KR970055344A - Improved tuner of satellite receiver - Google Patents

Improved tuner of satellite receiver Download PDF

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Publication number
KR970055344A
KR970055344A KR1019950056885A KR19950056885A KR970055344A KR 970055344 A KR970055344 A KR 970055344A KR 1019950056885 A KR1019950056885 A KR 1019950056885A KR 19950056885 A KR19950056885 A KR 19950056885A KR 970055344 A KR970055344 A KR 970055344A
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KR
South Korea
Prior art keywords
signal
frequency
amplifying
oscillation
intermediate frequency
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KR1019950056885A
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Korean (ko)
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KR0168204B1 (en
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장재선
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배순훈
대우전자 주식회사
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Priority to KR1019950056885A priority Critical patent/KR0168204B1/en
Publication of KR970055344A publication Critical patent/KR970055344A/en
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Publication of KR0168204B1 publication Critical patent/KR0168204B1/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 DRVCO와 제2 DRVCO에서 각각 발생된 발진주파수 간의 위상차가 위상검출부에서 검출되고, 위상검출부에서 검출된 위상차에 따른 전압파형 중의 DC 성분에 의거하여 제1 DRVCO와 제2 DRVCO로부터 동일하고 안정된 발진주파수가 발생되어 제2 주파수 혼합부, 위상천이기 및 제4 주파수 혼합부로 각각 제공되므로써, 제1 및 제2 DRVCO로부터 제공되는 동일하고 안정된 발진주파수에 의거하여 RF신호가 기저대역 신호로 튜닝되므로, 안정된 I 성분과 Q 성분을 디지탈 신호 처리블럭으로 제공할 수 있도록 한 것이다.The present invention relates to an improved tuner of a satellite receiver, wherein a phase difference between an oscillation frequency generated in each of a first DRVCO and a second DRVCO is detected in a phase detector and based on a DC component in a voltage waveform according to the phase difference detected in the phase detector. The same stable oscillation frequency is generated from the first DRVCO and the second DRVCO and provided to the second frequency mixer, the phase shifter and the fourth frequency mixer, respectively, thereby providing the same stable oscillation frequency provided from the first and second DRVCOs. The RF signal is tuned to the baseband signal according to the present invention, so that stable I and Q components can be provided to the digital signal 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 발전수단(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), 상기 제2 필터링수단(130)에서 필터링된 상기 제1 중간주파의 IF신호를 소정레벨로 증폭하기 위한 제1 증폭수단(135)과, 상기 제2증폭수단(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 혼합수단(145)과, 상기 제2 주파수 혼합수단(145)을 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 Q 성분을 출력하는 제2 기저대역 증폭수단(190)으로 이루어진 위성수신기의 튜너에 있어서,상기 제2 및 제 3 발진수단은: DC 성분에 의거하여 조절되는 발진주파수를 각각 발생하는 제1 및 제2 DRVCO(200, 210); 상기 제1 DRVCO(200)에서 발생되는 발진주파수를 일측단으로 입력하고 상기 제2 DRVCO(210)에서 발생되는 발진주파수를 타측단으로 입력하여 상기 두 발진주파수 간의 위상차를 검출하기 위한 위상검출수단(220); 상기 위상검출수단(220)에서 검출된 위상차에 따른 전압파형 중에 상기 DC 성분을 상기 제1 및 제2 DRVCO(200, 210)로 제공하는 루프필터수단(230)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 power generating means 120 and down to the IF signal of the first intermediate frequency; 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 at a predetermined level. A first amplification means 135 for amplifying with; Second oscillating means for generating an oscillation frequency for downgrading the IF signal of the first intermediate frequency amplified by the second amplifying means 135 to the IF signal of the second intermediate frequency, and the first amplifying means 135 Second frequency mixing means 145 for mixing the IF signal of the first intermediate frequency amplified by the oscillation frequency provided from the second oscillating means and down to the IF signal of the second intermediate frequency; The third filtering means 150 for filtering the IF signal of the second intermediate frequency through the frequency mixing means 145, and the IF signal of the second intermediate frequency filtered through the third filtering means 150 A second amplifying means 155 for amplifying to a predetermined level, a SAW 160 for surface acoustic wave filtering the IF signal of the second intermediate frequency amplified by the second amplifying means 155, and the SAW 160 Baseband the IF signal of the second intermediate frequency filtered through A third oscillation means for generating an oscillation frequency for bringing down the call, a phase shifting means 170 for rotating the oscillation frequency from the third oscillation means by 90 °, and the second filtered through the SAW 160; A third frequency mixing means 175 for mixing the IF signal of the intermediate frequency and the oscillation frequency rotated by 90 ° in the phase shifting means 170 to down to the baseband signal, and filtered through the SAW 160. 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 oscillation means and down to the baseband signal. First baseband amplifying means 185 for amplifying the 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 castle In the tuner of the satellite receiver comprising a second baseband amplifying means 190 for outputting, The second and third oscillating means is: First and second DRVCO for generating an oscillation frequency adjusted based on the DC component, respectively 200, 210; Phase detection means for detecting the phase difference between the two oscillation frequencies by inputting the oscillation frequency generated by the first DRVCO (200) to one end and the oscillation frequency generated by the second DRVCO (210) to the other end ( 220); And a loop filter means 230 which provides the DC component to the first and second DRVCOs 200 and 210 among the voltage waveforms according to the phase difference detected by the phase detection means 220. Improved tuner. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950056885A 1995-12-26 1995-12-26 Improved tuner of satellite receiver KR0168204B1 (en)

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Application Number Priority Date Filing Date Title
KR1019950056885A KR0168204B1 (en) 1995-12-26 1995-12-26 Improved tuner of satellite receiver

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Application Number Priority Date Filing Date Title
KR1019950056885A KR0168204B1 (en) 1995-12-26 1995-12-26 Improved tuner of satellite receiver

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KR970055344A true KR970055344A (en) 1997-07-31
KR0168204B1 KR0168204B1 (en) 1999-03-20

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