KR940001483Y1 - Wide band input filter circuit of satellite broadcasting tuner - Google Patents

Wide band input filter circuit of satellite broadcasting tuner Download PDF

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Publication number
KR940001483Y1
KR940001483Y1 KR2019910021865U KR910021865U KR940001483Y1 KR 940001483 Y1 KR940001483 Y1 KR 940001483Y1 KR 2019910021865 U KR2019910021865 U KR 2019910021865U KR 910021865 U KR910021865 U KR 910021865U KR 940001483 Y1 KR940001483 Y1 KR 940001483Y1
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trap
input filter
frequency
filter circuit
tuner
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KR2019910021865U
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KR930016671U (en
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서형준
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삼성전기 주식회사
황선두
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/46—Networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/12—Bandpass or bandstop filters with adjustable bandwidth and fixed centre frequency

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Filters And Equalizers (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

내용 없음.No content.

Description

위성방송 튜너의 광대역 입력필터회로Broadband Input Filter Circuit of Satellite Broadcast Tuner

제1도는 제1도의 주파수 특성도.1 is a frequency characteristic diagram of FIG.

제2도는 본 고안의 회로도.2 is a circuit diagram of the present invention.

제3도는 본 고안의 주파수 특성도.3 is a frequency characteristic diagram of the present invention.

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

10 : 제1트랩부 20 : 제2트랩부10: first trap part 20: second trap part

30 : 제3트랩부 40 : 하이패스필터부30: third trap unit 40: high pass filter unit

D1-C3: 바랙터 다이오드 C1-C : 캐패시터D 1 -C 3 : Varactor diode C 1 -C: Capacitor

L1-L : 인덕터L 1 -L: Inductor

본 고안은 위성방송튜너의 수신 채널수 확장을 위한 위성방송튜너의 광대역 입력필터 회로에 관한 것이다.The present invention relates to a wideband input filter circuit of a satellite broadcast tuner for expanding the number of receive channels of a satellite broadcast tuner.

위성방송은 적도상공의 정지위성에서 10.9GHz-12GHz의 전자파를 지상으로 전송하고, 지상에서는 옥외의 저잡음 블록콘버터로 수신변환하여 옥내의 위성방송튜너에 1GHZ대의 방송신호를 전달하게 된다.Satellite broadcasting transmits 10.9GHz-12GHz electromagnetic waves from the stationary satellites over the equator to the ground, and converts them into low-noise block converters on the ground and transmits 1GHZ signals to the indoor satellite tuner.

통상 유럽 통신위성(ECS)밴드는 주파수대역이 10.95-11.7GHz이므로 이를 저잡음 블록 콘버터에서 10GHz의 발진주파수로 믹싱하면 950-1700MHz의 변환주파수가 얻어진다.In general, since the ECS band has a frequency band of 10.95-11.7 GHz, mixing the low frequency block converter with an oscillation frequency of 10 GHz yields a conversion frequency of 950-1700 MHz.

이러한 950-1700MHz의 1차변환 방송신호는 위성방송튜너에 입력되어 상기 대역의 입력필터를 거치게된다.The 950-1700 MHz primary conversion broadcast signal is input to the satellite broadcast tuner and passes through the input filter of the band.

그러나, 이와같은 유럽 통신위성밴드수신용 위성방송튜너로 유럽 Ku밴드를 커버할 수 없다.However, such a satellite broadcasting tuner for receiving European telecommunication satellite bands cannot cover the European Ku band.

그 이유는 Ku밴드가 11.7-12GHz 이므로 그의 1차변환주파수는 1700-2000MHz 대역이되기 때문에 기존의 ESC 밴드 전용튜너의 입력필터를 통과할수 없다.The reason is that Ku band is 11.7-12GHz, so its first conversion frequency is 1700-2000MHz, so it cannot pass through the input filter of the existing ESC band dedicated tuner.

따라서 위성방송을 전부 커버하기 위해서는 위성방송 튜너의 입력필터를 광대역화시키지 않으면 안된다.Therefore, in order to cover all the satellite broadcasts, the input filter of the satellite tuner must be widened.

제1도는 종래의 위성방송튜너의 입력필터회로구성을 보이고 있다.1 shows an input filter circuit configuration of a conventional satellite broadcast tuner.

여기에서는 저잡음 블록콘버터(LNB)(도시생략)의 1차변환주파수(이하 RF 입력 신호라칭하다)는 제1, 2트랩부(10,20)를 거쳐 출력되도록 설계하고 있다. 제1트랩부(10)는 바랙터다이오드(D1)와 레시오 조정용 커패시터(C3)로 구성되고 제2트랩부(20)는 상기 제1트랩부(10)와 다른 트랩주파수를 갖는 바랙터 다이오드( D2)와 레시오 조저용 커패시터(C4)로 구성된다.Here, the first-order conversion frequency (hereinafter referred to as RF input signal) of the low noise block converter LNB (not shown) is designed to be output via the first and second trap sections 10 and 20. The first trap part 10 includes a varactor diode D 1 and a capacitor for adjusting the ratio C 3 , and the second trap part 20 has a trap frequency different from that of the first trap part 10. It consists of a raptor diode (D 2 ) and a capacitor for a recipe adjustment (C 4 ).

