KR930005289Y1 - If output circuit for tuner - Google Patents

If output circuit for tuner Download PDF

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Publication number
KR930005289Y1
KR930005289Y1 KR2019880002513U KR880002513U KR930005289Y1 KR 930005289 Y1 KR930005289 Y1 KR 930005289Y1 KR 2019880002513 U KR2019880002513 U KR 2019880002513U KR 880002513 U KR880002513 U KR 880002513U KR 930005289 Y1 KR930005289 Y1 KR 930005289Y1
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South Korea
Prior art keywords
tuner
tuning
circuit
double
signal
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KR2019880002513U
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Korean (ko)
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KR890018299U (en
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김영중
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삼성전기 주식회사
서주인
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Publication of KR930005289Y1 publication Critical patent/KR930005289Y1/en

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/14—Balanced arrangements
    • H03D7/1425—Balanced arrangements with transistors
    • H03D7/1433—Balanced arrangements with transistors using bipolar transistors

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

내용 없음.No content.

Description

튜너의 중간주파(IF) 출력회로Tuner Intermediate Frequency (IF) Output Circuit

제1도는 본 고안의 회로도이다.1 is a circuit diagram of the present invention.

제2도는 중간주파 영상 및 음성 중간주파특성 그래프로써, 제2a도는 종래의 특성 그래프이고, 제2b도는 본 고안의 특성 그래프이다.2 is an intermediate frequency image and audio intermediate frequency characteristic graph, FIG. 2a is a conventional characteristic graph, and FIG. 2b is a characteristic graph of the present invention.

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

1 : OSC 2 : 믹서부1: OSC 2: Mixer

3 : 40.4MHz트랩부 4 : IF증폭부3: 40.4 MHz trap section 4: IF amplifier section

5 : 복동조부5: double acting grandfather

본 고안은 복동조의 IF출력단에 영상 중간주파수 하측에 트랩 회로를 구비시킨 튜너의 중간주파 출력회로에 관한 것이다.The present invention relates to an intermediate frequency output circuit of a tuner provided with a trap circuit below the image intermediate frequency at the IF output stage of a double tuning.

일반적으로 양산되는 유선방송 TV(일명 CA-TV)나 VTR에 있어서의 튜너는 주로 우리나라의 전파 및 품질규격조건에 일치하게끔 설계되는 것이 보통이나, 이것이 유럽 및 기타국가에로 수출되는 품목일 경우는 그 해당국가의 전파 및 품질규격으로 설계되어지지 않으면 아니된다.Tuners in cable TV (aka CA-TV) or VTR that are generally mass-produced are usually designed to be in line with the radio wave and quality standards of Korea. It must be designed according to the radio wave and quality standards of that country.

따라서, 이러한 튜너에 있어서 서독의 FTZ나 이태리국의 호모로게이션(Ho mologation)의 엄격한 규격조건 테스트중 S-1 테스트를 만족하기 위한 중간주파 회로가 필요하다.Therefore, in such a tuner, a medium frequency circuit is required to satisfy the S-1 test during the strict specification test of FTZ in West Germany or Ho mologation in Italy.

그러나, 종래의 선행기술에서는 이러한 요건 즉, 일정한 튜너 특성 규격을 충족시킬 수 있는 회로가 채택되어 있지 않으므로서 수출에 제약이 뒤따랐다.However, in the prior art, there is a restriction on exports because no circuit is adopted that can satisfy this requirement, that is, a tuner characteristic specification.

본 고안의 목적은 상기와 같은 튜너의 특성의 해외 규격조건에 만족하는 튜너 중간주파 출력 회로를 제공하는데 있다.An object of the present invention is to provide a tuner intermediate frequency output circuit that satisfies the international standard conditions of the characteristics of the tuner as described above.

