KR930006291Y1 - 2 input switching circuit - Google Patents
2 input switching circuit Download PDFInfo
- Publication number
- KR930006291Y1 KR930006291Y1 KR2019900018064U KR900018064U KR930006291Y1 KR 930006291 Y1 KR930006291 Y1 KR 930006291Y1 KR 2019900018064 U KR2019900018064 U KR 2019900018064U KR 900018064 U KR900018064 U KR 900018064U KR 930006291 Y1 KR930006291 Y1 KR 930006291Y1
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- South Korea
- Prior art keywords
- switching
- input signal
- diodes
- band
- voltage
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
- H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
- H03J5/242—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
- H03J5/244—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection using electronic means
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- 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)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Electronic Switches (AREA)
Abstract
내용 없음.No content.
Description
제1도는 본 고안의 회로도.1 is a circuit diagram of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
TR1: 스위칭 트랜지스터 D1-D5: 다이오드TR 1 : switching transistor D 1 -D 5 : diode
R1-R7: 저항 Vsw : 스위칭 전압R 1 -R 7 : Resistor Vsw: Switching Voltage
본 고안은 위성방송 수신용 BS 튜너의 입력 절환회로에 관한 것이다.The present invention relates to an input switching circuit of a BS tuner for satellite broadcasting reception.
일반적으로 위성방송 수신 시스템을 보면, 파라볼라안테나로 수신된 방송신호를 LNB로 저잡음 증폭한후 BS 튜너에서 방송선국이 되도록 구성되고 있다.In general, in the satellite broadcasting reception system, a low noise amplification of a broadcast signal received through a parabola antenna is performed on an LNB, and is configured to be a broadcasting station on a BS tuner.
이때 파라볼라 안테나에 설치되는 LNB는 위성방송국에서 송출한 원편파를 직선편파로 변환하게 되는데 R방송신호와 L 방송신호를 수신하기 위해서는 각각 별도의 LNB가 필요하게될 뿐만아니라, 상기 각각의 LNB에서 얻어진 신호를 증폭하는 RF앰프가 각각 소요된다. 따라서 BS튜너단의 회로구성이 복잡하게 되는 문제가 나타난다.In this case, the LNB installed in the parabola antenna converts the circular polarization transmitted by the satellite broadcasting station into linear polarization. In order to receive the R broadcast signal and the L broadcast signal, a separate LNB is required, and the LNB is obtained from each LNB. Each RF amplifier amplifies a signal. Therefore, the circuit configuration of the BS tuner stage becomes complicated.
본 고안은 각각의 LNB에서 얻어진 R 신호 및 L 신호를 BS 튜너에 입력시킬때 절환회로를 거쳐 입력되게 함으로써 RF앰프의 공용화에 따른 튜너의 초소형화 및 회로간소화를 가능하게 하는 BS튜너 입력절환회로를 제안한다.The present invention provides a BS tuner input switching circuit that enables miniaturization and miniaturization of the tuner according to the common use of the RF amplifier by inputting the R signal and the L signal obtained from each LNB to the BS tuner. Suggest.
이러한 본 고안은 스위칭 트랜지스터 및 다이오드에 의해 R 및 L 신호가 절환되어 튜너의 RF앰프로 입력되게 하고 상기 스위칭 트랜지스터는 사용자 선택에 따라 발생되는 마이콤의 제어 출력전압으로 스위칭되게 하는 것으로 구현하고 있다.The present invention is implemented by switching the R and L signals by the switching transistor and the diode to be input to the tuner RF amplifier and the switching transistor is switched to the control output voltage of the microcomputer generated according to the user's selection.
이하 첨부한 도면을 참고로하여 본 고안을 설명하면 다음과 같다.Hereinafter, the present invention will be described with reference to the accompanying drawings.
제1도에서 도시하고 있는 바와 같이, 밴드 1(R)의 입력신호를 스위칭 다이오드(D1, D2)를 순방향으로 통하여 RF앰프로 제공되게 연결하고 밴드2(L)의 입력신호는 스위칭 다이오드(D3,D4)를 역방향으로 통하여 콘덴서(C1)를 거친후 RF앰프로 제공되게 연결한다.As shown in FIG. 1, the input signal of the band 1 (R) is connected to the RF amplifier through the switching diodes D 1 and D 2 in the forward direction, and the input signal of the band 2 (L) is the switching diode. (D 3, D 4 ) through the condenser (C 1 ) through the reverse direction to be provided to the RF amplifier.
상기 각 스위칭 다이오드(D1)(D2)에는 각각 저항(R1)(R2)을 통한 회로동작 전압(B+)이 바이어스 전압으로 제공되게 연결한다.Each of the switching diodes D 1 and D 2 is connected such that a circuit operating voltage B + through the resistors R 1 and R 2 is provided as a bias voltage.
상기 스위칭 다이오드(D1,D2)를 거친 밴드 1입력신호는 저항(R3)과 다이오드(D5)와 저항(R6,R5)을 통하여 그라운드로 바이패스되게 연결하고, 상기 다이오드(D5)의 캐소드에는 저항(R7)을 통한 마이콤(도시생략)의 스위칭 전압(Vsw)이 역바이어스 전압으로 제공되게 연결한다. 저항(R7)을 통한 상기 스위칭 전압(Vsw)은 저항(R6,R5)을 거쳐 스위칭 트랜지스터(TR1)의 베이스 바이어스 전압으로 제공되게 연결하고, 밴드 2입력 신호는 저항(R4)과 스위칭 트랜지스터(TR1)를 거쳐 그라운드 바이패스 되게 연결하여 구성한다.The band 1 input signal passing through the switching diodes D 1 and D 2 is connected to the ground via the resistor R 3 , the diode D 5 , and the resistors R 6 and R 5 , and is connected to the ground. The cathode of D 5 ) is connected such that the switching voltage Vsw of a microcomputer (not shown) through the resistor R 7 is provided as a reverse bias voltage. The switching voltage Vsw through the resistor R 7 is connected to provide the base bias voltage of the switching transistor TR 1 via the resistors R 6 and R 5 , and the band 2 input signal is connected to the resistor R 4 . And ground bypass via the switching transistor TR 1 .
