KR0125422Y1 - Up/down conversion tv tuner for improving noise index character - Google Patents
Up/down conversion tv tuner for improving noise index characterInfo
- Publication number
- KR0125422Y1 KR0125422Y1 KR2019920002563U KR920002563U KR0125422Y1 KR 0125422 Y1 KR0125422 Y1 KR 0125422Y1 KR 2019920002563 U KR2019920002563 U KR 2019920002563U KR 920002563 U KR920002563 U KR 920002563U KR 0125422 Y1 KR0125422 Y1 KR 0125422Y1
- Authority
- KR
- South Korea
- Prior art keywords
- signal
- tuner
- down conversion
- amplifier
- mixer
- Prior art date
Links
Classifications
-
- 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
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Superheterodyne Receivers (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
잡음지수 및 이득 특성향상을 위한 업-다운 컨버젼 TV 튜너의 업컨버젼부(30)는 안테나의 RF 입력신호가 초단에 마련된 핀 감쇄 AGC(36)와 RF 앰프(37)와 로우 패스필터(31)를 차례로 거쳐 1차 믹서(32)에서 전압가변 발진신호로믹싱되어 1차 IF 신호를 출력하게 구성하고, 다운컨버젼부(20)는 상기 업컨버젼부(30)의 1차 IF신호가 밴드 패스필터(21, 23)와 IF 앰프(22)를 거쳐 2차 믹서(24)에서 국부발진신호로 믹싱되어 2차 IF및 RF 신호를 출력하게 구성한다.The up-down conversion unit 30 of the up-down conversion TV tuner for improving the noise figure and gain characteristics includes a pin attenuation AGC 36, an RF amplifier 37, and a low pass filter 31 in which an RF input signal of an antenna is provided at the first stage. The first mixer 32 is configured to be mixed with the voltage variable oscillation signal to sequentially output the first IF signal, and the downconversion unit 20 is configured to convert the first IF signal of the upconversion unit 30 into a band pass filter. The secondary mixer 24 is mixed with the local oscillation signal via the 21 and 23 and the IF amplifier 22 to output the secondary IF and RF signals.
Description
제1도는 종래의 업-다운 컨버젼 TV 튜너의 회로 구성도.1 is a circuit diagram of a conventional up-down conversion TV tuner.
제2도는 본 고안의 업-다운 컨버젼 TV 튜너의 회로 구성도.2 is a circuit diagram of an up-down conversion TV tuner of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
20 : 다운 컨버젼부 21, 23 : 밴드 패스 필터20: down conversion unit 21, 23: band pass filter
22, 26 : IF 앰프 24 : 2차 믹서22, 26: IF amplifier 24: Secondary mixer
25 : 국부발전기 30 : 업컨버젼부25: local generator 30: upconversion unit
31 : 로우패스필터 32 : 1차믹서31: Low pass filter 32: First mixer
33, 34 : 버퍼앰프 35 : 전압가변발진기33, 34: buffer amplifier 35: voltage variable oscillator
36 : AGC 앰프 37 : RF 앰프36: AGC amplifier 37: RF amplifier
본 고안은 에어방송 및 케이블 TV 방송 수신용 더블 컨버젼 튜너에 관한 것으로, 특히 잡음지수 특성 향상을 위한 업-다운 컨버젼 TV 튜너에 관한 것이다.The present invention relates to a double conversion tuner for receiving air and cable TV broadcasts, and more particularly, to an up-down conversion TV tuner for improving noise figure characteristics.
더블 컨버젼 튜너는 안테나를 통하여 수신된 에어 방송 또는 케이블 방송 RF 신호를 1GHz 대의 높은 주파수쪽으로 변환한 다음 다시 필요한 IF주파수 또는 3채널 RF 주파수를 만들기 위해 낮은 주파수 쪽으로 변환하게 된다.The double conversion tuner converts the air or cable broadcast RF signal received via the antenna to a higher frequency in the 1 GHz range and then to a lower frequency to produce the required IF or three channel RF frequencies.
이와같은 더블컨버젼 튜너의 회로블록도를 제1도에서 보이고 있다.The circuit block diagram of such a double conversion tuner is shown in FIG.
여기에서 참조되는 바와같이 RF 입력을 수신 RF 대역만을 통과시키기 위한 로우패스 필터(11)를 거쳐 1차 믹서(12)에서 2단 버퍼 앰프(13, 14)를 거친 전압 가변발전기(15)의 발진주파수에 의해 1GHz대의 높은 주파수로 변환된다.Oscillation of the voltage variable generator 15 through the second stage buffer amplifiers 13 and 14 in the primary mixer 12 via the low pass filter 11 for passing the RF input only the reception RF band as referred to herein. The frequency is converted into a high frequency of 1 GHz band.