본 고안은 특히 튜너의 복동조 IF출력단에 특정주파수의 트랩회로를 구비시킨 회로를 그 특징으로 한다.The present invention is particularly characterized by a circuit in which a trap circuit of a specific frequency is provided at the double-tuning IF output stage of the tuner.

이하 첨부된 도면에 기초하여 본 고안을 설명하면 다음과 같다.Hereinafter, the present invention will be described based on the accompanying drawings.

제1도는 본 고안의 영상중간주파 하측 트랩회로가 포함된 복동조 중간주파 회로의 구성을 보이고 있다.1 shows the configuration of a double-tuned intermediate frequency circuit including the image intermediate frequency lower trap circuit of the present invention.

여기에서 참조되는 바와 같이, RF단간 동조부(도시생략)을 거친 RF입력신호는 믹서 트랜지스터(T1), 바이어스 저항(R1-R2) 및 바이패스 콘덴서(C8)을 포함하는 믹서부(2)에서 OSC(1)의 발진신호에 믹싱되게 구성하고,상기 믹서부(2)에서 출력되는 IF(중간주파)신호는 증폭 트랜지스터(T2), 바이패스콘덴서(C8), 동조콘덴서(C1), 바이어스 저항(R4, R5) 및 댐핑 저항(R6)을 포함하는 IF 증폭부(4)에서 증폭되게 구성하고, 상기 IF 증폭부(4)에서 출력되는 IF신호는 동조코일(L1) 및 동조콘덴서(C2)에 의한 영상동조회로와 동조 코일(L2) 및 동조콘덴서(C4)에 의한 음성동조 회로를 포함하는 복동조부(5)에서 복동조되게 구성하고, 상기 복동조부(5)의 출력은 트랩코일(L3) 및 크랩콘덴서(C5-C7)와 댐핑저항(R7)으로 구성된 40.4MHz 트랩부(3)에서 영상중간주파수 하측의 40.4MHz에 트랩이 걸린 최종 IF 신호로 출력되게 구성한다.As referred to herein, the RF input signal passed through the RF stage tuning unit (not shown ) includes a mixer unit including a mixer transistor T 1 , a bias resistor R 1- R 2 , and a bypass capacitor C 8 . In (2), the oscillation signal of the OSC 1 is configured to be mixed, and the IF (intermediate frequency) signal output from the mixer unit 2 includes an amplifying transistor T 2 , a bypass capacitor C 8 , and a tuning capacitor. (C 1 ), the bias resistor (R 4 , R 5 ) and the damping resistor (R 6 ) configured to be amplified in the IF amplifier 4, the IF signal output from the IF amplifier 4 is tuned And configured to be double-tuned in the double-tuning unit 5 including an image tuning circuit by the coil L 1 and a tuning capacitor C 2 and an audio tuning circuit by the tuning coil L 2 and the tuning capacitor C 4 . the output of the double-acting demodulator 5 is video intermediate frequency of the trap coil (L 3) and crab capacitor (C 5 -C 7) and the damping resistor (R 7) 40.4MHz trap portion 3 consisting of It is configured to be output as the final signal IF trap is taken on the side of 40.4MHz.

여기에서 콘덴서(C3)는 결합용이다.Here, the capacitor C 3 is for coupling.

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.

제1도에서, RF 단간동조부(도시생략)에서 동조되어 믹서부(2)로 입력되는 RF입력신호는 OSC(1)의 발진주파수와 함께 B+전압으로 바이어스되는 믹서트랜지스터 (T1)에서 믹싱되어 IF신호로 변환출력된다.In FIG. 1, the RF input signal, which is tuned by the RF short-terminal tuning section (not shown) and input to the mixer section 2, is mixed in the mixer transistor T 1 which is biased to the B + voltage along with the oscillation frequency of the OSC 1. Is converted into an IF signal and output.

