KR960016126A - Fully tuned tuner for high frequency receiver - Google Patents

Fully tuned tuner for high frequency receiver Download PDF

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Publication number
KR960016126A
KR960016126A KR1019940028087A KR19940028087A KR960016126A KR 960016126 A KR960016126 A KR 960016126A KR 1019940028087 A KR1019940028087 A KR 1019940028087A KR 19940028087 A KR19940028087 A KR 19940028087A KR 960016126 A KR960016126 A KR 960016126A
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KR
South Korea
Prior art keywords
input
signal
tuner
booster
amplifier
Prior art date
Application number
KR1019940028087A
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Korean (ko)
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KR970007884B1 (en
Inventor
문준영
Original Assignee
이종수
엘지전자부품 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 이종수, 엘지전자부품 주식회사 filed Critical 이종수
Priority to KR1019940028087A priority Critical patent/KR970007884B1/en
Publication of KR960016126A publication Critical patent/KR960016126A/en
Application granted granted Critical
Publication of KR970007884B1 publication Critical patent/KR970007884B1/en

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Classifications

    • 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)
  • Circuits Of Receivers In General (AREA)

Abstract

안테나로 부터 수신되는 신호를 감지하여 약전계 입력시에는 마이크로 프로세서로 제어되는 부스터 증폭수단으로 증폭시켜 입력신호를 튜너입력단자에 인가함으로써 약전계 입력지역에서도 수신감도를 높여 선명한 화질을 구현할 수 있도록 한 고주파수신기의 전자동조튜너에 관한 것이다.When the signal received from the antenna is detected and the weak field is input, it is amplified by the booster amplification means controlled by the microprocessor, and the input signal is applied to the tuner input terminal to improve the reception sensitivity even in the weak field input area to realize clear picture quality. The present invention relates to a fully tuned tuner for a high frequency receiver.

특징적인 구성으로는 안테나로부터의 수신되는 신호의 전계수준을 감지하여 표준전계 이하일때는 약전계 신호 입력상태임을 감지하여 일정전압의 마이크로프로세서의 부스터스위칭 전압에 따라 동작하여 안테나로부터 수신되는 신호를 소정 이득으로 증폭하는 부스터증폭수단을 안테나로 부터 튜너 입력단자의 입력필터부로 이어지는 신호전송라인에 연결함에 있다.A characteristic configuration is to detect the electric field level of the signal received from the antenna, and to detect the weak electric field signal when it is below the standard electric field, and operate according to the booster switching voltage of the microprocessor of a certain voltage to obtain a predetermined gain from the antenna. The booster amplification means for amplifying the signal is connected to the signal transmission line from the antenna to the input filter part of the tuner input terminal.

Description

고주파수신기의 전자동조튜너Fully tuned tuner for high frequency receiver

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제2도는 본 발명에 의한 전자 동조 튜너 회로의 블럭도.2 is a block diagram of an electronic tuning tuner circuit according to the present invention.

Claims (5)

