KR0137021Y1 - Harmonic Rejection Circuit of Satellite Broadcast Tuner - Google Patents
Harmonic Rejection Circuit of Satellite Broadcast Tuner Download PDFInfo
- Publication number
- KR0137021Y1 KR0137021Y1 KR2019930025152U KR930025152U KR0137021Y1 KR 0137021 Y1 KR0137021 Y1 KR 0137021Y1 KR 2019930025152 U KR2019930025152 U KR 2019930025152U KR 930025152 U KR930025152 U KR 930025152U KR 0137021 Y1 KR0137021 Y1 KR 0137021Y1
- Authority
- KR
- South Korea
- Prior art keywords
- intermediate frequency
- saw filter
- circuit
- harmonic
- satellite broadcast
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/04—Frequency selective two-port networks
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Noise Elimination (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
본 고안은 위성방송 수신용 튜너의 고조파제거회로에 관한 것으로 중간주파수(480MHz)를 발생시키는 쏘필터회로는 자체특성중에 2차 고조파'(960MHz)성분이 내재하고 있으므로 상기 2차 고조파성분이 FM 복조단으로 입력되어 화면상에 비트로 나타나는 문제점을 해결하기 위하여 위성방송튜너의 FM 복조단 트랩회로를 구성하여 쏘필터에 의해 발생하는 2차 고조파성분을 제거할 수 있게 되었다.The present invention relates to a harmonic rejection circuit of a tuner for satellite broadcasting reception. Since the saw filter circuit generating an intermediate frequency (480 MHz) has a second harmonic '(960 MHz) component in its characteristics, the second harmonic component is FM demodulation. In order to solve the problem of being input into the stage and appearing on the screen, the FM demodulation stage trap circuit of the satellite broadcasting tuner can be configured to remove the second harmonic component generated by the saw filter.
Description
제1도는 종래의 위성방송튜너의 개략구성도.1 is a schematic configuration diagram of a conventional satellite broadcast tuner.
제2도는 본 고안의 위성방송튜너의 고조파제거회로도.2 is a harmonic rejection circuit diagram of the satellite broadcast tuner of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
10 : 고주파(RF) 증폭기 20 : 쏘필터(SAW FILTER)회로10: RF amplifier 20: SAW FILTER circuit
30 : 중간주파수(IF) 증폭기 35 : 트랩(TRAP)회로30: IF amplifier 35: Trap circuit
40 : FM 복조단40: FM demodulation unit
본 고안은 위성방송수신용 튜너의 고조파(HARMONIC) 제거회로에 관한 것으로, 좀더 상세하게는 위성 방송 수신용튜너의 쏘필터회로에 의해 발생되는 고조파성분을 제거하는 위성방송튜너의 고조파제거회로에 관한 것이다.The present invention relates to a harmonic cancellation circuit of a satellite broadcasting tuner, and more particularly, to a harmonic rejection circuit of a satellite broadcasting tuner for removing harmonic components generated by a saw filter circuit of a satellite broadcasting receiving tuner. will be.
일반적으로 위성방송은 적도상공의 정지위성에서 10.95GHz-12.2GHz의 전파를 전송하고, 상기 방송위성(BS)인 정지위성에서 전송되는 SHF 밴드의 방송신호는 옥외의 파라폴라안테나로 수신되고, 상기 수신된 방송신호는 파라폴라안테나에 부착된 저잡음 블록다운 컨버터(LNB)에서 UHF 밴드의 신호(950MHz-2050MHz)로 변환되고, 상기 변환된 고주파신호는 케이블을 통해 일반가정의 옥내에 설치된 위성방송수신기에 부속된 위성방송튜너에 공급된다.In general, satellite broadcasting transmits radio waves of 10.95 GHz-12.2 GHz in a geostationary satellite over the equator, and a broadcast signal of an SHF band transmitted from a geostationary satellite (BS) is received by an outdoor parapolar antenna. The received broadcast signal is converted into a UHF band signal (950MHz-2050MHz) by a low noise block down converter (LNB) attached to a parapolar antenna, and the converted high frequency signal is installed in a indoor broadcast receiver through a cable. It is supplied with the satellite broadcast tuner attached.
상기 위성방송튜너는 UHF 밴드의 신호를 480MHz대역의 중간주파수(IF)로 변환하고, 상기 중간주파수는 FM 복조단에서 베이스밴드의 신호로 복조되어 출력된다.The satellite broadcast tuner converts a signal of the UHF band into an intermediate frequency (IF) of the 480 MHz band, and the intermediate frequency is demodulated and output as a baseband signal by an FM demodulator.
