KR20090003013A - Input resonance circuit of tuner - Google Patents

Input resonance circuit of tuner Download PDF

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Publication number
KR20090003013A
KR20090003013A KR1020070067501A KR20070067501A KR20090003013A KR 20090003013 A KR20090003013 A KR 20090003013A KR 1020070067501 A KR1020070067501 A KR 1020070067501A KR 20070067501 A KR20070067501 A KR 20070067501A KR 20090003013 A KR20090003013 A KR 20090003013A
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KR
South Korea
Prior art keywords
band
vhf
input tuning
high frequency
frequency signal
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KR1020070067501A
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Korean (ko)
Inventor
김영근
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엘지이노텍 주식회사
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Priority to KR1020070067501A priority Critical patent/KR20090003013A/en
Priority to CN200880102472A priority patent/CN101779450A/en
Priority to PCT/KR2008/003616 priority patent/WO2009005241A1/en
Priority to TW097125283A priority patent/TW200908726A/en
Publication of KR20090003013A publication Critical patent/KR20090003013A/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
    • H04N5/50—Tuning indicators; Automatic tuning control
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof
    • H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
    • H04N21/4263—Internal components of the client ; Characteristics thereof for processing the incoming bitstream involving specific tuning arrangements, e.g. two tuners
    • 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

Abstract

An input resonance circuit of a tuner is provided to have a level attenuation unit in a VHF-H input resonance circuit to attenuate a signal level at a VHF-L band of a high frequency signal inputted when tuning a VHF-H band frequency. A first input resonance unit(21) inputs a high frequency signal to the first band. A second input resonance unit(22) inputs a high frequency signal to the second band. A third input resonance unit inputs a high frequency signal to the third band. A level attenuation unit(24) attenuates the level of a second band high frequency signal. The diode is conducted when selecting the second band.

Description

튜너의 입력동조회로{INPUT RESONANCE CIRCUIT OF TUNER}Input Tuning Circuit of Tuner {INPUT RESONANCE CIRCUIT OF TUNER}

도 1은 종래 튜너의 입력동조회로도1 is an input tuning circuit diagram of a conventional tuner.

도 2는 도 2의 입력동조회로의 VHF-H 대역 파형도2 is a VHF-H band waveform diagram of the input tuning circuit of FIG.

도 3은 본 발명의 일실시예에 따른 튜너의 입력동조회로도3 is an input tuning circuit diagram of a tuner according to an embodiment of the present invention.

도 4는 도 3의 입력동조회로의 VHF-H 대역 파형도4 is a VHF-H band waveform diagram of the input tuning circuit of FIG.

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

HPF; 고역통과필터 IF-TRAP; 중간주파트랩HPF; High pass filter IF-TRAP; Mid frequency trap

21; UHF 입력동조부 22; VHF-H 입력동조부21; UHF input tuning unit 22; VHF-H Input Tuning Unit

23; VHF-L 입력동조부 24; 레벨감쇄부23; VHF-L input tuning unit 24; Level reduction part

C; 콘덴서 L; 코일C; Capacitor L; coil

본 발명은 튜너의 입력동조회로에 관한 것이다.The present invention relates to an input tuning circuit of a tuner.

일반적으로 튜너는 안테나로부터 수신된 고주파신호로부터 원하는 방송채널을 선택하여 수신하는 장치로서, 상기 튜너는 방송채널 수가 증가함에 따라 수신 대역이 수 십MMz에서 수 백MMz에 이르는 브이 에치 에프(이하 VHF 라 칭함) 대역 과, 수 백MMz에서 수 십GMz에 이르는 유 에치 에프(이하 UHF 라 칭함) 대역까지 선택하여 수신할 수 있게 된다.In general, a tuner is a device that selects and receives a desired broadcast channel from a high frequency signal received from an antenna. The tuner is a VHF receiver having a reception band ranging from tens of MMz to several hundred MMz as the number of broadcast channels increases. And bands ranging from hundreds of MMz to tens of GMz (hereinafter referred to as UHF) bands.

