KR950003650Y1 - Interference wave cancelling circuit of satellite broadcasting receiver - Google Patents

Interference wave cancelling circuit of satellite broadcasting receiver Download PDF

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Publication number
KR950003650Y1
KR950003650Y1 KR2019910022514U KR910022514U KR950003650Y1 KR 950003650 Y1 KR950003650 Y1 KR 950003650Y1 KR 2019910022514 U KR2019910022514 U KR 2019910022514U KR 910022514 U KR910022514 U KR 910022514U KR 950003650 Y1 KR950003650 Y1 KR 950003650Y1
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South Korea
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band
mhz
input
mixer
satellite broadcasting
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KR2019910022514U
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Korean (ko)
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KR930016810U (en
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이효범
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삼성전기 주식회사
황선두
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/1607—Supply circuits
    • H04B1/1615—Switching on; Switching off, e.g. remotely
    • 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

Abstract

내용 없음.No content.

Description

위성방송 수신기의 방해파 제거회로Interference Cancellation Circuit of Satellite Broadcasting Receiver

제1도는 종래의 위성방송 튜너의 회로 구성도.1 is a circuit diagram of a conventional satellite tuner.

제2도는 제1도의 회로구성에 따른 입력필터의 필터링 특성도.2 is a filtering characteristic diagram of an input filter according to the circuit configuration of FIG.

제3도는 본 고안의 회로 구성도.3 is a circuit diagram of the present invention.

제4도는 본 고안의 입력필터의 필터링 특성도.4 is a filtering characteristic diagram of an input filter of the present invention.

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

20 : RF입력필터 22 : 트랩부20: RF input filter 22: trap part

24 : 가변 필터부 26 : 방해파 제거부24: variable filter unit 26: interference wave removing unit

본 고안은 위성방송 수신용 튜너에 관한 것으로, 특히 1차 믹서단의 전단에 광대역으로 설계되는 입력 RF필터의 고역 필터링시 저주파 대역의 고주파에 의한 고주파 특성 악화를 방지하기 위한 위성방송 수신기의 방해파 제거회로에 관한 것이다.The present invention relates to a tuner for receiving a satellite broadcast. In particular, in the high pass filtering of an input RF filter designed in a wide band in front of the first mixer stage, the interference of the satellite broadcast receiver to prevent the deterioration of the high frequency characteristics due to the high frequency in the low frequency band is eliminated. It is about a circuit.

최근 유럽 위성방송의 방송대역이 950-1750MHz에서 950-2050MHz로 확장됨에 따라 950-1750MHz 대역에 맞추어 설게된 기존의 위성방송 튜너로는 1750-2050MHz 대역의 방송신호를 수신할 수 없어 전유럽 위성방송을 커버할 수 없다.As the European satellite broadcasting band has been expanded from 950-1750MHz to 950-2050MHz, existing satellite tuners designed for the 950-1750MHz band cannot receive broadcast signals in the 1750-2050MHz band. Cannot cover.

따라서 대부분의 위성방송 튜너의 RF입력필터는 950-2050MHz의 광대역으로 설계되고 있다.Therefore, the RF input filter of most satellite tuners is designed with a bandwidth of 950-2050MHz.

제1도는 현재 사용되고 있는 위성방송 튜너의 RF단 회로구성도로써, RF 앰프(10)를 거친 950-2050MHz의 RF 입력신호는 입력필터(20)를 거쳐 믹서(30)에서 OSC(40)의 발진주파수에 믹싱된 후 IF 앰프(50)을 거쳐 IF 신호로 출력되게 구성되는데, 상기 입력필터(20)는 480MHz대의 트랩부(22)와 가변필터부(24)로 구성하여 480MHz이하의 불필요한 주파수를 트랩부(22)에서 제거되게 하고 950-2050MHz 대역의 RF 신호는 튜닝전압에 의해 그 필터링 대역폭이 변화하는 가변필터부(24)를 거쳐 믹서(30)로 제공되게 하고 있다.1 is an RF stage circuit diagram of a satellite broadcasting tuner currently in use, and the 950-2050 MHz RF input signal passing through the RF amplifier 10 is oscillated by the OSC 40 in the mixer 30 via the input filter 20. After mixing to the frequency and then output through the IF amplifier 50 to the IF signal, the input filter 20 is composed of the trap unit 22 and the variable filter unit 24 of the 480MHz band unnecessary frequency below 480MHz The RF signal in the 950-2050 MHz band is removed from the trap section 22 and provided to the mixer 30 through the variable filter section 24 whose filtering bandwidth is changed by the tuning voltage.