1차 필터링하여 일정대역 이상의 주파수신호만을 통과시키는 입력필터부와, 상기 입력필터부에서 출력되는 신호중에서 원하는 채널의 주파수만을 선택동조하는 입력동조부와, 사동이득제어(AGC)회로의 자동이득제어전압(Vagc)에 따라 안테나에서 입력된 전계강도를 특정의 이득으로 증폭하느 고주파증폭부와, 고주파증폭된 신호중 일정대역 이상의 주파수 충실도를 높이기 위해 2차 동조하는 고주파동조부와, 일정한 주파수신호를 발생시키는 국부발진부와, 상기 2차 동조된 고주파신호를 국부발진된 주파수와 합성하여 중간주파수 신호를 발생시키는 믹서부와, 합성된 중간주파수신호를 2차로 필터링하여 중간주파복조기로 출력하는 중간주파 필터부와, 안테나를 통해 수신되는 신호의 전계수준을 감지하여 표준전계 이상(60dBμ)에서는 동작하지 않거나 안테나 수신신호를 튜너입력단자의 입력필터부로 통과시키고, 약전계(표준 전계 이하 ; 50dBμ) 입력시에는(즉, AGC 전압이 최대이득상태 : 7V) 동작하여 약전계의 입력신호를 소 레벨로 증폭하여 튜너입력단자의 입력필터부로 인가하는 부스터증폭부로 구성된 것을 특징으로 하는 고주파 수신기의 전자동조 튜너.An input filter unit for first-pass filtering only a frequency signal of a predetermined band or more, an input tuning unit for selecting and tuning only a frequency of a desired channel among the signals output from the input filter unit, and an automatic gain control of an AGC circuit. Generates a high frequency amplifier that amplifies the electric field intensity input from the antenna to a specific gain according to the voltage (Vagc), a high frequency tuner that performs second-order tuning to increase frequency fidelity above a certain band among the high frequency amplified signals, and generates a constant frequency signal. A local oscillator, a mixer configured to generate the intermediate frequency signal by synthesizing the second tuned high frequency signal with a locally oscillated frequency, and an intermediate frequency filter unit to secondly filter the synthesized intermediate frequency signal and output the intermediate frequency demodulator to the intermediate frequency demodulator. Also, it detects the electric field level of the signal received through the antenna and does not operate above the standard electric field (60dBμ). When the antenna received signal is passed through the input filter part of the tuner input terminal and the weak electric field (below the standard electric field; 50dBμ) is input (that is, the AGC voltage is at maximum gain: 7V), the weak signal is amplified to a small level. And a booster amplifier unit applied to the input filter unit of the tuner input terminal. 제1항에 있어서, 상기 부스터증폭부는 외부로부터 유입되는 불안정한 신호들로부터 회로를 보호하기 위한 부스터보호부와, 마이크로 프로세서로 부터 공급되는 부스터스위칭 전압에 의해 안테나에서 입력되는 약전계신호를 소정의 이득으로 증폭하여 출력해내는 증폭부와, 상기 증폭부의 주파수통과 특성을 안정하게 하는 궤환부로 구성함을 특징으로 하는 고주파 수신기의 전자동조튜너.The booster amplifier of claim 1, wherein the booster amplifier is configured to boost a weak field signal input from the antenna by a booster protection unit for protecting a circuit from unstable signals introduced from the outside, and a booster switching voltage supplied from a microprocessor. And an amplifier for amplifying and outputting the amplifier, and a feedback unit for stabilizing the frequency passing characteristics of the amplifier. 제1항에 있어서, 상기 부스터증폭부는 낙뢰 차단용 인덕터와 직류 차단용 캐패시터와 과전류 제한용 인덕터로 된 부스터 보호부를 갖는 것을 특징으로 하는 고주파 수신기의 전자동조튜너.The tuner of claim 1, wherein the booster amplifier has a booster protection part including a lightning blocking inductor, a DC blocking capacitor, and an overcurrent limiting inductor. 제1항에 있어서, 상기 부스터증폭부는 안테나에서 입력되는 신호의 전계를 감지하기 위한 수단으로 사용되는 다이오드와, 마이크로 프로세서에서 인가되는 부스터 스위칭전압(Vbsw)에 의해 제어되고 약전계의 입력신호가 튜너의 필터입력부로 출력되는 것을 차단하는 스위칭용 트랜지스터와, 전류 제한용 저항들과, 상기 다이오드의 작동에 따라 입력신호를 증폭하는 트랜지스터와, 평활용 캐패시터와, 직류차단 및 커플링을 위한 캐패시터로 된 증폭부를 갖는 것을 특징으로 하는 고주파 수신기의 전자동조튜너.The method of claim 1, wherein the booster amplifier is controlled by a diode used as a means for sensing the electric field of the signal input from the antenna, and a booster switching voltage (Vbsw) applied from the microprocessor, the input signal of the weak field is tuner A switching transistor for blocking output from the filter input unit of the filter, current limiting resistors, a transistor for amplifying an input signal according to the operation of the diode, a smoothing capacitor, and a capacitor for DC blocking and coupling. Fully tuned tuner of the high frequency receiver, characterized in that it has an amplifier. 제1항에 있어서, 상기 부스터증폭부는 상기 트랜지스터의 베이스단자와 콜렉터단자 사이에 직렬로 연결되는 캐패시터와, 인덕터와, 저항으로 된 궤환부를 갖는 것을 특징으로 하는 고주파 수신기의 전자동조튜너.The tuner of claim 1, wherein the booster amplifier includes a capacitor connected in series between the base terminal and the collector terminal of the transistor, an inductor, and a feedback part of the resistor. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940028087A 1994-10-29 1994-10-29 Electronic tuner of high frequency receiver KR970007884B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019940028087A KR970007884B1 (en) 1994-10-29 1994-10-29 Electronic tuner of high frequency receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019940028087A KR970007884B1 (en) 1994-10-29 1994-10-29 Electronic tuner of high frequency receiver

Publications (2)

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KR960016126A true KR960016126A (en) 1996-05-22
KR970007884B1 KR970007884B1 (en) 1997-05-17

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KR1019940028087A KR970007884B1 (en) 1994-10-29 1994-10-29 Electronic tuner of high frequency receiver

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100223369B1 (en) * 1996-12-19 1999-10-15 윤종용 Apparatus and method for automatically contwlling gain in multic-channel communication system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100223369B1 (en) * 1996-12-19 1999-10-15 윤종용 Apparatus and method for automatically contwlling gain in multic-channel communication system

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KR970007884B1 (en) 1997-05-17

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