KR970055343A - Improved tuner of satellite receiver - Google Patents

Improved tuner of satellite receiver Download PDF

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Publication number
KR970055343A
KR970055343A KR1019950056884A KR19950056884A KR970055343A KR 970055343 A KR970055343 A KR 970055343A KR 1019950056884 A KR1019950056884 A KR 1019950056884A KR 19950056884 A KR19950056884 A KR 19950056884A KR 970055343 A KR970055343 A KR 970055343A
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KR
South Korea
Prior art keywords
frequency
signal
oscillation
amplifying
oscillation frequency
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KR1019950056884A
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Korean (ko)
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KR0168205B1 (en
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장재선
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배순훈
대우전자 주식회사
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Priority to KR1019950056884A priority Critical patent/KR0168205B1/en
Publication of KR970055343A publication Critical patent/KR970055343A/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/44Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50Tuning indicators; Automatic tuning control
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03JTUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00Continuous tuning
    • H03J3/02Details
    • H03J3/06Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges
    • H03J3/08Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges by varying a second parameter simultaneously with the tuning, e.g. coupling bandpass filter
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/44Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/4446IF amplifier circuits specially adapted for B&W TV

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

본 발명은 위성수신기의 개선된 튜너에 관한 것으로, 제1 DRVCO에서 발생된 발진주파수가 제1 주파수 분주기를 통해 분주된 다음, 기준주파수 발진기로부터 제공되는 발진주파수 간의 위상차가 제1 위상검출부에서 검출되어 그 위상차에 따른 전압파형 중의 DC성분에 의거하여 제1 DRVCO로부터 발생되는 발진주파수가 일정하게 조절된다. 또한, 제2 DRVCO에서 발생된 발진주파수가 제2 주파수 분주기를 통해 분주된 다음, 기준주파수 발진기로부터 제공되는 발진주파수 간의 위상차가 제2 위상검출부에서 검출되어 그 위상차에 따른 전압파형 중의 DC성분에 의거하여 제2 DRVCO로부터 발생되는 발진주파수가 일정하게 조절되므로써, 제1 및 제2 DRVCO로부터 제공되는 안정된 발진주파에 의거하여 RF신호가 기저대역 신호로 튜닝되므로, 안정된 I성분과 Q성분을 디지탈 신호처리블럭으로 제공할 수 있도록 한 것이다.The present invention relates to an improved tuner of a satellite receiver, wherein an oscillation frequency generated in a first DRVCO is divided by a first frequency divider, and then a phase difference between an oscillation frequency provided from a reference frequency oscillator is detected in a first phase detector. Thus, the oscillation frequency generated from the first DRVCO is constantly adjusted based on the DC component in the voltage waveform according to the phase difference. In addition, after the oscillation frequency generated in the second DRVCO is divided through the second frequency divider, the phase difference between the oscillation frequencies provided from the reference frequency oscillator is detected by the second phase detector and applied to the DC component in the voltage waveform according to the phase difference. Based on the constant oscillation frequency generated from the second DRVCO, the RF signal is tuned to the baseband signal on the basis of the stable oscillation frequency provided from the first and second DRVCO, so that the stable I component and Q component are digital signals. It can be provided as a processing block.

Description

위성수신기의 개선된 튜너Improved tuner of satellite receiver

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 본 발명의 바람직한 실시예에 따른 위성수신기의 개선된 튜너에 대한 개략적인 블럭구성도.1 is a schematic block diagram of an improved tuner of a satellite receiver according to a preferred embodiment of the present invention.