또한 상기 튜너는 두 개의 대역 채널을 수신하는 VHF 튜너부와, UHF의 채널을 수신하는 UHF 튜너부로 분리되고, 상기 VHF 튜너부는 VHF-L과, VHF-H로 분리되게 된다.In addition, the tuner is divided into a VHF tuner unit for receiving two band channels, a UHF tuner unit for receiving a channel of the UHF, the VHF tuner unit is separated into a VHF-L and VHF-H.

상기와 같이 분리되는 튜너는 도 1에 도시한 바와 같이, 안테나(ANT)로부터 고역통과필터(HPF)와 중간주파트랩(IF-TRAP)을 통해서 중간주파수가 제거된 고주파신호를 동조하는 입력동조부를 구비하게 되는데, 상기 입력동조부는 중간주파트랩(IF-TRAP), 분압저항(R1)(R2), 다이오드(D1)를 통해서 470MHz ~ 850MHz의 UHF대역을 입력동조하는 UHF 입력동조부(11)와; 상기 중간주파트랩(IF-TRAP)와 코일(L2)(L3) 및 바렉터다이오드(D2)를 통해서 170MHz ~ 470MHz의 VHF대역을 입력동조하는 VHF-H 입력동조부(12)와; 상기 중간주파트랩(IF-TRAP), 코일(L4)(L5) 및 바렉터다이오드(D3)를 통해서 50MHz ~ 170MHz의 VHF대역을 입력동조하는 VHF-L 입력동조부(13)로 구성된다. As shown in FIG. 1, the tuner separated as described above has an input tuning unit for tuning a high frequency signal from which an intermediate frequency is removed from the antenna ANT through a high pass filter HPF and an intermediate frequency trap IF-TRAP. The input tuning unit and the UHF input tuning unit 11 for tuning the UHF band of 470MHz ~ 850MHz through the intermediate frequency trap (IF-TRAP), voltage divider (R1) (R2), diode (D1) ; A VHF-H input tuning unit 12 for tuning the VHF band of 170 MHz to 470 MHz through the intermediate frequency trap IF-TRAP, the coils L2, L3, and the selector diode D2; The intermediate frequency trap IF-TRAP, coils L4 and L5 and the selector diodes D3 are configured by a VHF-L input tuning unit 13 for tuning the VHF band of 50 MHz to 170 MHz.

이와 같이 구성된 종래 튜너의 입력동조회로는 UHF 선국시, 안테나(ANT)로부터 고역통과필터(HPF)를 통해서 수신된 고주파신호를 중간주파트랩(IF-TRAP)으로 중간주파신호를 제거한 후, 다이오드(D1)를 통해서 UHF 입력동조부(11)로 UHF 대역으로 동조하고, VHF 선국 시에는 중간주파트랩(IF-TRAP)으로 중간주파신호를 제거한 후, 코일(L2)(L3) 및 바렉터다이오드(D2)를 통해서 VHF-H 입력동조부(12)로 VHF-H 대역으로 동조함과 아울러, 코일(L4)(L5) 및 바렉터다이오드(D3)를 통해서 VHF-L 입력동조부(13)로 VHF-L 대역으로 각각 동조 한 후, 동조된 고주파신호를 증폭하게 된다. The input tuning circuit of the conventional tuner configured as described above removes the high frequency signal received from the antenna ANT through the high pass filter (HPF) from the antenna ANT with the intermediate frequency trap (IF-TRAP) and then the diode ( D1) is tuned to the UHF band by the UHF input tuning unit 11, and when the VHF is tuned, the intermediate frequency signal is removed by the IF-TRAP, and then the coils L2 (L3) and the varistor diode ( D2) to the VHF-H input tuning section 12 to the VHF-H band, and to the VHF-L input tuning section 13 through the coils L4 and L5 and the selector diode D3. After tuning to the VHF-L band, the amplified high frequency signal is amplified.

그러나 상기 튜너에서 VHF-H 대역을 선국하는 경우, 예를 들어 VHF-H 대역의 210.25MHZ 선국 시, 안테나(ANT)로부터 고역통과필터(HPF), 중간주파트랩(IF-TRAP)을 통해서 트랩된 고주파신호는 코일(L2)(L3), 다이오드(D22)를 통해서 VHF-H 입력동조부(12)에서 도 2의 A와 같은 신호로 동조 되어 상기 210.25MHZ를 선국하게 된다.However, when the tuner tunes the VHF-H band, for example, when 210.25MHZ is tuned in the VHF-H band, it is trapped through the high pass filter (HPF) and the intermediate frequency trap (IF-TRAP) from the antenna ANT. The high frequency signal is tuned to the signal as shown in A of FIG. 2 by the VHF-H input tuning unit 12 through the coils L2 and L3 and the diode D22 to tune the 210.25 MHz.

