KR20070067941A - Digital tuner - Google Patents

Digital tuner Download PDF

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Publication number
KR20070067941A
KR20070067941A KR1020050129494A KR20050129494A KR20070067941A KR 20070067941 A KR20070067941 A KR 20070067941A KR 1020050129494 A KR1020050129494 A KR 1020050129494A KR 20050129494 A KR20050129494 A KR 20050129494A KR 20070067941 A KR20070067941 A KR 20070067941A
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South Korea
Prior art keywords
intermediate frequency
tuner
amplifier
signal
frequency signal
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KR1020050129494A
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Korean (ko)
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김형동
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엘지이노텍 주식회사
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Priority to KR1020050129494A priority Critical patent/KR20070067941A/en
Publication of KR20070067941A publication Critical patent/KR20070067941A/en

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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
    • H04N5/4446—IF amplifier circuits specially adapted for B&W TV
    • 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
    • H04N5/455—Demodulation-circuits
    • 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
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/294—Indexing scheme relating to amplifiers the amplifier being a low noise amplifier [LNA]

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)
  • Circuits Of Receivers In General (AREA)
  • Noise Elimination (AREA)

Abstract

A digital tuner is provided to improve the receiving sensitivity of the digital tuner and maintain the receiving sensitivity irrespective of a received signal strength difference. A digital tuner includes a high pass filter(21) for filtering an input high-frequency signal, a low noise amplifier(22) for reducing a noise figure, a band pass filter(23) for filtering the output signal of the low noise amplifier, an amplifier(24), an intermediate frequency tuner(26) for tuning the output signal of the amplifier into an intermediate frequency through a low pass filter(25), and a controller(27) for setting a reference frequency to the intermediate frequency tuner. The digital tuner further includes a surface acoustic wave filter(28) for filtering the intermediate frequency signal tuned by the intermediate frequency tuner, an intermediate frequency amplifier(29) for amplifying the intermediate frequency signal filtered by the surface acoustic wave filter, a switch(30) for receiving a control signal from the controller and switching the intermediate frequency signal, an attenuator(31) for attenuating the intermediate frequency signal output from the switch, and a surface acoustic wave filter(32) for filtering the attenuated intermediate frequency signal and outputting the filtered intermediate frequency signal to a digital demodulator(33).

Description

디지털 튜너{DIGITAL TUNER}Digital tuner {DIGITAL TUNER}

도 1은 종래 디지털 튜너 블럭도1 is a conventional digital tuner block diagram

도 2는 본 발명 디지털 튜너 블럭도2 is a block diagram of the present invention.

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

20; 안테나 21; 고역통과필터20; Antenna 21; High pass filter

22; 저잡음증폭기 23; 대역통과필터22; Low noise amplifier 23; Bandpass Filter

24; 증폭기 25; 저역통과필터 24; Amplifier 25; Low pass filter

26; 중간주파튜너 27; 컨트롤러 26; Intermediate frequency tuner 27; controller

28; 표면탄성파필터 29; 중간주파 증폭기 28; Surface acoustic wave filter 29; Intermediate frequency amplifier

30; 스위칭부 31; 감쇄기 30; A switching unit 31; Attenuator

32; 표면탄성파필터 33; 디지털 복조기32; Surface acoustic wave filter 33; Digital demodulator

본 발명은 디지털 튜너에 관한 것이다.The present invention relates to a digital tuner.

일반적으로 디지털 튜너는 디지털 방송되는 다수의 텔레비젼 채널 중에서 원하는 하나의 채널만을 선택하여 중간주파로 변환하고, 이 변환된 중간주파는 컨트 롤러에서 설정된 주파수를 기초로 수신주파수를 설정한 후 디지털 방송 수신에 알맞게 필터링하고 증폭하여 디지털 복조기로 출력하는 하나의 디지털 방송 주파수 만을 동조시키는 장치이다.In general, the digital tuner selects only one desired channel from among a plurality of TV channels that are digitally broadcast and converts it into an intermediate frequency. The converted intermediate frequency is set based on the frequency set by the controller and then received by the digital broadcast. It is a device that tunes only one digital broadcasting frequency that is properly filtered, amplified and output to a digital demodulator.