Claims (1)

입력되는 RF신호 중에 상기 RF신호가 아닌 다른 신호를 필터링하기 위한 제1 필터링수단(105)과, 상기 제1 필터링수단(105)을 통해 필터링된 RF신호를 설정된 소정레벨로 증폭하기 위한 RF신호 증폭수단(110)과, 상기 RF신호 증폭수단(110)에서 증폭된 RF신호 중에 소망하는 채널에 상응하는 RF신호를 선택하기 위한 발진주파수를 발생하는 제1 발진수단(120)과, 상기 RF신호 증폭수단(110)에서 증폭된 RF신호와 상기 제1 발진수단(120)으로부터 제공되는 발진주파수를 혼합하여 제1 중간주파의 IF신호로 다운시키기 위한 제1 주파수 혼합수단(125)과, 상기 제1 주파수 혼합수단(125)을 통한 상기 제1 중간주파의 IF신호를 필터링하기 위한 제2 필터링수단(130)과, 상기 제2 필터링수단(130)에서 필터링된 상기 제1 중간주파의 IF신호를 소정레벨로 증폭하기 위한 제1 증폭수단(135)과, 상기 제1 증폭수단(135)에서 증폭된 상기 제1 중간주파의 IF신호를 제2 중간주파의 IF신호로 다운시키기 위한 발진주파수를 발생하는 제2 발진수단과, 상기 제1 증폭수단(135)에서 증폭된 상기 제1 중간주파의 IF신호와 상기 제2 발진수단으로부터 제공되는 발진주파수를 혼합하여 상기 제2 중간주파의 IF신호로 다운시키기 위한 제2 주파수 혼합수단과, 상기 제2 주파수 혼합수단을 통한 상기 제2 중간주파의 IF신호를 필터링하기 위한 제3 필터링수단(150)과, 상기 제3 필터링수단(150)을 통해 필터링된 상기 제2 중간주파의 IF신호를 소정레벨로 증폭시키기 위한 제2 증폭수단(155)과, 상기 제2 증폭수단(155)에서 증폭된 상기 제2 중간주파의 IF신호를 표면 탄성파 필터링하기 위한 SAW(160)와, 상기 SAW(160)를 통해 필터링된 상기 제2 중간주파의 IF신호를 기저대역 신호로 다운시키기 위한 발진주파수를 발생하는 제3 발진수단과, 상기 제3 발진수단으로부터의 발진주파수를 90°회전시키기 위한 위상천이수단(170)과, 상기 SAW(160)를 통해 필터링된 상기 제2 중간주파의 IF신호와 상기 위상천이수단(170)에서 90°회전된 발진주파수를 혼합하여 상기 기저대역 신호로 다운시키기 위한 제3 주파수 혼합수단(175)과, 상기 SAW(160)를 통해 필터링된 상기 제2 중간주파의 IF신호와 상기 제3 발진수단으로부터의 발진주파수를 혼합하여 상기 기저대역 신호로 다운시키기 위한 제4 주파수 혼합수단(180)과, 상기 제3 주파수 혼합수단(175)으로부터의 상기 기저대역 신호를 소정레벨로 증폭한 다음 I성분을 출력하는 제1 기저대역 증폭수단(185)과, 상기 제4 주파수 혼합수단(180)으로부터의 상기 기저대역 신호를 소정레벨로 증폭한 다음 Q성분을 출력하는 제2 기저대역 증폭수단(190)으로 이루어진 위성수신기의 튜너에 있어서, 상기 제2 및 제3 발진수단은 각각: 설정된 기준주파수의 발진주파수를 발생하는 기준주파수 발진수단(200); DC성분에 의거하여 조절되는 발진주파수를 발생하는 DRVCO(210,250); 상기 DRVCO(210,250)에서 발생되는 발진주파수를 소정 주파수별로 분주하기 위한 주파수 분주수단(220,260); 상기 기준주파수 발진수단(200)으로부터 제공되는 기준주파수의 발진주파수와 상기 주파수 분주수단(220,260)에서 분주된 발진주파수 간의 위상차를 검출하기 위한 위상검출수단(230,270); 상기 위상검출수단(230, 270)에서 검출된 위상차에 따른 전압파형 중에 상기 DC성분을 상기 DRVCO(210,250)로 제공하는 루프필터수단(240,280)으로 구성된 것을 특징으로 하는 위성수신기의 개선된 튜너.RF signal amplification for amplifying the RF signal filtered by the first filtering means 105 for filtering other signals other than the RF signal among the input RF signals to the predetermined predetermined level Means (110), first oscillating means (120) for generating an oscillation frequency for selecting an RF signal corresponding to a desired channel among the RF signals amplified by the RF signal amplifying means (110), and the RF signal amplification A first frequency mixing means 125 for mixing down the RF signal amplified by the means 110 and the oscillation frequency provided from the first oscillating means 120 to down to the IF signal of the first intermediate frequency; The second filtering means 130 for filtering the IF signal of the first intermediate frequency through the frequency mixing means 125 and the IF signal of the first intermediate frequency filtered by the second filtering means 130 are predetermined. First amplification means 135 for amplifying to a level Second oscillating means for generating an oscillation frequency for downgrading the IF signal of the first intermediate frequency amplified by the first amplifying means 135 to the IF signal of the second intermediate frequency, and the first amplifying means 135 A second frequency mixing means for mixing the IF signal of the first intermediate frequency amplified by the oscillation frequency and the oscillation frequency provided from the second oscillating means and down to the IF signal of the