이와 같이 튜너에서 VHF-H 대역 주파수 선국시 선국되는 주파수는 도 2의 A와 같이 중간주파트랩(IF-TRAP)으로부터 입력되는 고주파신호가 상기 코일(L2)(L3)의 특성상 저역(50MHz ~ 170MHz)을 차단하지 못하게 되므로, 상기 선국되는210.25MHZ의 저역 부분이 -5dB만 감쇄되어 VHF-H 입력동조부(12)에 입력되게 된다.As such, the frequency tuned when the VHF-H band frequency is tuned in the tuner is low frequency (50 MHz to 170 MHz) due to the characteristics of the coils L2 and L3. ), The low end portion of the tuned 210.25MHZ is attenuated only by -5dB and is input to the VHF-H input tuning unit 12.

그러므로, 상기 VHF-H 입력동조부(12)에 입력되는 고주파신호는 VHF-H 고주파 동조하는 과정에서 상기 -5dB만 감쇄된 저역(50MHz ~ 170MHz)의 신호(55.25MHz + 157.25MHz = 212.5MHz)가 합쳐져 상기 선국 주파수 210.25MHZ에 간섭(비트)을 일으키게 되는 문제점이 있다.Therefore, the high frequency signal input to the VHF-H input tuning unit 12 is a low-frequency (50 MHz to 170 MHz) signal (55.25 MHz + 157.25 MHz = 212.5 MHz) in which only -5 dB is attenuated during VHF-H high frequency tuning. Add together to cause interference (bit) in the tuning frequency 210.25MHZ.

본 발명은 VHF-H의 신호 간섭을 방지한다.The present invention prevents signal interference of the VHF-H.

본 발명은 고주파신호를 제 1 대역으로 입력 동조하는 제 1 입력동조부와; 고주파신호로부터 제 2 대역을 입력동조하는 제 2 입력동조부와; 고주파신호로부터 제 3 대역을 입력동조하는 제 3 입력동조부와; 상기 제 2 대역 고주파신호의 레벨을 감쇄하는 레벨감쇄부를 포함한다.The present invention comprises: a first input tuning unit for input tuning a high frequency signal to a first band; A second input tuning unit for input tuning a second band from the high frequency signal; A third input tuning unit for input tuning the third band from the high frequency signal; And a level attenuator for attenuating the level of the second band high frequency signal.

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

도 3은 본 발명의 일실시예에 따른 튜너의 입력동조회로도이고, 도 4는 도 3의 입력동조회로의 VHF-H 대역 파형도이다.3 is an input tuning circuit diagram of a tuner according to an embodiment of the present invention, and FIG. 4 is a VHF-H band waveform diagram of the input tuning circuit of FIG.

고역통과필터(HPF)는 안테나(ANT)로부터 수신된 고주파신호(40 ~ 950MHz)에서 고역만을 필터링하여 출력하게 된다.The high pass filter HPF filters only the high pass from the high frequency signal 40 to 950 MHz received from the antenna ANT.

중간주파트랩(IF-TRAP)은 고역통과필터(HPF)에서 필터링 된 고주파신호에서 중간주파신호를 제거하게 되며, 상기 중간주파트랩(IF-TRAP)은 코일(L21)과 콘덴서(C22)를 병렬로 구성하게 된다.The intermediate frequency trap IF-TRAP removes the intermediate frequency signal from the high frequency signal filtered by the high pass filter HPF, and the intermediate frequency trap IF-TRAP parallels the coil L21 and the condenser C22. It consists of.

UHF 입력동조부(21)는 상기 중간주파트랩(IF-TRAP)에서 중간주파수가 제거된 고주파신호로부터 UHF 선택스위치(UHF-SW)신호에 의하여 스위칭다이오드(D21)를 턴온시켜 UHF 대역 주파수를 입력하여 동조하게 된다.The UHF input tuning unit 21 turns on the switching diode D21 by the UHF select switch (UHF-SW) signal from the high frequency signal from which the intermediate frequency is removed from the intermediate frequency trap (IF-TRAP) to input the UHF band frequency. Will be synchronized.

