KR100276258B1 - Digital satellite broadcasting tuner - Google Patents

Digital satellite broadcasting tuner Download PDF

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Publication number
KR100276258B1
KR100276258B1 KR1019970023113A KR19970023113A KR100276258B1 KR 100276258 B1 KR100276258 B1 KR 100276258B1 KR 1019970023113 A KR1019970023113 A KR 1019970023113A KR 19970023113 A KR19970023113 A KR 19970023113A KR 100276258 B1 KR100276258 B1 KR 100276258B1
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South Korea
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intermediate frequency
ground
high frequency
coupling capacitor
capacitor
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KR1019970023113A
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Korean (ko)
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KR19990000301A (en
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서형준
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이형도
삼성전기주식회사
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H40/00—Arrangements specially adapted for receiving broadcast information
    • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
    • H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
    • H04H40/90—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for satellite broadcast receiving
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Circuits Of Receivers In General (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

PURPOSE: A digital satellite broadcasting tuner is provided to maintain constantly BER(bit error rate) although transponder is transformed from MCPC(multi-channel per carrier) mode to SCPC(single channel per carrier) mode by embodying intermediate frequency band pass filter from fixed to variable. CONSTITUTION: A coupling capacitor(C2) which is a fine control unit is settled between input terminal(i) and output terminal(o). A variable capacitor(C1) is settled between the ground and junction point of one side of the interval of the input terminal(i) and the coupling capacitor(C2). A synchronous inductor(L1) is settled between the ground and junction point of the other side of the interval of the input terminal(i) and the coupling capacitor(C2). A synchronous inductor(L2) is settled between the ground and junction point of one side of the interval of the coupling capacitor(C2) and the output terminal(o). A variable capacitor(C3) is settled between the ground and junction point of the other side of the interval of the coupling capacitor(C2) and the output terminal(o).

Description

디지털 위성방송 튜너Digital satellite tuner

본 발명은 디지털 위성방송 튜너에 관한 것으로, 특히 중간주파수대의 대역 통과필터를 고정형에서 가변형 필터로 구현하여 SCPC(Single Channel Per Carrier)채널의 신호를 수신시에도 BER(Bit Error Rate)을 나빠지지 않도록 하여, 항상 만족스런 BER(Bit Error Rate)을 얻을 수 있는 디지털 위성방송 튜너에 관한 것이다.The present invention relates to a digital satellite broadcasting tuner, and in particular, the band pass filter of the intermediate frequency band is implemented from a fixed to a variable filter so that the BER (Bit Error Rate) does not deteriorate even when a signal of the SCPC (Single Channel Per Carrier) channel is received. Therefore, the present invention relates to a digital satellite tuner that can always obtain a satisfactory bit error rate (BER).

일반적으로, 위성방송신호는 적도상공의 정지위성으로부터 전송되는 SHF대(SHF:super high frequency, 대략 10 ㎓대)의 초고주파 신호로서, 이 위성방송신호를 각 가정에 구비된 파라볼라 안테나로 접속하고 상기 파라볼라 안테나에 구비된 저잡음 주파수변환기(LNB:low noise blockdown converter)를 통해 공중파 방송신호 대역과 비슷한 UHF대(UHF:ultra high frequency, 대략 1 ㎓대)의 고주파신호로 변환하여, 상기 변환된 고주파신호가 위성방송튜너에 입력됨으로써 위성방송의 수신이 이루어진다.In general, a satellite broadcast signal is a super high frequency (SHF: super 10 frequency) signal transmitted from a stationary satellite over the equator, and the satellite broadcast signal is connected to a parabolic antenna provided in each home. A low noise blockdown converter (LNB) included in a parabola antenna converts the high frequency signal of a UHF band (UHF) into a high frequency signal similar to that of an airwave broadcasting signal band, thereby converting the converted high frequency signal. Is input to the satellite broadcast tuner to receive satellite broadcasts.

