KR19990023263U - Digital tuner improves low symbol reception - Google Patents
Digital tuner improves low symbol reception Download PDFInfo
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- KR19990023263U KR19990023263U KR2019970035621U KR19970035621U KR19990023263U KR 19990023263 U KR19990023263 U KR 19990023263U KR 2019970035621 U KR2019970035621 U KR 2019970035621U KR 19970035621 U KR19970035621 U KR 19970035621U KR 19990023263 U KR19990023263 U KR 19990023263U
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Abstract
본 고안은 중간주파신호에 혼입된 인접채널신호를 제거하기 위한 필터부의 대역폭을 심볼레이트에 따라 가변시켜 심볼레이트가 낮은 로우심볼의 SCPC 채널신호에서도 높은 인접채널제거비를 얻을 수 있는 로우심볼의 수신효율을 개선한 디지탈 튜너에 관한 것으로, 본 고안에 의한 디지탈튜너는 중간주파신호의 입력단에 콘덴서를 통해 애노드단이 연결되고 캐소드단으로 저항을 통해 기준전압이 인가되는 제1스위칭다이오드와, 상기 중간주파신호의 입력단에 콘덴서를 통해 캐소드단이 연결되고 애노드단으로 저항을 통해 기준전압이 인가되는 제2스위칭다이오드와, 상기 제1스위칭다이오드의 캐소드에 콘덴서를 통해 제1입력단이 연결되고 제2스위칭다이오드의 애노드에 콘덴서를 제2입력단이 연결되고 와이드밴드의 통과특성과 협대역 통과특성을 갖는 듀얼밴드 쏘필터와, 상기 제1스위칭다이오드의 애노드와 제2스위칭다이오드이 캐소드에 저항을 통해 연결되어 하이레벨 및 로우레벨의 선택신호가 입력되는 선택신호입력단과, 상기 제1스위칭다이오드의 캐소드와 제2스위칭다이오드의 애노드를 각각 접지로 연결하는 다수의 저항으로 이루어진 바이패스회로를 구비한다.The present invention changes the bandwidth of the filter unit to remove the adjacent channel signal mixed in the intermediate frequency signal according to the symbol rate, so that the low symbol reception efficiency can be obtained even in the low symbol SCPC channel signal. The digital tuner according to the present invention includes a first switching diode in which an anode terminal is connected to an input terminal of an intermediate frequency signal through a capacitor and a reference voltage is applied through a resistor to a cathode terminal, and the intermediate frequency is adjusted. A second switching diode having a cathode connected to the input terminal of the signal and a reference voltage applied through a resistor to the anode, and a first input terminal connected to the cathode of the first switching diode through a capacitor and having a second switching diode The second input of the capacitor is connected to the anode of the wideband and narrowband passband characteristics. A dual band saw filter having a first switching diode, an anode of the first switching diode and a second switching diode connected to a cathode to receive a selection signal having a high level and a low level, and a cathode of the first switching diode; And a bypass circuit consisting of a plurality of resistors each connecting the anode of the second switching diode to ground.
Description
본 고안은 디지탈튜너에 관한 것으로, 보다 상세하게는 와이드밴드에 비하여 심볼레이트가 낮은 로우심볼의 SCPC(Single Cannel Per Carrier) 채널의 신호에서도 높은 인접채널제거비를 갖는 로우심볼의 수신효율을 개선한 디지탈 튜너에 관한 것이다.The present invention relates to a digital tuner. More specifically, the digital tuner improves the reception efficiency of a low symbol having a high adjacent channel rejection ratio even in a low symbol SCPC (Single Cannel Per Carrier) channel signal having a lower symbol rate than a wide band. It's about a tuner.