상기 트랩부(22)는 마이크로 스트립라인에 의한 인덕터(L1)와 콘덴서(C1)로써 480MHz하이패스 필터로 설계되고, 상기 가변필터부(24)는 마이크로 스트립라인(L2-L4)과 튜닝전압이 인가되는 바랙터 다이오드의 가변 콘덴서로써 상기 튜닝전압 크기에 따라서 950-1750MHz∼950-2050MHz 사이에서 필터링 대역이 이동하게 된다. 이를 제2도에 보이고 있다.The trap part 22 is designed as a 480 MHz high pass filter as an inductor L 1 and a capacitor C 1 by a micro strip line, and the variable filter part 24 is a micro strip line L 2 -L 4 . As a variable capacitor of the varactor diode to which the over-tuning voltage is applied, the filtering band is shifted between 950-1750 MHz and 950-2050 MHz according to the size of the tuning voltage. This is shown in FIG.

그러나 이와같은 기존의 RF입력필터를 이용하는 경우 하이밴드, 예를 들면 1900-2050MHz 대역을 수신할 때 950-1025MHz대의 주파수도 통과하게 되므로 950-1025MHz대의 고조파(950×2=1900MHz, 1025×2=2050MHz)가 발생하여 선택한 하이밴드(1900-2050)의 신호에 수신방해를 일으키는 문제점이 있었다.However, when using such a conventional RF input filter, when the high band, for example, the 1900-2050 MHz band is received, the frequencies of the 950-1025 MHz band also pass, so 950-1025 MHz harmonics (950 × 2 = 1900 MHz, 1025 × 2 =). 2050MHz) caused a disturbance in the signal of the selected high band (1900-2050).

본 고안의 목적은 상기한 문제점을 해결하기 위한 것으로써, 광역입력 RF 필터를 갖는 위성방송 튜너의 하이밴드 선택시 로우밴드의 고조파에 의한 혼신방해를 제거할 수 있는 위성방송 수신기의 방해파 제거회로를 제공하는데 있다.An object of the present invention is to solve the above-mentioned problems, and to solve the interference problem of a satellite broadcasting receiver which can eliminate interference caused by harmonics of low band when selecting a high band of a satellite broadcasting tuner having a wide input RF filter. To provide.

이하, 첨부한 도면을 참고로 하여 본 고안을 설명한다.Hereinafter, the present invention will be described with reference to the accompanying drawings.

제3도는 본 고안의 회로구성도로써 RF앰프(10)를 거친 950-2050MHz RF입력신호가 입력필터(20)를 통하여 믹서(30)에서 OSC(40)의 발진주파수에 의해 IF 신호로 출력되게 하고 있다.3 is a circuit diagram of the present invention to output a 950-2050MHz RF input signal through the RF amplifier 10 as an IF signal by the oscillation frequency of the OSC 40 in the mixer 30 through the input filter 20. Doing.

상기 입력필터(20)는 트랩부(22)와 가변필터부(24)와 방해파제거부(26)를 포함한다.The input filter 20 includes a trap 22, a variable filter 24, and a jamming block 26.

상기 트랩부(22)는 스트립 라인으로 형성되는 인덕터(L1)와 콘덴서에 의한 480MHz 트랩회로로 구성하고 상기 가변필터부(24)는 스트립 라인으로 형성되는 인덕터(L2-L4)와 튜닝 전압으로 용량값이 제어되는 바랙터 다이오드의 가변콘덴서(C2-C4)로 구성한다.The trap part 22 is composed of an inductor L 1 formed of a strip line and a 480 MHz trap circuit formed by a capacitor, and the variable filter part 24 is tuned with an inductor L 2 -L 4 formed of a strip line. It is composed of variable capacitors C 2 -C 4 of varactor diodes whose capacitance is controlled by voltage.