이렇게 업컨버젼부(10)에서 높은 주파수로 변화된 에어 또는 케이블 방송신호는 다운컨버젼부(20)에서 필요한 IF 신호로 변환되거나 RF 신호(3채널 RF 신호)로 변환되는데, 먼저 업 컨버젼부(10)의 1차 믹서로 부터 출력되는 1차 IF신호는 밴드패스 필터(21)와 IF 증폭기(22)와 밴드패스필터(23)를 차례로 거치면서 불필요한 대역 신호가 제거된 다음 2차 믹서(24)로 입력된다.The air or cable broadcast signal changed to the high frequency in the upconversion unit 10 is converted into an IF signal required by the downconversion unit 20 or an RF signal (three channel RF signal). The primary IF signal output from the primary mixer is passed through the bandpass filter 21, the IF amplifier 22, and the bandpass filter 23 in order to remove unnecessary band signals, and then to the secondary mixer 24. Is entered.
상기 2차 믹서(24)에서는 국부 발진기(25)의 발진주파수에 의해 IF신호나 3채널용 RF 신호로 변환되어 출력된다.In the secondary mixer 24, the oscillation frequency of the local oscillator 25 is converted into an IF signal or a three-channel RF signal and output.
그러나 상기한 기존의 더블 컨버젼 튜너는 로우패스필터(11)와 1차 밋서(12)에 의한 업컨버젼 부(10)의 초단설계에서 많은 손실을 가져오게 되므로 전체 시스템 잡음지수가 떨어지게 되어 있다.However, the conventional double conversion tuner has a large loss in the ultra-short design of the up-conversion section 10 by the low pass filter 11 and the first-order center 12, so that the overall system noise figure is lowered.
즉, 시스템 잡음지수(N, F)=10 log10FThat is, the system noise figure (N, F) = 10 log 10 F
의 공식에 의해, 잡음지수는 초단 설계가 좌우함을 알 수 있다.By the formula, we can see that the noise figure depends on the ultra short design.
여기에서, F1: 초단 잡음지수Where F 1 : ultrashort noise figure
F2: 2단 잡음지수F 2 : Two-stage noise figure
G1: 초단이득G 1 : Ultra Short Gain
G2: 2단이득 이다.G 2 : Two stage gain.
본 고안은 더블 커버젼 튜너의 설계 변경을 통하여 시스템 잡음지수 특성을 현저히 개선할 수 있는 잡음지수 특성향상을 위한 업-다운 컨버젼 TV 튜너를 제한한다.The present invention constrains the up-down conversion TV tuner to improve the noise figure, which can significantly improve the system noise figure through the design change of the double conversion tuner.
이하, 첨부한 도면을 참고로 하여 본 고안을 설명하면 다음과 같다.Hereinafter, the present invention with reference to the accompanying drawings as follows.
제2도는 본 고안의 시스템화로 블록도로써, 업컨버젼부(30)는 안테나를 통하여 입력되는 RF 신호가 핀 감쇄회로로 구성되는 AGC(36)와 RF 앰프(37)와 RF 로우패스 필터(31)를 차례로 거쳐 1차 믹서(32)로 입력되게 연결하고, 상기 1차믹서(32)에 입력되는 RF 신호는 2단 버퍼앰프(33,34)를 거친 전압가변 발진기(35)의 발진신호로 업컨버젼 되게 연결하여 구성한다.2 is a block diagram of the system of the present invention. The upconversion unit 30 includes an AGC 36, an RF amplifier 37, and an RF low pass filter 31, in which an RF signal input through an antenna is configured as a pin attenuation circuit. ) And the RF signal input to the primary mixer 32 as an oscillation signal of the voltage variable oscillator 35 passed through the second stage buffer amplifiers 33 and 34. Configure for upconversion.
상기 업컨버젼부(30)의 1차 IF신호는 다운컨버젼부(20)에서 2차IF신호로 변환출력되게 연결한다.The primary IF signal of the upconverter 30 is converted into a secondary IF signal by the downconverter 20.