일반적인 디지탈튜너의 구성을 도1에 도시하였는데, 선국입력되는 고주파방송신호를 저잡음으로 증폭하는 전치증폭부(1)와, 상기 전치증폭부(1)로부터 출력된 고주파신호의 수신레벨이 일정하도록 이득조절하는 제1자동이득조절부(2)와, 상기 제1자동이득조절부(2)에서 이득조절된 고주파신호를 증폭하는 고주파증폭부(2)와, 상기 고주파증폭부(2)로부터 출력된 고주파신호의 잡음을 저지하는 로우패스필터부(4)와, 상기 로우패스필터부(4)를 통해 입력되는 고주파신호와 발진신호를 혼합하여 그 차신호인 중간주파신호를 출력하는 혼합부(5)와, 선국채널에 따라 설정된 중간주파신호를 얻을 수 있는 주파수로 발진하는 국부발진부(6)와, 상기 국부발진부(6)의 발진신호를 상기 혼합부(5)로 인가하는 버퍼증폭부(7)와, 상기 혼합부(5)로부터 출력되는 중간주파신호의 레벨이 균일하도록 이득제어하는 제2자동이득조절부(8)와, 상기 제2자동이득조절부(8)로부터 출력되는 중간주파신호를 증폭하는 제1중간주파증폭부(9)와, 통과대역이 고정되어 상기 중간주파신호에 혼입된 인접신호를 제거하는 중간주파필터부(10)와, 상기 중간주파필터부(10)를 통과한 중간주파신호를 출력레벨로 증폭하는 제2중간주파증폭부(11)와, 상기 제2중간주파증폭부(11)로부터 출력되는 중간주파신호를 I신호와 Q신호로 복조하는 I/Q복조부(12)를 구비한다.A general digital tuner is shown in FIG. 1, which has a preamplifier 1 for amplifying a high frequency broadcast signal inputted at low noise and a reception level of the high frequency signal output from the preamplifier 1 constant. A first automatic gain adjusting unit 2 for adjusting, a high frequency amplifier 2 for amplifying a high frequency signal gain-adjusted by the first automatic gain adjusting unit 2, and an output from the high frequency amplifier 2; A low pass filter unit 4 for preventing noise of a high frequency signal, and a mixing unit 5 for mixing a high frequency signal and an oscillation signal input through the low pass filter unit 4 and outputting an intermediate frequency signal which is the difference signal 5 ), A local oscillator 6 for oscillating at a frequency capable of obtaining an intermediate frequency signal set according to a channel, and a buffer amplifier 7 for applying an oscillation signal of the local oscillator 6 to the mixing unit 5. ) And the intermediate column output from the mixing section 5 A second automatic gain adjusting unit 8 for gain control so that the level of the signal is uniform, a first intermediate frequency amplifier 9 for amplifying the intermediate frequency signal output from the second automatic gain adjusting unit 8, A middle frequency filter unit 10 for eliminating adjacent signals mixed in the intermediate frequency signal with a fixed passband, and a second intermediate frequency for amplifying the intermediate frequency signal passed through the intermediate frequency filter unit 10 to an output level. An amplifying section 11 and an I / Q demodulating section 12 for demodulating the intermediate frequency signal output from the second intermediate frequency amplifier section 11 into an I signal and a Q signal.
이상 설명한 바와같은, 디지탈튜너에 있어서, 종래에는 혼합부로부터 출력되는 중간주파신호의 인접채널신호를 제거하는 중간주파필터부(10)를 와이드밴드의 쏘필터로 구성하고 있으며, 이 쏘필터의 통과대역폭은 수신되는 신호의 최대 심볼레이트의 약 1,28배로 설정되어 있다.As described above, in the digital tuner, in the related art, the intermediate frequency filter unit 10 which removes adjacent channel signals of the intermediate frequency signal output from the mixing unit is constituted by a wide band saw filter. The bandwidth is set at about 1,28 times the maximum symbol rate of the received signal.
그런데, ASTRA 위성의 경우에는 디지탈대역과 아날로그대역을 달리 설정하고 있으나, 유럽에서 사용되는 방송위성인 EUTEL 위성과 같은 경우에는 아날로그밴드 사이에 디지탈 밴드를 설정하고, 아날로그신호의 레벨을 디지탈신호보다 15∼20dB이상 크게 하고 있다.However, in the case of the ASTRA satellite, the digital band and the analog band are differently set, but in the case of the EUTEL satellite, which is a broadcasting satellite used in Europe, the digital band is set between the analog bands and the analog signal level is 15 to 15 It is increasing more than 20dB.