이와 같이 하나의 디지털 방송주파수만을 동조시키는 디지털 튜너는 도 1에 도시한 바와 같이, 안테나(1)로부터 수신되는 고주파 대역신호를 고역통과필터(2)를 통해서 VHF / UHF로 분리하고 이 분리된 주파수대역은 저잡음증폭기(3)를 통해서 잡음을 낮추어지게 된다.As described above, a digital tuner that tunes only one digital broadcasting frequency separates the high frequency band signal received from the antenna 1 into the VHF / UHF through the high pass filter 2, and the separated frequency. The band is lowered through the low noise amplifier 3.

상기 잡음이 낮추어진 주파수 대역은 대역통과필터(4)에 의하여 소정의 주파수 대역으로 필터링되고, 증폭기(5)로 증폭되며, 저역통과필터(6)를 통해서 중간주파수 대역으로 필터링되어 중간주파튜너(7)에 입력되게 된다. The frequency band in which the noise is lowered is filtered into a predetermined frequency band by the band pass filter 4, amplified by the amplifier 5, and filtered into the intermediate frequency band through the low pass filter 6 to produce an intermediate frequency tuner ( 7) will be entered.

상기 중간주파튜너(7)에서는 자체의 위상고정루프 신디사이저에 의한 발진주파수와 컨트롤러(8)로부터 입력되는 기준주파수를 기초로 한 중간주파수를 비교한 중간주파 발진주파수를 출력하여 표면탄성파필터(9)를 통해서 불필요한 주파수를 제거하고 중간주파 증폭기(10)로 증폭한 후 상기 증폭된 중간주파를 표면탄성파필터(11)를 통해서 디지털 방송수신시 최적의 특성으로 필터링하여 디지털 복조기(12)로 출력하게 된다.The intermediate frequency tuner 7 outputs an intermediate frequency oscillation frequency obtained by comparing an oscillation frequency by its phase-locked-loop synthesizer with an intermediate frequency based on a reference frequency input from the controller 8, thereby providing a surface acoustic wave filter 9 After removing unnecessary frequencies through the intermediate frequency amplifier 10, the amplified intermediate frequency is filtered through the surface acoustic wave filter 11 to an optimum characteristic when receiving digital broadcasting and output to the digital demodulator 12. .

이와 같이 구동하는 상기 중간주파 튜너는 해당 지역별 전계 강도 세기에 따라 그 신호 출력 특성이 다르게 나타나게 된다. 즉 약전계 지역에서는 해당 채널의 선곡이 어렵게 되거나 인접 채널의 강한 신호에 영향을 받게 되기 때문에 수신상태가 불안정해지게 되는 감도 저하가 발생 되고, 이와 반대로 강전계 지역에서는 해 당 채널의 고주파 신호가 포화현상이나 방해파 배제 능력이 떨어져 과부하가 발생 되는 문제점이 있다.The intermediate frequency tuner driven as described above has different signal output characteristics according to the electric field strength of each region. In other words, in the weak field region, the selection of the corresponding channel becomes difficult or affected by the strong signal of the adjacent channel, resulting in a deterioration in the sensitivity of reception. On the contrary, in the strong field region, the high frequency signal of the channel is saturated. There is a problem that the overload occurs due to the phenomenon or the ability to exclude interference waves.

그래서 디지털 튜너의 경우에는 무엇보다도 감도가 중요시되기 때문에 종래에는 상기 중간주파튜너에 중간주파증폭기를 접속하여 약전계에서 감도를 개선하여 왔으나, 반대로 강전계에서는 중간주파증폭기(10)로 인하여 오히려 과부하가 발생되어 감도를 개선할 수 없는 문제점을 가지게 되었다.Therefore, in the case of the digital tuner, sensitivity is important above all, so in the past, an intermediate frequency amplifier has been connected to the intermediate frequency tuner to improve the sensitivity in the weak electric field. However, in the strong electric field, an overload is rather caused by the intermediate frequency amplifier 10. There is a problem that can not be improved sensitivity.