그리고, 상기 디지털 위성방송튜너의 일반적인 구성은 도1에 도시된 바와 같이 구성되는데, 도1를 참조하면, 종래 디지털 위성방송튜너는 안테나 및 LNB(Low Noise Blockdown Converter)로부터의 고주파(900∼2150㎒)를 증폭하는 제1고주파증폭부(101)와, 상기 증폭된 고주파 신호를 이득제어하는 고주파 자동이득제어부(102)와, 상기 이득 제어된 고주파 신호를 증폭하는 제2고주파증폭부(103)와, 상기 증폭된 고주파신호를 대역통과시키는 고주파대역통과필터(104)와, 발진부(106)의 발진주파수와 기준 주파수를 비교하여 위상차에 해당하는 값을 발진부(106)로 제공하고 상기 고주파대역통과필터(104)에 대역가변전압을 제공하는 위상동기루프(105)와, 상기 위상동기루프(105)에 의한 튜닝전압에 따라 발진주파수를 생성시키는 발진부(106)와, 상기 발진부(106)의 발진주파수를 증폭하여 혼합부(108)로 제공하는 발진증폭부(107)와, 상기 발진 주파수와 대역통과된 고주파 신호를 혼합하여 중간 주파수(479.5MHz)를 출력하는 혼합부(108)와, 상기 혼합부(108)로부터 출력된 중간 주파수를 이득제어하는 중간주파이득제어부(109)와, 상기 이득제어된 중간주파수를 증폭하는 제1증간주파증폭부(110)와, 상기 증폭된 중간 주파수를 대역통과시키는 중간 주파수대역통과필터(111)와, 상기 대역통과된 중간 주파신호를 증폭하는 제2중간주파 증폭부(112)와, 90°의 위상차를 갖는 베이스 밴드인 I/Q 신호를 출력하는 I/Q복조기(113)와, 자동이득제어(AGC)검출 전압을 상기 두 자동이득제어부(102)(109)로 제공하는 자동이득제어(AGC)(114)를 구비한다.In addition, the general configuration of the digital satellite broadcasting tuner is shown in FIG. 1. Referring to FIG. 1, the conventional digital satellite broadcasting tuner has a high frequency (900 to 2150 MHz) from an antenna and a low noise blockdown converter (LBN). A first high frequency amplifier 101 for amplifying a), a high frequency automatic gain control unit 102 for gain control of the amplified high frequency signal, a second high frequency amplifier 103 for amplifying the gain controlled high frequency signal, and The high frequency band pass filter 104 for band-passing the amplified high frequency signal and the oscillation frequency and the reference frequency of the oscillator 106 are compared to provide a value corresponding to a phase difference to the oscillator 106 and the high frequency band pass filter. A phase synchronous loop 105 for providing a band variable voltage to the 104, an oscillator 106 for generating an oscillation frequency according to the tuning voltage by the phase synchronous loop 105, and an oscillation frequency of the oscillator 106 To An oscillating amplifier 107 amplified and provided to the mixing unit 108, a mixing unit 108 for mixing the oscillation frequency and the bandpass high frequency signal to output an intermediate frequency (479.5 MHz), and the mixing unit ( An intermediate frequency gain control unit 109 for gain control of the intermediate frequency output from 108, a first amplification frequency amplifier 110 for amplifying the gain controlled intermediate frequency, and an intermediate band for passing the amplified intermediate frequency; A frequency bandpass filter 111, a second intermediate frequency amplifier 112 for amplifying the bandpassed intermediate frequency signal, and an I / Q demodulator for outputting an I / Q signal that is a baseband having a phase difference of 90 degrees. 113 and an automatic gain control (AGC) 114 which provides the automatic gain control (AGC) detection voltages to the two automatic gain control units (102) (109).

그런데, 상기와 같이 구성된 종래의 디지털위성방송 튜너에 의하면, 위성으로부터 송출되는 트렌스폰더들중, 아날로그 채널사이의 대역에 실려 들어오는, MCPC(Mutiple Channel Per Carrier)보다 좋은 대역폭을 갖는 SCPC(Single Channe1 Per Carrier)방식의 디지털채널을 수신시, BER(Bit Error Rate)이 악화되어, 수신효율이 떨어진다는 문제점이 발생한다.However, according to the conventional digital satellite broadcasting tuner configured as described above, of the transponders transmitted from the satellite, SCPC (Single Channe1 Per) having a better bandwidth than the MCPC (Mutiple Channel Per Carrier), which is carried in a band between analog channels. When receiving a Carrier-type digital channel, a bit error rate (BER) is deteriorated, resulting in a decrease in reception efficiency.

본 발명은 상기한 문제점을 해결하고 개선점을 달성하기 위해 제안된 것이다.The present invention has been proposed to solve the above problems and to achieve improvements.