그렇기 때문에, 상기 EUTEL위성으로부터 송출된 SCPC(Single Channel Per Carrier) 디지탈채널의 신호를 상기 도시한 바와 같이 와이드밴드의 최대 심볼레이트의 1.28배의 대역폭으로 고정되어 있는 쏘필터를 구비한 종래의 디지탈튜너에서 수신하는 경우, 쏘필터의 통과대역에 인접채널인 아날로그신호성분이 포함된다. 따라서, 선국된 채널의 신호보다 15∼20보다 더 큰 이득의 인접채널신호의 간섭에 의하여 수신효율이 저하되는 문제점이 있었다.For this reason, a conventional digital tuner having a saw filter in which the signal of the SCPC (Single Channel Per Carrier) digital channel transmitted from the EUTEL satellite is fixed at a bandwidth of 1.28 times the maximum symbol rate of the wide band as shown above. When received at, the passband of the saw filter includes analog signal components that are adjacent channels. Therefore, there is a problem in that reception efficiency is lowered due to interference of adjacent channel signals having gains greater than 15 to 20 than those of tuned channels.
본 고안은 상술한 종래의 문제점을 해결하기 위하여 안출된 것으로, 그 목적은 중간주파신호에 혼입된 인접채널신호를 제거하기 위한 필터부의 대역폭을 심볼레이트에 따라 가변시켜 심볼레이트가 낮은 로우심볼의 SCPC 채널신호에서도 높은 인접채널제거비를 얻을 수 있는 로우심볼의 수신효율을 개선한 디지탈 튜너를 제공하는데 있는 것이다.The present invention has been devised to solve the above-described problems, and its purpose is to change the bandwidth of the filter unit for removing the adjacent channel signal mixed in the intermediate frequency signal according to the symbol rate, thereby making the low symbol rate SCPC. It is to provide a digital tuner that improves the reception efficiency of a low symbol that can obtain a high adjacent channel rejection ratio even in a channel signal.
상술한 본 고안의 목적을 달성하기 위한 구성수단으로써, 본 고안은 고주파증폭부와, 고주파신호를 중간주파신호로 변환하는 주파수변환부와, 중간주파신호에 혼입된 인접신호를 제거하는 중간주파필터부 및 중간주파증폭부로 이루어진 로우심볼의 수신효율을 개선한 디지탈 튜너에 있어서,As a construction means for achieving the above object of the present invention, the present invention is a high frequency amplifier, a frequency conversion unit for converting a high frequency signal into an intermediate frequency signal, and an intermediate frequency filter for removing adjacent signals mixed in the intermediate frequency signal In a digital tuner that improves the reception efficiency of a low symbol consisting of a negative and an intermediate frequency amplifier,
상기 중간주파필터부가The intermediate frequency filter unit
중간주파신호의 입력단에 콘덴서를 통해 애노드단이 연결되고 캐소드단으로 저항을 통해 기준전압이 인가되는 제1스위칭다이오드와,A first switching diode in which an anode terminal is connected to the input terminal of the intermediate frequency signal through a capacitor and a reference voltage is applied through a resistor to the cathode terminal;
상기 중간주파신호의 입력단에 콘덴서를 통해 캐소드단이 연결되고 애노드단으로 저항을 통해 기준전압이 인가되는 제2스위칭다이오드와,A second switching diode in which a cathode terminal is connected to an input terminal of the intermediate frequency signal through a capacitor and a reference voltage is applied through a resistor to an anode terminal;
상기 제1스위칭다이오드의 캐소드에 콘덴서를 통해 제1입력단이 연결되고 제2스위칭다이오드의 애노드에 콘덴서를 제2입력단이 연결되고 와이드밴드의 통과특성과 협대역 통과특성을 갖는 듀얼밴드 쏘필터와,A dual band saw filter having a first input terminal connected to a cathode of the first switching diode through a capacitor, a second input terminal connected to a capacitor of an anode of a second switching diode, and having a wide band pass characteristic and a narrow band pass characteristic;
상기 제1스위칭다이오드의 애노드와 제2스위칭다이오드이 캐소드에 저항을 통해 연결되어 하이레벨 및 로우레벨의 선택신호가 입력되는 선택신호입력단과,A selection signal input terminal to which an anode of the first switching diode and a second switching diode are connected to the cathode through a resistor to receive a selection signal of a high level and a low level;
상기 제1스위칭다이오드의 캐소드와 제2스위칭다이오드의 애노드를 각각 접지로 연결하는 다수의 저항으로 이루어진 바이패스회로를 구비한다.And a bypass circuit comprising a plurality of resistors connecting the cathode of the first switching diode and the anode of the second switching diode to ground, respectively.