본 발명의 목적은 디지털 튜너에 수신감도를 개선하고자 하는데 있다.An object of the present invention is to improve reception sensitivity in a digital tuner.

본 발명의 다른 목적은 디지털 튜너가 수신 전계강도 차이에 관계없이 항상 양호한 수신감도를 유지할 수 있도록 하는데 있다.Another object of the present invention is to enable the digital tuner to maintain a good reception sensitivity regardless of the difference in the received field strength.

상기의 목적을 실현하기 위하여 본 발명은 입력되는 고주파신호를 고역통과필터와; 잡음지수를 낮추는 저잡음증폭기와; 소정의 주파수 대역으로 필터링하는 대역통과필터와; 증폭기와; 저역통과필터를 통해서 중간주파 발진주파수로 동조하는 중간주파튜너와; 상기 중간주파튜너에 기준주파수를 설정하는 컨트롤러와; 상기 중간주파튜너에서 동조된 중간주파신호를 필터링하는 표면탄성파필터와; 상기 표면탄성파필터에서 필터링된 중간주파신호를 증폭하는 중간주파증폭기와; 상기 컨트롤러로부터 제어신호를 받아 스위칭하는 스위칭부와; 상기 스위칭부에서 출력된 중간주파신호를 감쇄하는 감쇄기와; 상기 감쇄기에서 감쇄된 중간주파신호를 필터링하여 디지털 복조기에 출력하는 표면탄성파 필터로 구비하여서 된 것이다.In order to achieve the above object, the present invention provides a high pass filter for inputting a high frequency signal; A low noise amplifier for lowering the noise figure; A band pass filter for filtering to a predetermined frequency band; An amplifier; An intermediate frequency tuner tuned to an intermediate oscillation frequency through a low pass filter; A controller for setting a reference frequency to the intermediate frequency tuner; A surface acoustic wave filter for filtering the intermediate frequency signal tuned by the intermediate frequency tuner; An intermediate frequency amplifier for amplifying the intermediate frequency signal filtered by the surface acoustic wave filter; A switching unit which receives a control signal from the controller and switches the control signal; An attenuator for attenuating the intermediate frequency signal output from the switching unit; It is provided as a surface acoustic wave filter for filtering the intermediate frequency signal attenuated by the attenuator and output to the digital demodulator.

이하 첨부되는 도면에 의거 본 발명을 상세히 설명하면 다음과 같다Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명 디지털 튜너 블럭도로서, 본 발명은 안테나(20), 고역통과필터(21), 저잡음증폭기(22), 대역통과필터(23), 증폭기(24), 저역통과필터(25), 중간주파튜너(26), 컨트롤러(27), 표면탄성파필터(28), 중간주파 증폭기(29), 스위칭부(30), 감쇄기(31), 표면탄성파필터(32), 디지털 복조기(33)로 구성된다.2 is a block diagram of the digital tuner of the present invention. The present invention relates to an antenna 20, a high pass filter 21, a low noise amplifier 22, a band pass filter 23, an amplifier 24, and a low pass filter 25. , Intermediate frequency tuner 26, controller 27, surface acoustic wave filter 28, intermediate frequency amplifier 29, switching unit 30, attenuator 31, surface acoustic wave filter 32, digital demodulator 33 It consists of.

상기 고역통과필터(21)는 스프리터(SPRITER) 회로로 구성되어 상기 안테나(20)로부터 수신된 고주파신호를 VHF/UHF 신호로 분리하여 출력하게 된다.The high pass filter 21 is composed of a splitter circuit to separate and output a high frequency signal received from the antenna 20 into a VHF / UHF signal.

상기 저잡음증폭기(22)는 고주파증폭기로 구성되어 상기 VHF/UHF 분리된 신호 대역에서 잡음지수를 낮추어 출력하게 된다.The low noise amplifier 22 is configured as a high frequency amplifier to lower the noise figure in the signal band separated VHF / UHF output.