종래의 위성방송튜너는 제1도와 같은 개략적인 구성을 갖는다.The conventional satellite broadcast tuner has a schematic configuration as shown in FIG.
안테나에 수신된 고주파신호는 고주파증폭기(10)에서 증폭되고 대역통과필터(BPF)인 쏘필터(20)에서 중간주파수로 변환되어 출력된다.The high frequency signal received by the antenna is amplified by the high frequency amplifier 10 and converted into an intermediate frequency by the saw filter 20 which is a band pass filter BPF.
상기 중간주파수는 중간주파수증폭기(30)에서 증폭되어 FM 복조단(40)에서 베이스밴드(BASE BAND)의 신호로 복조되어 출력된다.The intermediate frequency is amplified by the intermediate frequency amplifier 30 and demodulated by a signal of a base band (BASE BAND) by the FM demodulator 40.
상기와 같은 종래의 위성방송튜너의 쏘필터(SAW FILTER)가 중간주파수를 발생시키는데 있어 조정과정이 없는 편리한점과 상호인접채널 간섭비가 우수하다는 점이 있다.The SAW FILTER of the conventional satellite broadcast tuner as described above has an advantage of having no adjustment process and excellent mutual channel interference ratio in generating an intermediate frequency.
그러나 중간주파수(480MHz)를 발생시키는 쏘필터 회로는 자체특성중에 2차고조파(960MHz) 성분이 내재하고 있으므로 상기 2차 고조파성분이 FM 복조단으로 입력되어 화면상이 비트(BEAT)로 나타나는 문제점이 있었다.However, since the second harmonic (960MHz) component is inherent in the saw filter circuit which generates the intermediate frequency (480MHz), the second harmonic component is input to the FM demodulation stage, resulting in a bit on the screen. .
본 고안은 상기와 같은 종래의 위성방송튜너의 문제점을 해결하기 위하여 이루어진 것으로, 위성방송튜너의 FM 복조단 앞단에 트랩회로를 구성하여 쏘필터에 의해 발생되는 2차 고조파성분을 제거하는 위성방송 튜너의 고조파제거회로를 제공하는데 본 고안의 목적이 있다.The present invention has been made to solve the problems of the conventional satellite broadcast tuner as described above, by constructing a trap circuit in front of the FM demodulation stage of the satellite broadcast tuner to remove the second harmonic component generated by the saw filter It is an object of the present invention to provide a harmonic rejection circuit of the present invention.
이하 첨부한 도면을 참고로 하여 본 고안에 대해 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
제2도에 있어서, 안테나에 수신되는 고주파신호를 증폭하는 고주파증폭기(10)와, 상기 고주파증폭기(10)의 출력단에 연결되어 중간주파수(IF)를 발생시키는 쏘필터회로(20)와, 상기 쏘필터회로(20)의 출력단에 연결되어 상기 중간주파수를 증폭하는 중간주파수 증폭기(30) 와, 상기 중간주파수 증폭기(30)의 출력단에 연결되어 상기 쏘필터(20)의 자체특성상 발생되는 2차 고조파를 제거하기 위하여 코일(L1)과 콘덴서(C1)로 구성한 트랩회로(35)와, 상기 트랩회로의 출력단에 연결되어 베이스밴드신호를 출력하는 FM 복조단(40)으로 이루어진 것을 특징으로 한다.2, a high frequency amplifier 10 for amplifying a high frequency signal received by an antenna, a saw filter circuit 20 connected to an output terminal of the high frequency amplifier 10 to generate an intermediate frequency IF, and An intermediate frequency amplifier 30 connected to an output terminal of the saw filter circuit 20 to amplify the intermediate frequency, and a second order connected to an output terminal of the intermediate frequency amplifier 30 and generated due to its own characteristics of the saw filter 20. In order to remove harmonics, a trap circuit 35 composed of a coil L 1 and a condenser C 1 , and an FM demodulation stage 40 connected to an output terminal of the trap circuit and outputting a baseband signal, do.
상기와 같이 이루어진 본 고안의 작용및 효과를 설명하면 다음과 같다.Referring to the operation and effects of the present invention made as described above are as follows.
안테나에 수신된 고주파신호는 고주파증폭기에서 증폭되고 상기 증폭된 고주파신호는 쏘필터회로에서 중간주파수로 변환되고 상기 변환된 중간주파수는 중간주파수 증폭기에서 증폭되어 출력된다.The high frequency signal received by the antenna is amplified by a high frequency amplifier, the amplified high frequency signal is converted into an intermediate frequency in the saw filter circuit, and the converted intermediate frequency is amplified by an intermediate frequency amplifier and output.