도1은 일반적인 디지탈튜너를 도시한 블록구성도이다.1 is a block diagram showing a general digital tuner.
도2는 본 고안에 의하여 디지탈튜너에 구비되는 중간주파필터부를 도시한 회로도이다.2 is a circuit diagram showing an intermediate frequency filter unit provided in the digital tuner according to the present invention.
*도면의 주요부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *
21 : 듀얼밴드쏘필터21: Dual Band Saw Filter
R21∼R25 : 저항R21 to R25: resistance
C21∼C24 : 콘덴서C21 to C24: condenser
D21∼D22 : 스위칭다이오드D21 to D22: switching diode
S1 : 선택신호입력단S1: Selection signal input terminal
이하, 첨부한 도면을 참조하여 본 고안의 구성 및 작용을 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the present invention.
도1은 본 고안에 의한 디지탈 튜너에 구비될 중간주파필터부를 도시한 회로구성도로써, 중간주파입력단(IFin)이 콘덴서(C21)를 통해 제1스위칭다이오드(D21)의 애노드에 연결됨과 동시에 제2스위칭다이오드(D22)의 캐소드에 연결되고, 상기제1스위칭다이오드(D21)의 애노드에 연결됨과 동시에 제2스위칭다이오드(D22)의 캐소드는 또한 저항(R21)을 통해 선택신호입력단(S1)에 연결되고, 상기 제1스위칭다이오드(D21)의 캐소드는 콘덴서(C22)를 통해 듀얼밴드폭을 갖는 쏘필터(21)의 한 입력단(I1)에 연결됨과 동시에 직렬연결된 두 저항(R22),(R25)를 통해 접지되고, 상기 제2스위칭다이오드(D22)의 애노드는 콘덴서(C22)를 통해 듀얼밴드폭을 갖는 쏘필터(21)의 타 입력단(I2)에 연결됨과 동시에, 상기 직렬연결되는 두 저항(R23,R25)에 의해 접지되며, 상기 세 저항(R22),(R23),(R25)의 공통접점으로 저항(R24)를 통해 전원(+5V)가 인가되도록 구성한다.FIG. 1 is a circuit diagram illustrating an intermediate frequency filter unit included in a digital tuner according to the present invention, wherein an intermediate frequency input terminal IFin is connected to an anode of a first switching diode D21 through a capacitor C21, The cathode of the second switching diode D22 is connected to the cathode of the second switching diode D22, the anode of the second switching diode D22 is also connected to the selection signal input terminal S1 through the resistor R21. Connected, and the cathode of the first switching diode D21 is connected to one input terminal I1 of the saw filter 21 having a dual bandwidth through a capacitor C22 and simultaneously connected in series with two resistors R22 and R25. The ground of the second switching diode D22 is connected to the other input terminal I2 of the saw filter 21 having the dual bandwidth through the capacitor C22, and the two resistors connected in series. Grounded by (R23, R25), the three resistors (R22), (R23), (R25) It is configured to be applied to the power supply (+ 5V) to the common contact through the resistance (R24).
이하, 상술한 구성의 중간주파필터부의 동작을 설명한다.The operation of the intermediate frequency filter unit having the above-described configuration will be described below.
먼저, 도2에서 선택신호입력단(S1)으로는 수신신호의 심볼레이트에 따라서 하이레벨 또는 로우레벨의 두가지 선택신호가 입력된다.First, in FIG. 2, two selection signals of high level or low level are input to the selection signal input terminal S1 according to the symbol rate of the reception signal.