상기 대역통과필터(23)는 잡음지수가 낮추어진 주파수 대역에서 원하는 방송주파수 대역으로 필터링 하게 된다.The band pass filter 23 filters the desired broadcast frequency band from the frequency band of which the noise figure is lowered.

상기 증폭기(24)는 원하는 방송 주파수 대역 신호를 증폭하게 된다.The amplifier 24 amplifies a desired broadcast frequency band signal.

상기 저역통과필터(25)는 증폭기(24)에서 증폭된 주파수 대역 신호 잡음을 제거하면서 일정 대역의 주파수를 필터링하게 된다.The low pass filter 25 filters the frequency of a predetermined band while removing the frequency band signal noise amplified by the amplifier 24.

상기 중간주파튜너(26)는 내부의 위상고정루프 신디사이저에서 설정되는 발진주파수와 후술할 컨트롤러(27)에서 설정된 기준주파수를 비교하여 정확한 중간주파 발진주파수로 동조하여 출력하게 된다.The intermediate frequency tuner 26 compares the oscillation frequency set by the internal phase locked loop synthesizer with the reference frequency set by the controller 27 to be described later, and outputs the tuned to the correct intermediate frequency oscillation frequency.

상기 컨트롤러(27)는 피드백되는 자동이득조절신호를 토대로 중간주파튜너(26)에 기준주파수를 설정함과 아울러 임의로 기설정된 최대값 여부로 스위칭부(30)를 제어하게 된다.The controller 27 sets the reference frequency to the intermediate frequency tuner 26 based on the feedback control signal, which is fed back, and controls the switching unit 30 to a predetermined maximum value.

상기 표면탄성파필터(28)는 중간주파튜너(26)에서 출력되는 중간주파 발진주파수에 불필요한 주파수를 제거하게 된다.The surface acoustic wave filter 28 removes unnecessary frequencies in the intermediate frequency oscillation frequency output from the intermediate frequency tuner 26.

상기 중간주파 증폭기(29)는 상기 표면탄성파필터(28)에서 출력되는 중간주파수를 증폭하게 된다.The intermediate frequency amplifier 29 amplifies the intermediate frequency output from the surface acoustic wave filter 28.

상기 스위칭부(30)는 상기 컨트롤러(27)로부터 제어신호를 받아 스위칭 동작하게 된다.The switching unit 30 receives a control signal from the controller 27 to perform a switching operation.

상기 감쇄기(31)는 상기 중간주파 증폭기(29)에서 증폭된 중간주파수를 감쇄하게 된다.The attenuator 31 attenuates the intermediate frequency amplified by the intermediate frequency amplifier 29.

상기 표면탄성파필터(32)는 중간주파증폭기(29)를 통해서 증폭되거나 상기 감쇄기(31)를 통해서 감쇄되는 중간주파수에 불필요한 주파수를 제거하게 된다.The surface acoustic wave filter 32 removes unnecessary frequencies at the intermediate frequencies amplified by the intermediate frequency amplifier 29 or attenuated by the attenuator 31.

상기 디지털 복조기(33)는 중간주파신호의 신호레벨을 검출 및 주파수 오차를 검출하여 자동이득조절 제어신호를 생성하여 상기 중간주파튜너(26)의 아날로그/디지털 컨버터 단자(A/D C0N)로 입력하게 된다.The digital demodulator 33 detects the signal level of the intermediate frequency signal, detects a frequency error, generates an automatic gain control signal, and inputs the analog / digital converter terminal A / D C0N of the intermediate frequency tuner 26. Done.