상기 방해파 제거부(26)는 상기 RF앰프(10)와 믹서(30)사이의 RF입력필터(20)에 콘덴서(C6, C7), 인덕터(L5) 및 스위칭 다이오드(D1)의 직렬회로에 의한 950-1025MHz의 낮은 RF밴드 트랩회로를 구성하고, 상기 스위칭 다이오드(D1)는 1900-2050MHz의 높은 RF밴드선택을 위한 높은 Vt 전압 입력시 스위칭 온되게 구성한 방해파 제거부(26)를 설치하여, 1900×2050MHz의 높은 밴드선택시 고조파 방해를 일으키는 950-1025MHz의 낮은 RF밴드를 제거한 RF신호를 믹서(30)로 제공하도록 구성한다.The interference canceling unit 26 includes a capacitor C 6 , C 7 , an inductor L 5 , and a switching diode D 1 in the RF input filter 20 between the RF amplifier 10 and the mixer 30. A low frequency band trap circuit of 950-1025 MHz by a series circuit and the switching diode D 1 are configured to be switched on at a high Vt voltage input for high RF band selection of 1900-2050 MHz. By installing the configuration, it is configured to provide an RF signal to the mixer 30 from which a low RF band of 950-1025 MHz, which causes harmonic interference when selecting a high band of 1900 × 2050 MHz, is provided.

이와같이 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.

제3도에서 RF앰프(10)를 거친 950-2050MHz의 RF입력신호가 입력필터(20)에 들어오면 트랩부(22)에 의해 불필요한 480MHz 이하의 주파수가 제거되고 가변 필터부(24)의 가변 콘덴서(24)에 의해 결정되는 패스밴드의 RF신호만 통과하게 된다.In FIG. 3, when an RF input signal of 950-2050 MHz passing through the RF amplifier 10 enters the input filter 20, unnecessary frequency below 480 MHz is removed by the trap unit 22 and the variable filter unit 24 is changed. Only the RF signal of the pass band determined by the capacitor 24 passes.

가령 필터링 대역중 로우밴드인 950-1025MHz 에서는 VT전압이 1-3V로 인가되며, 이 1-3V의 VT전압은 방해파 제거부(26)의 저항(R3, R4)에 의해 분배되어 스위칭 다이오드(D1)의 애노드측에 인가된다. 이때 상기 스위칭 다이오드(D1)의 캐소드측에는 12V의 B+ 전압이 저항(R1, R2)으로 분배되어 입력되므로 오프된다. 따라서 방해파 제거부(26)의 콘덴서(C5-C7) 및 인덕터(L5)에 의한 트랩회로는 형성되지 않게 되어, 상기 950-1025MHz의 RF신호는 믹서(30)으로 그대로 전달되게 된다.For example the filtering of the band of the low band 950-1025MHz and V T is applied to the 1-3V voltage, V T is the voltage of 1-3V is distributed by the resistors (R 3, R 4) of the interference removing section 26 It is applied to the anode side of the switching diode D 1 . At this time, since the B + voltage of 12V is divided into the resistors R 1 and R 2 and input to the cathode side of the switching diode D 1 , the switching diode D 1 is turned off. Therefore, the trap circuit by the capacitors C 5 -C 7 and the inductor L 5 of the interference removing unit 26 is not formed, and the RF signal of 950-1025 MHz is transmitted to the mixer 30 as it is.

한편, 1900-2025MHz의 RF 대역을 선택하는 경우에는 VT전압은 19-24V 이므로 이때에는 저항비(R1-R4)에 따라 상기 스위칭 다이오드(D1)가 온 되도록 설계하고 있기 때문에 스위칭 다이오드(D1)의 저항값은 거의 0에 가깝게 되어, 콘덴서(C6-C7) 및 인덕터(L)에 의한 950-1025MHz 저주파 트랩회로가 형성된다.In the case of selecting the RF band of 1900-2025MHz, since the V T voltage is 19-24V, the switching diode D 1 is designed to be turned on according to the resistance ratio R 1 -R 4 . The resistance value of (D 1 ) is almost zero, and a 950-1025 MHz low frequency trap circuit is formed by the capacitors C 6 -C 7 and the inductor L.