즉, SCPC 채널과 같은 로우 심볼 레이트의 채널을 수신하는 경우에는 로우레벨의 선택신호가 입력되고, MCPC(Multi Cannel Per Carrier)채널과 같이 높은 심볼 레이트의 채널을 수신하는 경우에는 하이레벨의 선택신호가 입력된다.That is, a low level selection signal is input when receiving a low symbol rate channel such as an SCPC channel, and a high level selection signal when receiving a high symbol rate channel such as a multi-cannel per carrier (MCPC) channel. Is input.
여기에서, 선택신호입력단(S1)으로 하이레벨선택신호가 인가되는 경우에는 애노드전압이 캐소드전압보다 높아진 제1스위칭다이오드(D21)가 도통하고, 애노드전압이 캐소드전압보다 낮아진 제2스위칭다이오드(D22)는 차단한다. 이에 도1에 도시한 제1중간주파증폭부(9)로부터 중간주파필터부로 입력되는 중간주파입력신호(IFin)는 콘덴서(C21)와 도통된 제1스위칭다이오드(D21)를 통해 듀얼밴드를 갖는 쏘필터(21)의 일 입력단으로 인가되고, 상기 선택신호입력단(S1)으로 입력된 DC신호는 도통된 제1스위칭다이오드(D21)와 저항(R22),(R25)를 통해 바이패스되고, 콘덴서(C22)에 의하여 쏘필터(21)로의 입력이 차단되어 쏘필터(21)에는 아무 영향을 주지 않는다.When the high level selection signal is applied to the selection signal input terminal S1, the first switching diode D21 having the anode voltage higher than the cathode voltage is turned on, and the second switching diode D22 having the anode voltage lower than the cathode voltage D22. ) Block. Accordingly, the intermediate frequency input signal IFin input from the first intermediate frequency amplifier 9 shown in FIG. 1 to the intermediate frequency filter unit has dual bands through the first switching diode D21 connected to the capacitor C21. The DC signal applied to one input terminal of the saw filter 21 and input to the selection signal input terminal S1 is bypassed through the first switching diode D21 and resistors R22 and R25 that are conducted. Input to the saw filter 21 is cut off by C22, which does not affect the saw filter 21 at all.
이에, 쏘필터(21)는 와이드밴드의 통과대역을 갖는 필터로 작용하여, 입력단(I1)으로 입력되는 MCPC채널과 같은 심볼레이트가 높은 채널의 중간주파신호를 필터링한다. 이때 쏘필터(21)의 통과대역폭은 예를들어, MCPC채널의 최대 심볼레이트의 1,28배이다.Thus, the saw filter 21 acts as a filter having a passband of a wide band, and filters the intermediate frequency signal of a channel having a high symbol rate, such as an MCPC channel input to the input terminal I1. At this time, the pass bandwidth of the saw filter 21 is, for example, 1,28 times the maximum symbol rate of the MCPC channel.
반대로, 선택신호입력단(S1)으로 로우레벨선택신호가 인가되는 경우에 제1스위칭다이오드(D21)는 애노드전압이 캐소드전압보다 낮아져 차단상태가 되고, 제2스위칭다이오드(D22)가 애노드전압이 캐소드전압보다 높아져 도통상태가 된다.On the contrary, when the low level selection signal is applied to the selection signal input terminal S1, the first switching diode D21 is cut off because the anode voltage is lower than the cathode voltage, and the anode voltage of the second switching diode D22 is cathode. It becomes higher than the voltage and becomes a conductive state.
따라서, 중간주파입력신호(IFin)는 콘덴서(C21)와 도통된 제2스위칭다이오드(D22)와 콘덴서(C23)을 통해서 듀얼밴드 쏘필터(21)의 타입력단(I2)로 인가된다. 그리고, 상기 선택신호입력단(S1)으로 입력된 로우레벨의 직류전류는 도통된 제2스위칭다이오드(D22)와 두 저항(R23),(R25)를 통해 바이패스되고, 콘덴서(C23)에 의해 쏘필터(21)로의 입력이 차단되어, 쏘필터(21)의 작용에 아무런 영향을 미치지 않는다.Accordingly, the intermediate frequency input signal IFin is applied to the type force stage I2 of the dual band saw filter 21 through the second switching diode D22 and the capacitor C23 which are connected to the capacitor C21. The low-level DC current input to the selection signal input terminal S1 is bypassed through the conductive second switching diode D22 and the two resistors R23 and R25, and is shot by the capacitor C23. The input to the filter 21 is cut off, which does not affect the operation of the saw filter 21.