VHF-H 입력동조부(22)는 상기 중간주파트랩(IF-TRAP)에서 중간주파수가 제거된 고주파신호로부터 VHF-H 선택스위치(VHF-H SW)신호에 의하여 스위칭다이오드(D21)를 턴온시켜 레벨감쇄부(24), 코일(L22)(L23), 바렉터다이오드(D22)를 통해서 VHF-H 대역(170MHz ~ 470MHz)의 주파수를 입력하여 동조하게 된다.The VHF-H input tuning unit 22 turns on the switching diode D21 by the VHF-H selection switch (VHF-H SW) signal from the high frequency signal from which the intermediate frequency is removed from the intermediate frequency trap (IF-TRAP). The frequency of the VHF-H band (170 MHz to 470 MHz) is input and tuned through the level attenuation unit 24, the coils L22, L23, and the selector diode D22.

상기 레벨감쇄부(24)는 상기 중간주파트랩(IF-TRAP)으로부터 입력되는 VHF-H 대역에서 저역(50MHz ~ 170MHz)대역의 신호 레벨을 낮추기 위하여 소정의 범위의 고역만을 통과시키는 콘덴서(C),코일(L)을 포함하는 고역통과필터(HPF)로 구비하게 된다.The level attenuator 24 passes only a high range of a predetermined range in order to lower a signal level of a low range (50 MHz to 170 MHz) band in the VHF-H band input from the intermediate frequency trap (IF-TRAP). It is provided with a high pass filter (HPF) containing a coil (L).

VHF-L 입력동조부(23)는 상기 중간주파트랩(IF-TRAP)에서 중간주파수가 제거된 고주파신호로부터 코일(L24)(L25), 바렉터다이오드(D23)를 통해서 VHF-L 대역(50MHz ~ 170MHz)의 주파수를 입력하여 동조하게 된다.The VHF-L input tuning unit 23 transmits the VHF-L band (50 MHz) through the coil L24 (L25) and the selector diode D23 from the high frequency signal from which the intermediate frequency is removed from the intermediate frequency trap (IF-TRAP). ~ 170MHz) to enter and tune the frequency.

상기와 같이 구성되는 본 발명은 안테나(ANT)를 통해서 수신된 고주파신호를 고역통과필터(HPF)를 통해서 저역 주파수를 필터링한 후, 중간주파트랩(IF-TRAP)을 통해서 중간주파수만을 제거하여 UHF 입력동조부(21), VHF-H 입력동조부(22), VHF -L 입력동조부(23)로 각각 입력함으로써, 상기 UHF 입력동조부(21), VHF-H 입력동조부(22), VHF-L 입력동조부(23)에서는 각각 입력되는 고주파신호를 동조하면서 원하는 대역의 주파수를 선국하게 된다.According to the present invention configured as described above, the high frequency signal received through the antenna ANT is filtered through the high pass filter (HPF) and the low frequency, and then the intermediate frequency trap (IF-TRAP) to remove only the intermediate frequency UHF By inputting into the input tuning section 21, the VHF-H input tuning section 22, and the VHF-L input tuning section 23, respectively, the UHF input tuning section 21, the VHF-H input tuning section 22, The VHF-L input tuning section 23 tunes the frequency of the desired band while tuning the high frequency signals inputted respectively.

이때 상기 VHF-H의 대역 주파수를 선국하는 경우, VHF-H 스위치(VHF-H SW)에 의하여 공급되는 전압으로 다이오드(D)를 도통시키게 되어, 상기 고역통과필터(HPF)와 중간주파트랩(IF-TRAP)을 통해서 출력되는 고주파신호는 레벨감쇄부(24)의 콘덴서(C), 코일(L)에 의한 고역통과필터(HPF)로 소정의 VHF-H 대역 이하의 주파수는 차단하고, 소정의 VHF-H 대역 이상의 주파수만을 통과시켜 필터링하게 된다.At this time, when tuning the band frequency of the VHF-H, the diode D is conducted with the voltage supplied by the VHF-H switch (VHF-H SW), so that the high pass filter (HPF) and the intermediate frequency trap ( The high frequency signal output through the IF-TRAP) is a high pass filter (HPF) by the capacitor (C) and the coil (L) of the level attenuation unit 24, and cuts frequencies below a predetermined VHF-H band, Only the frequencies above the VHF-H band are filtered through.