이와 같이 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.
제1도의 회로에 회로동작전압(B+)이 인가되면 이 전압은 저항(R1), 스위칭다이오드(D1,D2), 저항(R3), 다이오드(D5), 저항(R6,R5)으로 이루어지는 전류 통로를 흐르게 되므로 상기 스위칭 다이오드(D1,D2)가 온되어 밴드 1의 입력신호가 RF앰프로 전달된다.When the circuit operating voltage B + is applied to the circuit of FIG. 1, the voltage is applied to the resistor R 1 , the switching diodes D 1 and D 2 , the resistor R 3 , the diode D 5 , and the resistor R 6. Since the current path consisting of R 5 flows, the switching diodes D 1 and D 2 are turned on to transmit an input signal of band 1 to the RF amplifier.
이때 스위칭 트랜지스터(TR1)는 오프 상태이므로 스위칭 다이오드(D3,D4)의 애노드측에 저항(R2)을 통한 회로동작전압(B＋)이 인가되더라도 상기 스위칭 다이오드(D3,D4)는 오프 상태로 유지되기 때문에 밴드 2의 입력신호(R)가 블로킹된다.At this time, the switching transistor (TR 1) is in the off state because the switching diode (D 3, D 4) circuit operating voltage (B +) is applied even when the switching diode (D 3, D 4 through a resistance (R 2) to the anode side of ) Is kept off, so the input signal R of band 2 is blocked.
그러나, 마이콤에서 스위칭 전압(Vsw)이 발생되면 이 전압은 저항(R7)을 통하여 다이오드(D5)의 캐소드측에 역바이어스 전압으로 인가됨과 동시에 저항(R6,R5)을 통하여 스위칭 트랜지스터(TR1)의 베이스측에 바이어스 전압으로 제공되므로,상기 스위칭 다이오드(D1,D2)의 전류통로는 차단되고 상기 스위칭 다이오드(D3,D4)의 전류통로는 열리게 된다.However, when the switching voltage Vsw is generated in the microcomputer, the voltage is applied as the reverse bias voltage to the cathode side of the diode D 5 through the resistor R 7 and at the same time , the switching transistor through the resistors R 6 and R 5 . Since a bias voltage is provided on the base side of TR 1 , the current paths of the switching diodes D 1 and D 2 are blocked and the current paths of the switching diodes D 3 and D 4 are opened.
상기 스위칭 다이오드(D3,D4)의 전류통로는 회로동작 전압(B+)이 저항(R2), 스위칭 다이오드(D4,D3), 저항(R4), 스위칭 트랜지스터(TR1)의 콜렉터-에미터에 의해 형성된다.The current path of the switching diodes (D 3 , D 4 ) is a circuit operating voltage (B + ) is a resistor (R 2 ), switching diodes (D 4 , D 3 ), resistor (R 4 ), switching transistor (TR 1 ) Is formed by a collector-emitter.
따라서, 이때에는 밴드 2의 입력신호(L)가 스위칭 다이오드(D3,D4)와 콘덴서(C1)를 거쳐 RF앰프로 제공되게 된다.Therefore, at this time, the input signal L of the band 2 is provided to the RF amplifier via the switching diodes D 3 and D 4 and the capacitor C 1 .
즉, 스위칭 전압(Vsw)을 통하여 R입력신호와 L입력신호를 선택적으로 RF앰프로 전달할수 있게된다.That is, the R input signal and the L input signal can be selectively transmitted to the RF amplifier through the switching voltage Vsw.
이상에서 설명한 바와 같은 본 고안은 마이콤의 스위칭 전압으로 R입력신호 및 L입력신호를 선택적으로 공급할수 있게 되고 또한 간단한 구성을 가지게 되므로, 두 입력신호를 처리하기 위한 BS튜너의 초소형화 및 저가 제작을 가능하게 하는 특유의 효과가 나타나게 된다.As described above, the present invention can selectively supply the R input signal and the L input signal with the switching voltage of the microcomputer and has a simple configuration. Therefore, the BS tuner for processing the two input signals can be miniaturized and manufactured at low cost. The peculiar effect of enabling this is to be seen.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019900018064U KR930006291Y1 (en) | 1990-11-23 | 1990-11-23 | 2 input switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019900018064U KR930006291Y1 (en) | 1990-11-23 | 1990-11-23 | 2 input switching circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR920010625U KR920010625U (en) | 1992-06-17 |
| KR930006291Y1 true KR930006291Y1 (en) | 1993-09-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019900018064U KR930006291Y1 (en) | 1990-11-23 | 1990-11-23 | 2 input switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR930006291Y1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002040116A1 (en) * | 2000-11-18 | 2002-05-23 | Cha Ki Young | Rollerboard for road-skiing |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100550784B1 (en) * | 1998-12-07 | 2006-06-23 | 엘지전자 주식회사 | Received Signal Path Control Circuit in Mobile Communication Terminal |
-
1990
- 1990-11-23 KR KR2019900018064U patent/KR930006291Y1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002040116A1 (en) * | 2000-11-18 | 2002-05-23 | Cha Ki Young | Rollerboard for road-skiing |
Also Published As
| Publication number | Publication date |
|---|---|
| KR920010625U (en) | 1992-06-17 |
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