이때, 상기 쏘필터(21)는 통과대역폭이 협대역(narrow band)으로 가변되어 제2입력단(I2)로 입력된 SCPC채널과 같은 로우 심볼 레이트의 채널의 중간주파신호를 필터링한다. 이때, 상기 쏘필터(21)의 통과대역폭은 예를들어, SCPC채널의 심볼레이트의 1.28배로 된다.In this case, the saw filter 21 filters the intermediate frequency signal of a channel having a low symbol rate such as the SCPC channel inputted to the second input terminal I2 by varying the passband into a narrow band. At this time, the pass bandwidth of the saw filter 21 is, for example, 1.28 times the symbol rate of the SCPC channel.
도1의 혼합기(15)로부터 출력되는 중간주파신호는 상술한 바와같이 그 심볼레이트에 따라 듀얼밴드 쏘필터(21)의 각각 다른 입력단자로 인가되며, 로우심볼의 채널신호는 특히 통과대역폭을 좁혀, 인접한 채널신호의 제거비를 높혔다.The intermediate frequency signal output from the mixer 15 of FIG. 1 is applied to different input terminals of the dual band saw filter 21 according to the symbol rate as described above, and the channel signal of the low symbol narrows the passband in particular. In addition, the removal ratio of adjacent channel signals is increased.
이와같이, 본 고안에 의한 디지탈튜너는 듀얼밴드의 쏘필터를 이용하여 SCPC채널과 같은 로우심볼레이트의 채널신호 입력시 협대역밴드로 통과시킴으로써, 인접채널제거비를 높혀 유럽의 EUTEL 위성과 같이 아날로그채널과 디지탈채널신호가 인접하고 있고, 아날로그채널신호가 디지탈채널신호보다 이득이 높은 경우의 로우심볼 채널신호를 수신하더라도 인접채널에 의한 간섭을 제거하여 수신효율을 높이는 효과가 있다.As described above, the digital tuner according to the present invention uses a dual band saw filter to pass a narrow band when inputting a low-symbolrate channel signal such as the SCPC channel, thereby increasing the adjacent channel rejection ratio and increasing the ratio of the adjacent channel to the analog channel like the European EUTEL satellite. Even when the digital channel signal is adjacent and the analog channel signal has a higher gain than the digital channel signal, even if the low symbol channel signal is received, the reception efficiency is improved by eliminating interference by the adjacent channel.
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| KR2019970035621U KR200310808Y1 (en) | 1997-12-04 | 1997-12-04 | Digital tuner improves low symbol reception |
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| KR2019970035621U KR200310808Y1 (en) | 1997-12-04 | 1997-12-04 | Digital tuner improves low symbol reception |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100395091B1 (en) * | 2001-07-06 | 2003-08-21 | 삼성전기주식회사 | Method for locking fec using symbolrate margin expansion |
| WO2007021127A1 (en) * | 2005-08-18 | 2007-02-22 | Lg Innotek Co., Ltd | Apparatus for receiving satellite broadcasting and method thereof |
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1997
- 1997-12-04 KR KR2019970035621U patent/KR200310808Y1/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100395091B1 (en) * | 2001-07-06 | 2003-08-21 | 삼성전기주식회사 | Method for locking fec using symbolrate margin expansion |
| WO2007021127A1 (en) * | 2005-08-18 | 2007-02-22 | Lg Innotek Co., Ltd | Apparatus for receiving satellite broadcasting and method thereof |
| US7865135B2 (en) | 2005-08-18 | 2011-01-04 | Lg Innotek Co., Ltd. | Apparatus for receiving satellite broadcasting and method thereof |
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