그러므로 상기 VHF-H 대역 주파수 선국시 도 4의 B에 도시한 바와 같이, 상기 선국된 VHF-H 대역에서 상기 레벨감쇄부(24)에 의하여 VHF-L(50MHz ~ 170MHz)대역의 신호 레벨을 크게 낮추어 주게 되므로, 상기 VHF-H 대역 주파수 선국 시 상기 VHF-L(50MHz ~ 170MHz)대역에 의한 신호 간섭을 줄일 수 있게 되는 것이다.Therefore, when tuning the VHF-H band frequency, as shown in B of FIG. 4, the signal level of the VHF-L (50 MHz to 170 MHz) band is greatly increased by the level attenuation unit 24 in the tuned VHF-H band. Since it is lowered, it is possible to reduce the signal interference by the VHF-L (50MHz ~ 170MHz) band when tuning the VHF-H band frequency.

이상에서 설명한 바와 같이 본 발명은 튜너의 입력동조회로에서 VHF-H 입력동조회로에 레벨감쇄부를 구비하여 상기 VHF-H 대역 주파수 선국 시 입력되는 고주파신호의 VHF-L 대역에 신호 레벨을 감쇄하여 줌으로써, 상기 VHF-H 입력동조 과정에서 상기 VHF-L 대역의 신호 간섭을 차단하게 되므로, 상기 VHF-H 입력동조를 개선할 수 있게 되는 것이다.As described above, the present invention provides a level attenuator in the VHF-H input tuning circuit in the tuner's input tuning circuit, thereby attenuating the signal level in the VHF-L band of the high frequency signal input during the VHF-H band frequency tuning. In the VHF-H input tuning process, signal interference of the VHF-L band is blocked, thereby improving the VHF-H input tuning.

Claims (5)

고주파신호를 제 1 대역으로 입력 동조하는 제 1 입력동조부와; 고주파신호로부터 제 2 대역을 입력동조하는 제 2 입력동조부와; 고주파신호로부터 제 3 대역을 입력동조하는 제 3 입력동조부와; 상기 제 2 대역 고주파신호의 레벨을 감쇄하는 레벨감쇄부를 포함하는 튜너의 입력동조회로. A first input tuning unit for input tuning the high frequency signal to the first band; A second input tuning unit for input tuning a second band from the high frequency signal; A third input tuning unit for input tuning the third band from the high frequency signal; And a level attenuator for attenuating the level of said second band high frequency signal. 제 1 항에 있어서, The method of claim 1, 상기 레벨감쇄부는 제 2 대역 선국시 도통되는 다이오드와, 상기 중간주파트랩으로부터 수신되는 고주파신호의 저역을 차단하고 고역을 통과하는 고역통과필터를 포함하는 튜너의 입력동조회로.And the level attenuating unit comprises a diode which is turned on when tuning the second band, and a high pass filter for blocking a low range of a high frequency signal received from the intermediate frequency trap and passing a high range. 제 2 항에 있어서, The method of claim 2, 상기 고역통과필터는 콘덴서와, 상기 콘덴서와 병렬로 코일을 포함하는 튜너의 입력동조회로.And the high pass filter comprises a condenser and a coil in parallel with the condenser. 제 1 항 또는 제 2 항에 있어서,The method according to claim 1 or 2, 상기 레벨감쇄부는 상기 제 2 대역 입력동조회로 전단에 구비되는 것을 특징으로 하는 튜너의 입력동조회로.And said level attenuator is provided in front of said second band input tuning circuit. 제 1 항 내지 제 4 중 어느 하나의 항에 있어서, 상기 제 1 대역은 UHF 대역, 제 2 대역은 VHF-H 대역, 제 3 대역은 VHF-L 대역인 것을 특징으로 하는 튜너의 입력동조회로.The tuner's input tuning circuit according to any one of claims 1 to 4, wherein the first band is a UHF band, the second band is a VHF-H band, and the third band is a VHF-L band. .
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