second intermediate frequency; A third filtering means 150 for filtering the IF signal of the second intermediate frequency through the means, and amplifying the IF signal of the second intermediate frequency filtered through the third filtering means 150 to a predetermined level A second amplifying means 155 for filtering, an SAW 160 for surface acoustic wave filtering the IF signal of the second intermediate frequency amplified by the second amplifying means 155, and filtered through the SAW 160. The IF signal of the second intermediate frequency is a baseband signal Third oscillating means for generating an oscillation frequency for down, phase shifting means 170 for rotating the oscillation frequency from the third oscillating means by 90 °, and the second intermediate filtered through the SAW 160; A third frequency mixing means 175 for mixing the IF signal of the frequency and the oscillation frequency rotated by 90 ° in the phase shifting means 170 to down to the baseband signal, and the SAW 160 filtered through The fourth frequency mixing means 180 and the third frequency mixing means 175 for mixing the IF signal of the second intermediate frequency and the oscillation frequency from the third oscillating means to down to the baseband signal. A first baseband amplifying means 185 for amplifying a baseband signal to a predetermined level and then outputting an I component, and amplifying the baseband signal from the fourth frequency mixing means 180 to a predetermined level and then Q component To In a second tuner of the satellite receiver comprising a baseband amplifier means 190 to force the second and third oscillation means, respectively: reference frequency oscillator means (200) for generating an oscillation frequency of a predetermined reference frequency; DRVCOs 210 and 250 for generating an oscillation frequency adjusted based on a DC component; Frequency dividing means (220,260) for dividing the oscillation frequency generated by the DRVCO (210,250) for each predetermined frequency; Phase detection means (230,270) for detecting a phase difference between the oscillation frequency of the reference frequency provided from the reference frequency oscillation means (200) and the oscillation frequency divided by the frequency division means (220,260); And a loop filter means (240,280) for providing the DC component to the DRVCO (210,250) in the voltage waveform according to the phase difference detected by the phase detection means (230, 270). ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950056884A 1995-12-26 1995-12-26 Improved tuner of satellite receiver KR0168205B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019950056884A KR0168205B1 (en) 1995-12-26 1995-12-26 Improved tuner of satellite receiver

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Application Number Priority Date Filing Date Title
KR1019950056884A KR0168205B1 (en) 1995-12-26 1995-12-26 Improved tuner of satellite receiver

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KR970055343A true KR970055343A (en) 1997-07-31
KR0168205B1 KR0168205B1 (en) 1999-03-20

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KR1019950056884A KR0168205B1 (en) 1995-12-26 1995-12-26 Improved tuner of satellite receiver

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