이러한 IF신호는 IF증폭부(4)의 증폭 트랜지스터(T2)와 증폭 신호대역을 결정하는 동조 콘덴서(C1)에 의해 증폭된 후 복동조부(5)에 입력된다.The IF signal is amplified by the amplifying transistor T 2 of the IF amplifier 4 and the tuning capacitor C 1 for determining the amplified signal band and then input to the demodulation section 5.

복동조부(5)에 입력된 IF신호는 동조코일(L1)과 동조콘덴서(C2)에 의해 제2a도의 (a)와 같은 대역의 영상중간주파수(41.25MHz)로 동조되고, 동조코일(L2)과 동조콘덴서(C4)에 의해 제2a도의 (b)와 같은 대역의 음성중간 주파수(45.75MHz )로 동조되어 복동조가 이루어지게 된다.The IF signal input to the double-tuning section 5 is tuned by the tuning coil L 1 and the tuning capacitor C 2 at the image intermediate frequency (41.25 MHz) of the band as shown in FIG. 2A (a), and the tuning coil ( L 2 ) and the tuning capacitor C 4 are tuned to the voice intermediate frequency (45.75 MHz) of the band as shown in FIG.

이와 같이 복동조부(5)에서 복동조된 IF신호는 트랩콘덴서(C5-C7)와 트랩코일 (L3)에 의해 40.4MHz 트랩부(3)를 거치게 되므로, 제2b도에서 보이고 있는 바와같이 영상중간주파수 하측의 40.4MHz대에 트랩이 걸린 IF 신호가 최종적으로 출력된다.In this way, the double-tuned IF signal from the double-tuning section 5 passes through the 40.4 MHz trap section 3 by the trap capacitor C 5 -C 7 and the trap coil L 3 , as shown in FIG. Similarly, the IF signal trapped in the 40.4MHz band below the video intermediate frequency is finally output.

따라서 본 고안은 서독 및 이태리를 포함하는 유럽 지역의 튜너의 IF특성 규격을 만족시킬 수 있는 효과가 나타나게 된다.Therefore, the present invention is effective to meet the IF characteristics of the tuner of the European region, including West Germany and Italy.

Claims (1)

RF입력신호를 IF신호로 변환하는 믹서부(2)와, 상기 믹서부(2)의 IF신호를 증폭하는 IF증폭부(4)와, 상기 IF증폭부(4)의 IF출력신호를 영상 IF동조회로 음성 IF동조회로를 통하여 복동조하는 복동조부(5)를 포함하는 튜너의 중간주파 회로에 있어서, 상기 복동조부(5)의 복동조 IF출력신호의 영상 IF하측에 영상 트랩을 걸어주는 동조 콘덴서(C5-C7) 및 동조 코일(L3)의 LC결합에 의한 40.4MHz트랩부(3)가 더 마련된 것을 특징으로 하는 튜너의 중간주파 출력회로.A mixer unit 2 for converting an RF input signal into an IF signal, an IF amplifier unit 4 for amplifying the IF signal of the mixer unit 2, and an IF output signal of the IF amplifier unit 4 for image IF. Tuning circuit An intermediate frequency circuit of a tuner comprising a double tuner 5 for double-tuning through an audio IF tuner circuit, wherein an image trap is applied to the lower side of the image IF of the double-tuned IF output signal of the double tuner 5. tuning capacitor (C 5 -C 7) and a tuning coil (L 3), the intermediate frequency output circuit of the tuner, characterized in that 40.4MHz trap portion 3 is further provided by a combination of LC.
KR2019880002513U 1988-02-27 1988-02-27 If output circuit for tuner KR930005289Y1 (en)

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KR2019880002513U KR930005289Y1 (en) 1988-02-27 1988-02-27 If output circuit for tuner

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Application Number Priority Date Filing Date Title
KR2019880002513U KR930005289Y1 (en) 1988-02-27 1988-02-27 If output circuit for tuner

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KR890018299U KR890018299U (en) 1989-09-09
KR930005289Y1 true KR930005289Y1 (en) 1993-08-11

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