상기한 본 고안은 RF신호의 고주파 대역(1900-2050MHz)을 선택하는 경우에는 RF신호의 저주파 대역(950-1025MHz)이 제거되므로 낮은 RF신호의 고주파가 높은 RF신호에 영향하는 것을 방지할 수 있다.When the high frequency band (1900-2050MHz) of the RF signal is selected, the present invention can remove the low frequency band (950-1025MHz) of the RF signal, thereby preventing the high frequency of the low RF signal from affecting the high RF signal. .

따라서 상술한 바와같은 본 고안에 따르면 유럽형 광대역 위성방송 튜너에서 높은 RF밴드 선택시 낮은 RF밴드의 고조파 방해를 제거할 수 있게 되므로 튜너의 이미지 특성 및 인터모듈레이션 특성이 강화되는 우수한 효과가 있다.Therefore, according to the present invention as described above, it is possible to eliminate the harmonic interference of the low RF band when selecting a high RF band in the European broadband satellite tuner has an excellent effect that the image characteristics and intermodulation characteristics of the tuner is enhanced.

Claims (1)

RF앰프(10)를 통한 950-2050MHz RF입력신호를 480MHz트랩부(22)와 가변 필터부(24)로 이루어진 RF입력필터(20)에서 광대역 필터링하여 믹서(30)로 공급하는 위성방송 수신기의 방해파 제거회로에 있어서, 상기 RF앰프(10)와 믹서(30)사이의 RF 입력필터(20)에 콘덴서(C6, C7), 인덕터(L5) 및 스위칭 다이오드(D1)의 직렬회로에 의한 950-1025MHz의 낮은 RF 밴드트랩회로를 구성하고, 상기 스위칭 다이오드(D1)는 1900-2050MHz의 높은 RF 밴드 선택을 위한 높은 VT전압 입력시 스위칭 온되게 구성한 방해파 제거부(26)를 설치하며, 1900-2050MHz의 높은 RF밴드선택시 고조파 방해를 일으키는 950-1025Hz의 낮은 RF밴드를 제거한 RF 신호를 믹서(30)로 제공함을 특징으로 하는 위성방송 수신기의 방해파 제거회로.A satellite broadcasting receiver for 950-2050MHz RF input signal through the RF amplifier 10 by broadband filtering in the RF input filter 20 consisting of a 480MHz trap unit 22 and a variable filter unit 24 to supply to the mixer 30. In the interference wave elimination circuit, a series circuit of a capacitor (C 6 , C 7 ), an inductor (L 5 ) and a switching diode (D 1 ) is connected to an RF input filter 20 between the RF amplifier 10 and the mixer 30. A low RF band trap circuit of 950-1025 MHz is formed, and the switching diode (D 1 ) has a jamming block 26 configured to be switched on at a high V T voltage input for selecting a high RF band of 1900-2050 MHz. And a RF signal removing the low RF band of 950-1025 Hz, which causes harmonic interference when selecting a high RF band of 1900-2050 MHz, to the mixer (30).
KR2019910022514U 1991-12-17 1991-12-17 Interference wave cancelling circuit of satellite broadcasting receiver KR950003650Y1 (en)

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Application Number Priority Date Filing Date Title
KR2019910022514U KR950003650Y1 (en) 1991-12-17 1991-12-17 Interference wave cancelling circuit of satellite broadcasting receiver

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Application Number Priority Date Filing Date Title
KR2019910022514U KR950003650Y1 (en) 1991-12-17 1991-12-17 Interference wave cancelling circuit of satellite broadcasting receiver

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KR930016810U KR930016810U (en) 1993-07-29
KR950003650Y1 true KR950003650Y1 (en) 1995-05-09

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KR102206548B1 (en) * 2019-07-23 2021-01-22 엘지전자 주식회사 Satellite broadcasting receiver

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