따라서, 본 발명의 목적은 SCPC(Single Channel Per Carrier)방식의 트랜스 폰더를 수신하더라도 BER(Bit Error Rate)가 저하되지 않도록하여 항상 일정하고 만족스런 BER을 얻을 수 있도록 하는 디지털 위성방송 튜너를 제공하는데 있다.Accordingly, an object of the present invention is to provide a digital satellite broadcasting tuner that can always obtain a constant and satisfactory BER by preventing the bit error rate (BER) from being reduced even when receiving a single channel per carrier (SCPC) transponder. have.

도1은 종래의 디지털 위성방송튜너의 내부구성을 보이는 블록도이다.1 is a block diagram showing the internal structure of a conventional digital satellite broadcasting tuner.

도2는 본 발명에 의한 디지털 위성방송튜너의 내부구성을 보이는 블록도이다.Figure 2 is a block diagram showing the internal configuration of a digital satellite broadcast tuner according to the present invention.

도3는 본 발명에 의한 디지털 위성방송튜너의 중간 주파수 대역통과필터의 회로도이다.3 is a circuit diagram of an intermediate frequency bandpass filter of a digital satellite broadcasting tuner according to the present invention.

도4는 도3의 중간 주파수 대역통과필터의 대역폭을 도시한 그래프이다.FIG. 4 is a graph showing the bandwidth of the intermediate frequency bandpass filter of FIG.

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

101 : 제1고주파증폭부 102 : 고주파자동이득제어부101: first high frequency amplifier 102: high frequency automatic gain control unit

103 : 제2고주파증폭부 104 : 고주파대역통과필터103: second high frequency amplifier 104: high frequency band pass filter

105 : 위상동기루프 106 : 발진부105: phase synchronization loop 106: oscillation unit

107 : 발진증폭부 108 : 혼합부107: oscillation amplification section 108: mixing section

109 : 중간주파자동이득제어부 110 : 제1중간주파증폭부109: intermediate frequency automatic gain control unit 110: the first intermediate frequency amplifier

211 : 중간주파수대역통과필터 112 : 제2중간주파증폭부211: intermediate frequency band pass filter 112: second intermediate frequency amplifier

113 : I/Q복조기 114 : 자동이득제어(AGC)113: I / Q demodulator 114: Automatic gain control (AGC)

C1, C3 : 가변형커패시터 C2 : 커플링커패시터C1, C3: Variable Capacitor C2: Coupling Capacitor

L1, L2 : 동조용 인덕터L1, L2: Tuning Inductors

상기한 본 발명의 목적을 달성하기 위한 기술적인 수단으로써, 본 발명은 위성안테나에 의해 수신되고 주파수다운되어 입력되는 고주파 위성방송신호를 수신하여 중간주파신호로 변환하는 고주파(RF)단과, 상기 고주파(RF)단에서 출력되는 중간주파신호를 처리하여 베이스밴드의 I/Q신호로 복조출력하는 중간주파단으로 이루어지는 디지털위성방송튜너에 있어서, 선택된 채널이 MCPC인지 SCPC인지에 따라서 통과대역폭이 가변되어, 상기 고주파(RF)단으로부터 출력되는 중간주파신호를 대역통과시켜 인접신호를 제거하는 중간주파수대역통과필터를 포함하는 것을 특징으로 한다.As a technical means for achieving the above object of the present invention, the present invention is a high frequency (RF) stage for receiving a high frequency satellite broadcast signal received by the satellite antenna and input down frequency and converting it into an intermediate frequency signal, and the high frequency In the digital satellite broadcasting tuner consisting of an intermediate frequency stage that processes the intermediate frequency signal output from the (RF) stage and demodulates and outputs it to the baseband I / Q signal, the passband is varied depending on whether the selected channel is MCPC or SCPC. And an intermediate frequency band pass filter for band-passing the intermediate frequency signal output from the high frequency (RF) terminal to remove the adjacent signal.

이하, 본 발명에 의한 디지털 위성방송 튜너를 수행하기 위한 장치의 구성을 첨부한 도면을 참조하여 설명한다.Hereinafter, a configuration of an apparatus for performing a digital satellite broadcast tuner according to the present invention will be described with reference to the accompanying drawings.

도2는 본 발명에 의한 디지털 위성방송튜너의 내부구성을 보이는 블록도이고, 도3는 본 발명에 의한 디지털 위성방송튜너의 중간 주파수 대역통과필터의 회로도이다.2 is a block diagram showing an internal configuration of a digital satellite broadcast tuner according to the present invention, and FIG. 3 is a circuit diagram of an intermediate frequency bandpass filter of the digital satellite broadcast tuner according to the present invention.