이러한 제1, 2트랩부(10,20)에는 마이크로스트립라인으로 형성되는 인덕터(L1-L2)와 바이어스 저항(R1-R2)을 통한 튜닝전압(VT)이 인가되게 구성된다.The first and second trap parts 10 and 20 are configured to apply a tuning voltage V T through the inductors L 1- L 2 and the bias resistors R 1- R 2 formed as microstrip lines. .

여기에서 커패시터(C1-C5)는 커플링 용이고 커패시터(C2)는 전원 노이즈 방지용이이고 저항(R3, R4)은 바이어스용이다.Here, the capacitors C 1 -C 5 are easy to couple, the capacitors C 2 are for preventing power supply noise, and the resistors R 3 , R 4 are for biasing.

따라서 입력필터를 통과하는 RF 주파수는 튜닝전압(VT)의 크기에 따라 변화하는 제1,2트랩부(10,20)에 트랩되어 950-1750 MHz의 RF로 출력되게 된다.Therefore, the RF frequency passing through the input filter is trapped by the first and second trap units 10 and 20 that vary according to the size of the tuning voltage V T , and is output as RF of 950-1750 MHz.

제2도는 앞에서 설명한 기존의 입력필터에서 튜닝전압(VT)에 따라 변환하는 가변필터링 대역을 보이고 있다. 최소의 튜닝전압에 의한 필터링 대역은 a(950-1500MHz)로 최대의 튜닝전압에 의한 필터링 대역은 b(950-1750MHz)로 나타내고 있다.FIG. 2 shows a variable filtering band that converts according to the tuning voltage V T in the conventional input filter described above. The filtering band due to the minimum tuning voltage is a (950-1500 MHz) and the filtering band due to the maximum tuning voltage is indicated by b (950-1750 MHz).

그러므로 앞에서 설명한 바와같이 기존의 위성방송 튜너의 입력필터로는 유럽 Ku밴드방송을 커버할수 없게 된다.Therefore, as described above, the input filter of the existing satellite tuner cannot cover the European Ku-band broadcasting.

본 고안은 상기전제체 따라 전통신위성방송의 수신을 가능하게하는 위성방송 튜너의 광대역 입력필터회로를 제공함에 그 목적을 두고 있다.The present invention aims to provide a wideband input filter circuit of a satellite broadcast tuner that enables the reception of traditional satellite broadcasts according to the above system.

이하 첨부한 도면을 참고로하여 본 고안을 설명하면 다음과 같다.Hereinafter, the present invention will be described with reference to the accompanying drawings.

제3도는 본 고안의 회로 구서어도로써, 고역트랩용 제1,2트랩부(10,20)를 포함하는 기존의 입력필터에 2050MHz에 트랩포인트를 주기위한 제3트랩부(30)와 800MHz이하의 주파수를 커팅하기 위한 하이패스 필터부(40)를 더 추가하고 있다.3 is a circuit diagram of the present invention, and the third trap part 30 and 800 MHz or less for giving a trap point at 2050 MHz to an existing input filter including the first and second trap parts 10 and 20 for the high frequency trap. The high pass filter unit 40 for cutting the frequency of is further added.

또 상기 제3트랩부(30)에는 하이채널 이득특선 개선을 위하여 폭 0.3mm, 길이 2mm의 마이크로 스트립라인을 이용한 인덕터(L3)를 부가한다.In addition, an inductor L 3 using a micro strip line having a width of 0.3 mm and a length of 2 mm is added to the third trap part 30 to improve high channel gain characteristics.

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 RF입력신호가 커플링커패시터(C1)를 통하여 본 고안 입력 필터에 입력되면, RF신호는 제1-3트랩부(10-30) 및 하이패스필터부(40)를 거쳐 필터링 출력된다.In FIG. 3, when the RF input signal is input to the input filter of the present invention through the coupling capacitor C 1 , the RF signal is filtered through the 1-3 trap part 10-30 and the high pass filter part 40. Is output.

이때 상기 각각의 트랩부(10-30)에 포함된 각각의 바랙터 다이오드(D1-D3)에는 저항(R1, R2)과 마이크로스트립라인으로 형성된 인덕터(L1-L3)를 거친 튜닝 전압(VT)이 인가되는데, 튜닝전압(VT)이 높아지면 질수록 바랙터아디오(D1-D3)의 정전용량값은 줄어들게 되므로 각 트랩부(10-30)는 하이주파수 측 트랩주파수 쪽으로 이동하게 된다.At this time, each varactor diode D 1 -D 3 included in each of the trap units 10-30 includes inductors L 1- L 3 formed of resistors R 1 and R 2 and microstrip lines. The coarse tuning voltage (V T ) is applied, and as the tuning voltage (V T ) increases, the capacitance of the varactor audio (D 1 -D 3 ) decreases, so that each trap unit 10-30 has a high frequency. It moves to the side trap frequency.