상기와 같이 구성되는 본 발명은 안테나(20)로부터 수신되는 고주파신호를 고역통과필터(21)의 스프리터를 통해서 VHF/UHF로 분리하여 저잡음증폭기(22)로 잡음지수를 낮추어 대역통과필터(23)에 출력하게 된다.According to the present invention configured as described above, the high frequency signal received from the antenna 20 is separated into VHF / UHF through the splitter of the high pass filter 21, and the noise figure is lowered by the low noise amplifier 22. Will print to

상기 대역통과필터(23)에서는 잡음이 낮추어진 주파수대역에서 소정의 주파수 대역만을 필터링하고 증폭기(24)를 통해서 증폭하여 저역통과필터(25)를 통해서 중간주파 대역으로 필터링한 후 중간주파튜너(26)에 출력하게 된다. The band pass filter 23 filters only a predetermined frequency band in the frequency band where the noise is lowered, amplifies through the amplifier 24, filters the intermediate frequency band through the low pass filter 25, and then the intermediate frequency tuner 26. Will print).

상기 중간주파튜너(26)에서는 내부의 위상고정루프 신디사이저에서 설정되는 발진주파수와 컨트롤러(27)에서 설정된 기준주파수를 비교하여 중간주파수를 선택한 후 표면탄성파 필터(28)에 출력하게 되고, 상기 표면탄성파필터(28)에서는 불필요한 주파수를 제거하여 중간주파증폭기(29)를 통해서 증폭한 후 스위칭부(30)로 출력하게 된다.The intermediate frequency tuner 26 selects an intermediate frequency by comparing the oscillation frequency set by an internal phase locked loop synthesizer with a reference frequency set by the controller 27, and outputs the intermediate frequency to the surface acoustic wave filter 28. The filter 28 removes unnecessary frequencies, amplifies the intermediate frequency amplifier 29 and outputs the result to the switching unit 30.

이때 상기 스위칭부(30)에서는 컨트롤러(27)로부터 출력되는 신호에 의하여 스위칭동작을 하게 되는데, 즉 상기 컨트롤러(27)에서는 상기 중간주파튜너(26)의 아날로그/디지털 컨버터 단자(A/D CON)로 입력되는 디지털 복조기(33)로부터 출력되는 자동이득조절신호(AGC)로 스위칭 동작을 하게 된다.In this case, the switching unit 30 performs a switching operation by a signal output from the controller 27. That is, in the controller 27, an analog / digital converter terminal (A / D CON) of the intermediate frequency tuner 26 is performed. The switching operation is performed by the automatic gain control signal AGC outputted from the digital demodulator 33 input to.

따라서 상기 컨트롤러(27)에서는 상기 중간주파튜너(26)의 아날로그/디지털 컨버터 단자(A/D CON)에 입력되는 자동이득조절신호(AGC)가 임의로 설정된 최대 값인가를 판단하여 상기 자동이득조절신호(AGC)가 최대값이 아닌 경우, 상기 컨트롤러(27)에서는 수신 전계 강도가 약전계 인 것으로 판단하여 스위칭부(30)를 스위칭시키지 않게 된다.Therefore, the controller 27 determines whether the automatic gain control signal AGC inputted to the analog / digital converter terminal A / D CON of the intermediate frequency tuner 26 is a maximum value set arbitrarily, and thus the automatic gain control signal. When AGC is not the maximum value, the controller 27 determines that the received electric field strength is a weak electric field and does not switch the switching unit 30.

그러므로 상기 중간주파증폭기(29)에서 증폭된 중간주파수신호를 표면탄성파 필터(33)를 통해서 디지털 방송수신시 최적의 특성으로 필터링하여 디지털 복조기(33)로 출력하게 된다.Therefore, the intermediate frequency signal amplified by the intermediate frequency amplifier 29 is filtered through the surface acoustic wave filter 33 to an optimum characteristic when receiving digital broadcasting, and output to the digital demodulator 33.

반면에 상기 중간주파튜너(26)의 아날로그/디지털 컨버터 단자(A/D CON)에 입력되는 자동이득조절신호(AGC)가 최대값 인 경우, 상기 컨트롤러(27)에서는 수신 전계강도가 강전계인 것으로 판단하여 상기 스위칭부(30)를 감쇄기(31)로 스위칭시키게 된다.On the other hand, when the automatic gain control signal AGC inputted to the analog / digital converter terminal A / D CON of the intermediate frequency tuner 26 is the maximum value, the controller 27 indicates that the received electric field strength is a strong electric field. By judging, the switching unit 30 is switched to the attenuator 31.