본 발명에 의한 디지털 위성방송 튜너는 파라불라 안테나 및 LNB(Low Noise Blockdown Converter)에서 입력되는 고주파 신호를 증폭하는 제1고주파증폭부(101)와, 상기 증폭된 고주파 신호를 이득제어하는 고주파자동이득제어부(102)와, 상기 자동이득 제어된 고주파 신호를 증폭하는 제2고주파증폭부(103)와, 상기 증폭된 고주파신호를 대역통과시키는 고주파대역통과필터(104)와, 발진부(106)의 발진주파수와 기준 주파수를 비교하여 위상차에 해당하는 튜닝전압을 상기 발진부(106)로 제공하고, 상기 고주파대역통과필터(104)에 대역가변전압을 제공하는 위상동기루프(105)와, 상기 위상동기루프(105)에 의한 튜닝전압에 따라 발진주파수를 생성시키는 발진부(106)와, 상기 발진부(106)의 발진주파수를 증폭하여 혼합부(108)로 제공하는 발진증폭부(107)와, 상기 발진 추파수와 대역통과된 고주파 신호를 혼합하여 중간 주파수를 출력하는 혼합부(108)와, 상기 혼합부(108)로부터 출력된 중간 주파수를 이득제어하는 중간주파자동이득제어부(109)와, 상기 이득제어된 중간주파수를 증폭하는 제1중간주파증폭부(110)와, 상기 증폭된 중간 주파수를 대역통과시키는 중간주파수대역통과필터(111)와, 상기 증폭된 중간 주파수를 대역통과시키고, MCPC(Multi-Channel Per Carrier)에서 SCPC(Single Channel Per Carrier)로 트랜스폰더(transponder)가 전환시 SCPC(Single Channel Per Carrier)의 대역폭에 맞도록 통과대역폭을 가변하는 중간주파수대역통과필터(211)와, 상기 대역통과된 중간 주파 신호를 증폭하는 제2중간주파증폭부(112)와, 상기 제2중간주파증폭부(112)로부터 90°의 위상차를 갖는 베이스밴드인 I,Q 신호를 출력하는 I/Q복조기(113)와, 자동이득제어(AGC)검출 전압을 상기 두 자동이득제어부(102)(109)로 제공하는 자동이득제어(AGC)(114)로 구성된다.The digital satellite broadcasting tuner according to the present invention includes a first high frequency amplifier 101 for amplifying a high frequency signal input from a parabolic antenna and a low noise blockdown converter (LNB), and a high frequency automatic gain for controlling the amplified high frequency signal. Oscillation of the control unit 102, the second high frequency amplifier 103 for amplifying the automatically gain controlled high frequency signal, the high frequency band pass filter 104 for band-passing the amplified high frequency signal, and the oscillator 106 A phase synchronous loop 105 for providing a tuning voltage corresponding to a phase difference by comparing a frequency with a reference frequency to the oscillator 106 and providing a band variable voltage to the high frequency band pass filter 104, and the phase synchronous loop An oscillator 106 for generating an oscillation frequency according to the tuning voltage by 105, an oscillation amplifier 107 for amplifying the oscillation frequency of the oscillator 106 and providing it to the mixing unit 108, and the oscillation oscillation Suwa A mixing unit 108 for mixing the bandpass high frequency signal to output an intermediate frequency, an intermediate frequency automatic gain control unit 109 for gain controlling the intermediate frequency output from the mixing unit 108, and the gain-controlled intermediate A first intermediate frequency amplifier 110 for amplifying a frequency, an intermediate frequency bandpass filter 111 for bandpassing the amplified intermediate frequency, and amplified intermediate frequency for bandpass, and multi-channel per An intermediate frequency bandpass filter 211 for varying the passband to fit the bandwidth of the single channel per carrier (SCP) when the transponder is switched from a carrier to a single channel per carrier (SCP). A second intermediate frequency amplifier 112 for amplifying an intermediate frequency signal, and an I / Q demodulator 113 for outputting I, Q signals which are basebands having a phase difference of 90 ° from the second intermediate frequency amplifier 112. ) And before automatic gain control (AGC) detection It is configured in the automatic gain control (AGC) (114) of the two provided by the automatic gain control unit 102 (109).