제4도는 상기 튜닝전압(VT)의 변화폭을 0-22V까지 변화시킴에 따른 입력필터의 트랩주파수 이동을 보이고 있다.4 shows the trap frequency shift of the input filter as the variation range of the tuning voltage V T is changed to 0-22V.

여기에서 튜닝전압(VT)을 16-22V사이에서 변화시킬경우 제1트랩부(10)의 바랙터다이오드(D1) 및 커패시터(C3)와 제2트랩부(20)의 바랙터다이오드(D2) 및 커패시터(C4)의 레시오에 따라 입력필터의 트랩주파수는 1500-1750MHz 사이로 결정된다.In this case, when the tuning voltage V T is changed between 16 and 22 V, the varactor diode D 1 of the first trap part 10 and the varactor diode of the capacitor C 3 and the second trap part 20 are changed. The trap frequency of the input filter is determined to be between 1500 and 1750 MHz, depending on the ratio of (D 2 ) and capacitor (C 4 ).

따라서 제4도의 c-d사이의 저주파트랩 주파수 특성을 RF입력신호를 필터링하게 된다.Therefore, the RF input signal is filtered for the low frequency trap frequency characteristic between c-d of FIG.

또, 튜닝전압(VT)을 0-16V사이에서 변화시킬 경우 입력필터의 트랩주파수는 1750-2050MHz 사이로 결정된다. 결국 제4도의 d-e 사이의 고주파 트랩주파수 특성을 RF 입력신호를 필터링하게된다.Also, when the tuning voltage (V T ) is changed between 0-16V, the trap frequency of the input filter is determined between 1750-2050MHz. As a result, the RF input signal is filtered for the high frequency trap frequency characteristic between de in FIG.

한편 제3트랩부(30)는 스트립라인에 의한 인덕터(L3)와 함께 제4도의 c-d구간의 저주파구간에 트랩포인트를 만들어 이미지 및 OSC리키지 특성을 개선하게되며, 하이채널 이득특성을 보상하게 된다.On the other hand, the third trap unit 30, along with the inductor L 3 by the stripline, creates a trap point in the low frequency section of the cd section of FIG. 4 to improve the image and OSC package characteristics and compensates for the high channel gain characteristics. Done.

또한 인덕터(L4)와 커패시터(C6)에 의한 하이패스필터부(40)는 최종적으로 800MHz이하의 로우채널주파수를 차단하게 된다.In addition, the high pass filter unit 40 by the inductor L 4 and the capacitor C 6 finally cuts off the low channel frequency below 800 MHz.

이상에서 설명한바와같은 본 고안은 위성방송튜너의 입력필터를 2GHz대의 가변 필터링 대역으로 설계함에 따라 전위성방송수신을 가능하게하며, 특히 이미지 및 OSC리키지특성을 개선할수 있게된다.As described above, the present invention enables the design of the satellite TV tuner with a variable filtering band of 2 GHz to enable potential broadcast reception, and in particular, improve image and OSC package characteristics.

특히 본 고안에 사용되는 인덕터는 모두 마이크로스트립라인을 이용하여 만들어 줌으로써 필터링 주파수 특성을 안정화 시킬수있게 된다.In particular, all the inductors used in the present invention can be made by using microstrip lines to stabilize the filtering frequency characteristics.

Claims (1)

튜닝전압(VT)에 따라 트랩주파수가 가변되는 제1, 2 하이채널 주파수 트랩부(10,20)로 구성된 위성방송튜너의 입력필터회로에 있어서, 1500-1750MHz 구간의 저주파 트랩 포인트를 가지며 고주파 채널 이득 보상을 위한 마이크로스트립라인의 인덕터(L3) 및 바랙터 다이오드(D3)의 제3트랩부(30)와, 800MHz이하의 저주파수를 커팅하기 위한 인덕터(L4) 및 커패시터(C6)의 하이패스 필터부(40)를 더 포함하는 것을 특징으로 하는 위성방송 튜너의 광대역 입력필터회로.An input filter circuit of a satellite broadcasting tuner composed of first and second high channel frequency trap units 10 and 20 whose trap frequency is varied according to a tuning voltage V T , wherein the input filter circuit has a low frequency trap point of 1500-1750 MHz and has a high frequency. The third trap portion 30 of the inductor L 3 and varactor diode D 3 of the microstripline for channel gain compensation, the inductor L 4 and the capacitor C 6 for cutting low frequencies below 800 MHz Broadband input filter circuit of the satellite broadcast tuner, characterized in that it further comprises a high pass filter (40).
KR2019910021865U 1991-12-10 1991-12-10 Wide band input filter circuit of satellite broadcasting tuner KR940001483Y1 (en)

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Application Number Priority Date Filing Date Title
KR2019910021865U KR940001483Y1 (en) 1991-12-10 1991-12-10 Wide band input filter circuit of satellite broadcasting tuner

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KR930016671U KR930016671U (en) 1993-07-29
KR940001483Y1 true KR940001483Y1 (en) 1994-03-17

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