상기 쏘필터회로의 출력은 중간주파수(480MHz)의 쏘필터회로의 특성상 발생되는 2차 고조파(960MHz)성분이 포함되어 있다.The output of the saw filter circuit includes a second harmonic (960 MHz) component generated due to the characteristics of the saw filter circuit of the intermediate frequency (480 MHz).
상기 2차 고조파성분은 트랩회로에서 트랩되어 결과적으로 트랩회로의 출력은 순수한 중간주파수(480MHz)가 된다.The second harmonic component is trapped in the trap circuit and as a result, the output of the trap circuit is at a pure intermediate frequency (480 MHz).
상기 트랩회로에서 출력되는 중간주파수는 FM 복조단에서 베이스밴드 신호로 복조되어 출력된다.The intermediate frequency output from the trap circuit is demodulated and output as a baseband signal by the FM demodulator.
상술한 바와같은 본 고안은 위성방송튜너에 사용되는 쏘필터회로의 자체특성상 발생하는 2차 고조파성분을 트랩회로로 제거함으로써 화면상에 나타나는 비트성분이 제거되어 양질의 화면을 감상할 수 있는 효과가 있다.As described above, the present invention removes the second harmonic component generated by the self-characteristic of the saw filter circuit used in the satellite broadcasting tuner with the trap circuit, thereby eliminating the bit components appearing on the screen, thereby providing a high quality screen. have.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019930025152U KR0137021Y1 (en) | 1993-11-26 | 1993-11-26 | Harmonic Rejection Circuit of Satellite Broadcast Tuner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019930025152U KR0137021Y1 (en) | 1993-11-26 | 1993-11-26 | Harmonic Rejection Circuit of Satellite Broadcast Tuner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR950015835U KR950015835U (en) | 1995-06-19 |
| KR0137021Y1 true KR0137021Y1 (en) | 1999-04-01 |
Family
ID=19368857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019930025152U KR0137021Y1 (en) | 1993-11-26 | 1993-11-26 | Harmonic Rejection Circuit of Satellite Broadcast Tuner |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR0137021Y1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100560000B1 (en) * | 2004-07-15 | 2006-03-13 | 세리플랫폼 주식회사 | circuits of tuner for satellite broadcasting |
-
1993
- 1993-11-26 KR KR2019930025152U patent/KR0137021Y1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100560000B1 (en) * | 2004-07-15 | 2006-03-13 | 세리플랫폼 주식회사 | circuits of tuner for satellite broadcasting |
Also Published As
| Publication number | Publication date |
|---|---|
| KR950015835U (en) | 1995-06-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0668656A1 (en) | A tuner for a satellite broadcasting receiver | |
| KR0137021Y1 (en) | Harmonic Rejection Circuit of Satellite Broadcast Tuner | |
| JPH0728235B2 (en) | Satellite receiver input circuit | |
| KR200197860Y1 (en) | Tuner for receiving television signal | |
| JP3343922B2 (en) | Satellite TV receiver input circuit | |
| KR100395087B1 (en) | One-cable low noise blockdown converter with improved function of separation between horizontal and vertical polarization isolation | |
| KR970007041Y1 (en) | Tuner | |
| US6094235A (en) | Digital television broadcast receiver that demodulates an intermediate frequency signal having a frequency higher than a frequency of a received signal | |
| KR0137033Y1 (en) | Digital Satellite Tuner | |
| KR100560000B1 (en) | circuits of tuner for satellite broadcasting | |
| KR100380723B1 (en) | Digital satellite receiver with capability of improving receiving sensitivity in low field area | |
| KR970004004Y1 (en) | Television receiver with built-in satellite broadcasting receiver | |
| KR960008159Y1 (en) | Band width switching circuit for receiving tuner | |
| KR100856327B1 (en) | Double conversion type television tuner | |
| JP3308648B2 (en) | Broadband DBS tuner | |
| JPH0450665Y2 (en) | ||
| JP2776063B2 (en) | Satellite receiver | |
| JPS6211539B2 (en) | ||
| KR100276258B1 (en) | Digital satellite broadcasting tuner | |
| KR20000012522U (en) | TV tuners for satellite broadcasting | |
| KR0133242Y1 (en) | Satellite broadcast tuner complementing strong-electric field | |
| KR940003925Y1 (en) | Double-band receiver | |
| KR970004910Y1 (en) | Suppression circuit of high frequency module for interference of intermediate frequency range | |
| JPH05260482A (en) | Satellite broadcast receiver | |
| KR920020841A (en) | Terrestrial and satellite broadcast receiver tuner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E701 | Decision to grant or registration of patent right | ||
| REGI | Registration of establishment | ||
| LAPS | Lapse due to unpaid annual fee |