상기 중간 주파수 대역통과필터(211)는 도3에 도시한 바와 같이, 입력단자(i)와 출력단자(o) 사이에 미세조정장치인 커플링 커패시터(C2)를 설치하고, 상기 입력단자(i)와 상기 커플링 커패시터(C2) 사이의 일측 접점과 접지 사이에 가변커패시터(C1)와 타측 접점과 접지 사이에 동조용 인덕터(L1)를 설치하고, 상기 커플링 커패시터(C2)와 상기 출력단자(o) 사이의 일측 접점과 접지 사이에 동조용 인덕터(L2)와 타측 접점과 접지 사이에 가변커패시터(C3)를 설치하여 구성할 수 있다.As shown in FIG. 3, the intermediate frequency bandpass filter 211 is provided with a coupling capacitor C2, which is a fine adjustment device, between the input terminal i and the output terminal o, and the input terminal i. ) And a tuning inductor (L1) between the variable capacitor (C1) and the other contact and ground between one contact and ground between the coupling capacitor (C2), and the coupling capacitor (C2) and the output terminal A variable capacitor C3 may be provided between the tuning inductor L2 and the other contact point and the ground between one contact point and the ground between (o).

이와 같이 구성된 본 발명에 의한 튜너의 동작을 첨부도면에 의거하여 하기에 상세히 설명한다. 도2는 본 발명에 의한 디지털 위성방송튜너의 내부구성을 보이는 블록도이고, 도3는 본 발명에 의한 디지털 위성방송튜너의 중간 주파수 대역통과필터의 회로도이고, 도4는 상기 도3의 중간 주파수 대역통과필터에서 가변되는 대역폭을 보이는 주파수 대 이득을 보이는 특성그래프이다.The operation of the tuner according to the present invention configured as described above will be described in detail below based on the accompanying drawings. Figure 2 is a block diagram showing the internal configuration of a digital satellite broadcast tuner according to the present invention, Figure 3 is a circuit diagram of the intermediate frequency bandpass filter of the digital satellite broadcast tuner according to the present invention, Figure 4 is the intermediate frequency of Figure 3 Characteristic graph showing frequency vs. gain with variable bandwidth in bandpass filter.

본 발명에 의한 디지털 위성방송튜너는 기본적인 동작이 종래 기술과 동일하지만, 도1에 도시한 종래의 중간주파수대역통과필터(111)는 쏘(SAW)필터와 같이 통과 대역폭이 일정하게 고정되어 있는 형태로서, 하나 또는 둘이상의 광대역 와이드 필터를 사용하여 대역폭이 좁은 SCPC 트랜스폰더에서 대역폭이 넓은 MCPC 트랜스폰더까지 모두 통과할 수 있도록 구성하고 있다. 그러나, 본 발명에 따른 디지털 위성방송튜너에 구비된 도2의 중간주파수대역통과필터(211)는 도3에 도시된 바와 같은 대역폭이 가변되는 대역폭가변형 필터이다.In the digital satellite broadcasting tuner according to the present invention, the basic operation is the same as in the prior art, but the conventional intermediate frequency bandpass filter 111 shown in FIG. 1 has a constant passband like the SAW filter. One or more broadband wide filters can be used to pass from a narrow-band SCPC transponder to a wide-band MCPC transponder. However, the intermediate frequency bandpass filter 211 of FIG. 2 provided in the digital satellite broadcasting tuner according to the present invention is a variable bandwidth bandwidth variable as shown in FIG.

상기 중간주파수대역통과필터(211)는 디지털위성방송튜너에서 수신하는 위성방송의 트랜스폰더(transponder)가 MCPC(Multi-Channel Per Carrier)에서 SCPC(Single Channel Per Carrier)로 전환되면, 좁은 대역폭(2㎒)을 요구하는 SCPC에 맞도록 도3의 가변커패시터(C1, C3)의 용량값을 크게 하면, 도4에 도시된 바와 같이 통과 대역폭은 2㎒로 좁아진다. 보다 미세한 조정은 커플링 커패시터(C2)의 용량을 이용하여 조정할 수 있다. 상기 중간주파수대역통과필터(211)는 상기 SPSC 트랜스폰더는 디지털채널로서, 사이드(side)밴드의 제거를 25dB 이상되도록 설계한다.The intermediate frequency bandpass filter 211 is a narrow bandwidth (2) when the transponder of the satellite broadcasting received from the digital satellite broadcasting tuner is switched from a multi-channel per carrier (MCPC) to a single channel per carrier (SCP). If the capacitance values of the variable capacitors C1 and C3 in Fig. 3 are made larger to fit SCPC requiring MHz, the passband is narrowed to 2 MHz, as shown in Fig. 4. Finer adjustments can be made using the capacitance of the coupling capacitor C2. The intermediate frequency bandpass filter 211 is designed such that the SPSC transponder is a digital channel so that sideband elimination is 25 dB or more.

