessary frequency components are filtered out, amplified by the intermediate frequency amplifier (5a) of the image intermediate frequency unit (5) and detected by the image detection circuit (5b) and the automatic frequency Supplied to the control section 5c and the image amplifier 5d, The signal amplified by the image amplifier 5d is applied as a gain control signal of the intermediate frequency amplifier 5a through the intermediate frequency automatic gain control unit 5e, and is also applied to the high frequency automatic gain control unit 5f and its input gain. The output signal of the tuner section 2 is controlled accordingly. That is, the high frequency automatic gain control unit 5f of the image intermediate frequency unit 5 according to the variable resistance VR 10 is controlled, and the high frequency amplifier is divided into AGC voltages divided by the resistors R 10 and R 11 . It is supplied to 2c to control the balance according to the received signal. Such a tuning system is a well-known block and is widely used in channel tuning techniques such as TV and VRC. However, the present invention will be described with reference to FIG. 1, after setting the AGC voltage point gain point (B) of the VHF band based on the variable resistor VR 10 , and in the UHF band, the gain adjusting unit 6 based on the VHF band voltage. Considering that the gain point B 'is maintained by the divided voltage of the resistors R 12 and R 13 , the effect of adjusting the VHF band is cut off by the diode D 10 of the gain adjusting unit 6. By controlling the variable resistance (VR 10 ) according to the variable, the effect of substantially adjusting the VHF / UHF simultaneously and controlling the appropriate gain for the entire band is not only possible to eliminate the adjacent channel disturbance, but also to reduce the manufacturing cost by configuring the same compensation circuit. There is an effect of improving the effectiveness and productivity management point.

Claims (2)

밴드선택부(1)의 UHF, VHF하이, VHF로우밴드선택단자(UH, VH, VL)가 밴드스위칭부(2a)에 접속되고, 안테나를 통해 수신되는 방송신호중 상기 밴드스위칭부(2b)에서 출력된 채널에 해당되는 주파수가 선택되어 입력매칭회로(2b)에 입력되고, 상기 입력매칭회로(2b)의 출력신호가 고주파증폭기(2c), 국부발진부(2e)의 국부발진신호를 인가받는 혼합기(2d)및 중간주파증폭기(2f)를 순차로 통해 출력되는 튜너부(2)와, 상기 중간주파증폭기(2f)의 출력신호가 전단증폭기(3) 및 표면 음향파 필터(4)를 통한후 중간주파 증폭기(5a)및 영상검파회로(5b)를 통해 자동주파수제어부(5c)및 영상증폭기(5d)에 인가되고, 그 영상증폭기(5d)의 출력신호가 중간주파 자동이득제어부(5e)에 인가되고, 그 영상증폭기(5d)의 출력신호가 중간주파 자동이득제어부(5e)를 통해 상기 중간주파증폭기(5a)의 이득제어단자에 인가됨과 아울러 입력에 가변저항(VR10)이 접속된 고주파 자동이득제어부(5f)를 다시 통해 상기 고주파증폭기(2c)의 이득제어단자에 인가되는 영상중간주파부(5)로 구성된 튜너 AGC회로에 있어서, 상기 밴드선택부(1)의 UHF 밴드선택단자(UF)에서 출력되는 UHF밴드선택신호에 따라 상기 고주파 자동이득제어부(5f)의 이득조절용 가변저항(VR10)의 레벨을 변환시키는 이득조정부(6)를 포함하여 구성된 것을 특징으로 하는 튜너 AGC 보상회로.The UHF, VHF high, and VHF low band selection terminals UH, VH, and VL of the band selection unit 1 are connected to the band switching unit 2a, and in the band switching unit 2b of the broadcast signals received through the antenna. A mixer in which a frequency corresponding to the output channel is selected and input to the input matching circuit 2b, and the output signal of the input matching circuit 2b receives the local oscillation signal of the high frequency amplifier 2c and the local oscillator 2e. (2d) and the tuner section 2 which is sequentially output through the intermediate frequency amplifier 2f, and the output signal of the intermediate frequency amplifier 2f through the shear amplifier 3 and the surface acoustic wave filter 4 The intermediate frequency amplifier 5a and the image detection circuit 5b are applied to the automatic frequency controller 5c and the image amplifier 5d, and the output signal of the image amplifier 5d is supplied to the intermediate frequency automatic gain control unit 5e. Is applied, and the output signal of the image amplifier 5d is passed through the intermediate frequency automatic gain control unit 5e to the intermediate frequency amplifier 5a. Applied to the gain control terminal as soon as well as consisting of a variable resistor (VR 10), gain control terminal video intermediate frequency section 5 is applied to the high-frequency amplifier (2c) through again the high frequency automatic gain control (5f) is connected to the input In the tuner AGC circuit, in accordance with the UHF band selection signal output from the UHF band selection terminal UF of the band selection unit 1, the level of the variable resistor VR 10 for gain adjustment of the high frequency automatic gain control unit 5f is adjusted. A tuner AGC compensation circuit comprising a gain adjusting section (6) for converting. 제 1 항에 있어서, 이득조정부(6)는 밴드선택부(1)의 UHF 밴드선택단자(UH)에서 출력되는 UHF 밴드선택신호 전압을 분할하는 저항(R12, R13)과, 그 저항(R12, R13)에서 분할된 전압을 가변저항(VR10)에 인가하는 다이오드(D10)로 구성하여 된 것을 특징으로 하는 튜너 AGC 보상회로.2. The gain adjusting section (6) according to claim 1, wherein the gain adjusting section (6) includes resistors (R 12 , R 13 ) for dividing the UHF band selection signal voltage output from the UHF band selection terminal (UH) of the band selection section (1), Tuner AGC compensation circuit, characterized in that consisting of a diode (D 10 ) for applying the voltage divided by R 12 , R 13 ) to the variable resistor (VR 10 ).
KR2019870020898U 1987-11-30 1987-11-30 Tuner agc compensation circuit KR930008088Y1 (en)

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KR930008088Y1 true KR930008088Y1 (en) 1993-12-08

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