그러므로 상기 감쇄기(31)에서는 상기 중간주파증폭기(29)에서 증폭된 중간주파수신호를 상기 자동이득제어신호(AGC)에 따른 레벨로 수신감도를 감쇄시켜 개선한 후, 상기 표면탄성파 필터(33)를 통해서 디지털 복조기(33)로 출력하여 디지털 방송수신시 최적의 특성으로 출력하게 된다.Therefore, the attenuator 31 attenuates and improves the intermediate frequency signal amplified by the intermediate frequency amplifier 29 to a level corresponding to the automatic gain control signal AGC, and then the surface acoustic wave filter 33 Through the digital demodulator 33 is output to the optimum characteristics when receiving digital broadcast.

이상에서 설명한 바와 같이 본 발명은 디지털 튜너에 감쇄기와 스위칭부를 구비하여 수신 전계강도가 약전계인 경우 증간주파신호를 증폭하고, 상기 수신전계강도가 강전계인 경우 중간주파 튜너의 중간주파신호를 감쇄하여 출력을 조절하도록 함으로써, 수신 전계강도 차이에 관계없이 양호한 수신감도를 유지할 수 있는 효과를 제공하게 되는 것이다.As described above, the present invention includes an attenuator and a switching unit in the digital tuner and amplifies the intermediate frequency signal when the received electric field strength is a weak electric field, and attenuates the intermediate frequency signal of the intermediate frequency tuner when the received electric field strength is a strong electric field. By adjusting the, it is possible to provide an effect of maintaining a good reception sensitivity irrespective of the difference in the received field strength.

Claims (1)

입력되는 고주파신호를 고역통과필터와; 잡음지수를 낮추는 저잡음증폭기와; 소정의 주파수 대역으로 필터링하는 대역통과필터와; 증폭기와; 저역통과필터를 통해서 중간주파 발진주파수로 동조하는 중간주파튜너와; 상기 중간주파튜너에 기준주파수를 설정하는 컨트롤러와; 상기 중간주파튜너에서 동조된 중간주파신호를 필터링하는 표면탄성파필터와; 상기 표면탄성파필터에서 필터링된 중간주파신호를 증폭하는 중간주파증폭기와; 상기 컨트롤러의 제어신호에 의하여 스위칭하는 스위칭부와; 상기 스위칭부에서 출력된 중간주파신호를 감쇄하는 감쇄기와; 상기 감쇄기에서 감쇄된 중간주파신호를 필터링하여 디지털 복조기에 출력하는 표면탄성파 필터로 구비하여서 된 디지털 튜너.A high pass filter for inputting a high frequency signal; A low noise amplifier for lowering the noise figure; A band pass filter for filtering to a predetermined frequency band; An amplifier; An intermediate frequency tuner tuned to an intermediate oscillation frequency through a low pass filter; A controller for setting a reference frequency to the intermediate frequency tuner; A surface acoustic wave filter for filtering the intermediate frequency signal tuned by the intermediate frequency tuner; An intermediate frequency amplifier for amplifying the intermediate frequency signal filtered by the surface acoustic wave filter; A switching unit for switching by a control signal of the controller; An attenuator for attenuating the intermediate frequency signal output from the switching unit; And a surface acoustic wave filter for filtering the intermediate frequency signal attenuated by the attenuator and outputting the filtered to the digital demodulator.
KR1020050129494A 2005-12-26 2005-12-26 Digital tuner KR20070067941A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101350583B1 (en) * 2012-05-31 2014-01-13 삼성전기주식회사 Channel tuning appratus and mehod in a broadcast receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101350583B1 (en) * 2012-05-31 2014-01-13 삼성전기주식회사 Channel tuning appratus and mehod in a broadcast receiver

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