본 발명에 참조된 도면에서 실질적으로 동일한 구성과 기능을 가진 구성요소들은 도1 및 도2에서 동일한 부호를 사용하였다.In the drawings referred to in the present invention, components having substantially the same configuration and function have the same reference numerals in FIGS. 1 and 2.

상술한 바와같은 본 발명에 따르면, 중간주파수대역통과필터를 고정형에서 가변형 필터로 구현함으로써, 대역폭을 가변시켜 트랜스폰더(transponder)가 MCPC(Multi-Channel Per Carrier)에서 SCPC(Sing1e Channel Per Carrier)으로 전환하더라도 BER(Bit Error Rate)을 일정하게 하여 만족스런 BER(Bit Error Rate)을 얻을 수 있는 효과가 있다.According to the present invention as described above, by implementing the intermediate frequency bandpass filter from a fixed to a variable filter, by varying the bandwidth of the transponder (transponder) from MCPC (Multi-Channel Per Carrier) to SCP1 (Sing1e Channel Per Carrier) Even if the switch has a constant bit error rate (BER), it is possible to obtain a satisfactory bit error rate (BER).

이상의 설명은 단지 본 발명의 일 실시예에 대한 설명에 불과하며, 본 발명은 그 구성과 기술적 사상의 범위내에서 다양한 변경 및 개조가 가능하다.The above description is merely a description of one embodiment of the present invention, the present invention is capable of various changes and modifications within the scope of the configuration and technical spirit.

Claims (2)

(정정) 위성안테나에 의해 수신되고 주파수다운되어 입력되는 고주파 위성방송신호를 수신하여 중간주파신호로 변환하는 고주파(RF)단과, 상기 고주파(RF)단에서 출력되는 중간주파신호를 처리하여 베이스밴드의 I/Q신호로 복조출력하는 중간주파단으로 이루어지는 디지털위성방송튜너에 있어서, 선택된 채널이 MCPC 채널에서 SCPC 채널로 전환시 통과대역폭이 디지털채널대역에 맞도록 좁아지며, 상기 고주파(RF)단으로부터 출력되는 중간주파신호를 대역통과시켜 인접신호를 제거하는 중간주파수대역통과필터(211)를 포함하는 것을 특징으로 하는 디지털 위성방송 튜너.(Correction) Baseband by processing a high frequency (RF) stage for receiving a high frequency satellite broadcast signal received by the satellite antenna and inputted down and converting it into an intermediate frequency signal, and processing the intermediate frequency signal output from the high frequency (RF) stage A digital satellite broadcast tuner comprising an intermediate frequency stage demodulating and outputting an I / Q signal, wherein the passband is narrowed to fit the digital channel band when the selected channel is switched from an MCPC channel to an SCPC channel. And an intermediate frequency band pass filter (211) for band-passing the intermediate frequency signal outputted from the band and removing adjacent signals. 제1항에 있어서, 상기 중간주파수대역통과필터(211)는 입력단자(i)와 출력단자(o)의 사이에 미세조정장치인 커플링캐패시터(C2)를 설치하고, 상기 입력단자(i)와 상기 커플링 캐패시터(C2) 사이의 일측 접점과 접지 사이에 가변커패시터(C1)와 타측접점과 접지사이에 동조용 인덕터(L1)를 설치하고, 상기 커플링 커패시터(C2)와 상기 출력단자(⒭ 사이의 일측 접점과 접지사이에 동조용 인덕터(L2)와 타측 접점과 접지 사이에 가변커패시터(C3)를 설치하여 구성됨을 특징으로 하는 디지털 위성방송 튜너.The intermediate frequency band pass filter 211 is provided with a coupling capacitor C2, which is a fine adjustment device, between the input terminal i and the output terminal o, and the input terminal i. A tuning capacitor (C1) and a tuning inductor (L1) between a ground capacitor (C1) and the other contact point and ground between one contact point and the ground between the coupling capacitor (C2) and the coupling capacitor (C2) and the output terminal ( Digital satellite broadcasting tuner characterized in that the tuning inductor (L2) between the contact between the ground and the variable capacitor (C3) is installed between the other contact and the ground between.
KR1019970023113A 1997-06-04 1997-06-04 Digital satellite broadcasting tuner KR100276258B1 (en)

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