상기 다운컨버젼부(20)는 1차 믹서(32)의 1차 IF 신호가 밴드패스필터(21), IF앰프(22), 밴드 패스필터(23)를 차례로 거쳐 2차믹서(24)로 입력되게 연결하고, 상기 2차 믹서(24)에 입력되는 1차 IF신호는 국부발진기(25)의 발진주파수에 의해 2차 IF또는 3채널 RF 신호로 변환된후 IF 앰프(26)를 더 거쳐 최종 IF 또는 RF 신호로 변환되어 출력되게 연결하여 구성한다.The down-conversion unit 20 inputs the primary IF signal of the primary mixer 32 to the secondary mixer 24 via the band pass filter 21, the IF amplifier 22, and the band pass filter 23. The primary IF signal input to the secondary mixer 24 is converted into a secondary IF or three-channel RF signal by the oscillation frequency of the local oscillator 25, and then further passed through the IF amplifier 26. It is configured by converting into IF or RF signal and outputting it.
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.
제 2 도에서, 안테나를 통하여 입력되는 RF신호는 업컨버젼부(30)의 초단AGC(36)에서 AGC 신호에 의해 핀 감쇄된다. 이때 AGC 리젝션은 50dB 이상으로 설계된다. 이에 따라 이득 차가 심한 방송신호는 일정한 수준으로 안정화된다.In FIG. 2, the RF signal input through the antenna is pin attenuated by the AGC signal at the first stage AGC 36 of the upconversion section 30. In FIG. AGC rejection is designed for more than 50dB. As a result, the broadcast signal with a large gain difference stabilizes to a certain level.
상기 AGC(36)에서 핀 감쇄된 RF신호는 RF 앰프(37)로 증폭된후 에어 및 케이블 밴드(50-810 MHz)의 로우패스 필터(31)를 거쳐 1차믹서단(32)에 제공된다.The pin attenuated RF signal in the AGC 36 is amplified by the RF amplifier 37 and provided to the primary mixer stage 32 via a low pass filter 31 of air and cable bands (50-810 MHz). .
여기에서 기존의 경우보다 3-4dB 개선된 잡음지수가 얻어진다.Here, the noise figure improved by 3-4dB is improved.
한편 로우패스 필터(31)를 안테나 초단에 설계하는 경우에는 전체 잡음지수가 1dB 정도 떨어짐을 알 수 있었다.On the other hand, when the low-pass filter 31 is designed at the very beginning of the antenna, it can be seen that the overall noise figure drops by about 1 dB.
이와같이 1차 믹서(32)에 입력된 RF신호는 전입가변발전기(35)의 960MHz발진주파수로 믹싱되어 이득 및 잡음지수가 향상된 1 GHz대의 1차 IF 신호로 출력된다.In this way, the RF signal input to the primary mixer 32 is mixed to the 960MHz oscillation frequency of the sequential variable generator 35 and output as a 1 GHz primary IF signal with improved gain and noise figure.
상기 업 컨버젼부(30)에서 높은 주파수 쪽으로 변환된 1 GHz대의 1차 IF신호는 다운컨버젼부(20)의 밴드패스필터(21, 23)와 IF 앰프(22)를 거쳐 2차 믹서(24)에서 국부발진기(25)의 발진주파수로 다운 컨버젼되어 2차 IF 또는 3채널용 RF로 출력된다.The 1 GHz primary IF signal converted from the up-conversion section 30 toward the higher frequency passes through the bandpass filters 21 and 23 and the IF amplifier 22 of the down-conversion section 20 to the secondary mixer 24. At down conversion to the oscillation frequency of the local oscillator 25 is output to the second IF or three-channel RF.
이상에서 설명한 바와같은 본 고안은 에어 및 케이블 방송용 더블 컨버젼 TV 튜너의 초단에 핀 감쇄 회로와 RF 앰프를 마련하는 것을 통하여 총 잡음지수 및 이득 향상을 도모할 수 있어 튜너의 이미지 리젝션, IF 주파수 응답특성 및 크로스 모듈레이션 특성의 향상효과를 얻을 수 있다.As described above, the present invention can improve the total noise figure and gain by providing a pin attenuation circuit and an RF amplifier at the first stage of a double conversion TV tuner for air and cable broadcasting, so that the image rejection and the IF frequency response of the tuner can be improved. The effect of improving the characteristics and cross modulation characteristics can be obtained.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR2019920002563U KR0125422Y1 (en) | 1992-02-21 | 1992-02-21 | Up/down conversion tv tuner for improving noise index character |
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KR2019920002563U KR0125422Y1 (en) | 1992-02-21 | 1992-02-21 | Up/down conversion tv tuner for improving noise index character |
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KR930020589U KR930020589U (en) | 1993-09-24 |
KR0125422Y1 true KR0125422Y1 (en) | 1998-10-15 |
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KR2019920002563U KR0125422Y1 (en) | 1992-02-21 | 1992-02-21 | Up/down conversion tv tuner for improving noise index character |
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