KR20060089813A - Receving device for radio frequency signal - Google Patents

Receving device for radio frequency signal Download PDF

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KR20060089813A
KR20060089813A KR1020050010577A KR20050010577A KR20060089813A KR 20060089813 A KR20060089813 A KR 20060089813A KR 1020050010577 A KR1020050010577 A KR 1020050010577A KR 20050010577 A KR20050010577 A KR 20050010577A KR 20060089813 A KR20060089813 A KR 20060089813A
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tuner
variable capacitance
capacitance diode
filter
tuning
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김현규
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엘지이노텍 주식회사
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    • C—CHEMISTRY; METALLURGY
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    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/123—Spraying molten metal
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/18—After-treatment

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  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
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Abstract

본 발명은 튜너의 튜닝 주파수를 트랙킹하는 가변대역의 밴드패스필터를 설치함으로써 튜너에서 튜닝되는 신호의 노이즈를 최소화하도록 하기 위한 것이다.The present invention is to minimize the noise of the signal tuned in the tuner by providing a band pass filter of a variable band for tracking the tuning frequency of the tuner.

상기 목적 달성을 위하여 본 발명은 주파수 선택단자에 결선된 가변용량 다이오드에 가해지는 튜닝전압에 의하여 튜닝 주파수가 결정되는 튜너 IC; 안테나로부터 수신된 신호중에 상기 튜너 IC에 소정의 대역폭을 갖는 신호만을 입력하기 위하여 상기 가변용량 다이오드에 가해지는 튜닝전압에 의하여 동일하게 가변되는 필터용 가변용량 다이오드, 상기 필터용 가변용량 다이오드에 직결되는 밴드패스 필터로 이루어진 트랙킹 필터를 포함하는 기술구성으로 이루어진다.In order to achieve the above object, the present invention provides a tuner IC having a tuning frequency determined by a tuning voltage applied to a variable capacitance diode connected to a frequency selection terminal; A filter variable capacitance diode that is equally variable by a tuning voltage applied to the variable capacitance diode to input only a signal having a predetermined bandwidth to the tuner IC among the signals received from the antenna, and is directly connected to the filter variable capacitance diode. It consists of a technical configuration including a tracking filter consisting of a band pass filter.

트랙킹, 가변용량 다이오드, 튜너Tracking, Variable Capacitance Diode, Tuner

Description

알에프신호 수신장치 {receving device for radio frequency signal}RF signal receiver {receving device for radio frequency signal}

도 1은 일반적인 RF 신호를 튜닝하기 위한 수신장치의 구조를 설명하기 위한 블록도이다.1 is a block diagram illustrating the structure of a receiving apparatus for tuning a general RF signal.

도 2는 본 발명의 일실시예를 설명하기 위한 회로도이다.2 is a circuit diagram for explaining an embodiment of the present invention.

본 발명은 알에프(Radio Frequency) 신호 수신장치에 관한 것이다.The present invention relates to a radio frequency (RF) signal receiving apparatus.

안테나를 통해 입력된 RF 신호는 HPF(High Pass Filter)를 통과해서 증폭되고, 증폭된 신호는 감쇄기를 통해 감쇄되고, 재 증폭되어 튜너 IC에 입력되어 해당 주파수 대역의 신호가 선택된다.The RF signal input through the antenna is amplified by passing through the High Pass Filter (HPF), the amplified signal is attenuated by the attenuator, re-amplified and input to the tuner IC to select a signal of the corresponding frequency band.

도 1은 일반적인 RF 신호를 튜닝하기 위한 수신장치의 구조를 설명하기 위한 블록도이다.1 is a block diagram illustrating the structure of a receiving apparatus for tuning a general RF signal.

안테나(ANT)에 수신되는 신호는 HPF(1)에 의하여 고대역의 주파수만 통과되게 되고, HPF(1)를 통과한 신호는 증폭기(2)에 의하여 증폭된 후, 감쇄기(3)에 의하여 감쇄된 후 재차 증폭기(4)에 의하여 증폭되어 튜너 IC(5)에 의하여 튜닝된다. 튜너 IC(5)의 주파수 입력단자에는 도 1에 도시된 바와 같이 가변용량 다이오드 (VC1), (VC2)가 결선되어져 있고, 가변용량 다이오드(VC1), (VC2)에 인가되는 튜닝전압에 의하여 결정되는 정전용량에 따라 특정 주파수를 튜닝한다.The signal received by the antenna ANT is passed only by the high frequency band by the HPF 1, and the signal passing through the HPF 1 is amplified by the amplifier 2 and then attenuated by the attenuator 3. And then amplified by the amplifier 4 and tuned by the tuner IC 5. As shown in FIG. 1, the variable input diodes VC1 and VC2 are connected to the frequency input terminal of the tuner IC 5, and are determined by the tuning voltages applied to the variable capacitance diodes VC1 and VC2. Tune the specific frequency according to the capacitance that is being made.

이와 같은 구성의 RF 수신장치에서는 안테나(ANT)에서 수신되는 RF 신호는 HPF 필터에 의하여 필터링 된 후 증폭기들을 통하여 증폭되기 때문에 원하는 주파수대의 신호 이외에 인접 주파수 대역의 신호도 동일하게 증폭되고, 이러한 신호가 튜너 IC에 입력되기 때문에 인접 주파수의 신호에 의한 간섭을 받게 되고, 특히 인접 신호의 레벨이 클 경우에 이러한 영향은 매우 크게 작용한다.In the RF receiver having such a configuration, since the RF signal received from the antenna ANT is filtered by the HPF filter and then amplified through the amplifiers, the signals in the adjacent frequency bands are also amplified in addition to the signals in the desired frequency band. Since it is input to the tuner IC, it is interfered by signals of adjacent frequencies, and this effect is very large when the level of the adjacent signals is large.

본 발명은 이러한 문제점을 해결하기 위하여 발명된 것으로, 본 발명의 목적은 튜너에서 튜닝되는 신호의 노이즈를 최소화하도록 하기 위한 것이다.The present invention has been invented to solve this problem, and an object of the present invention is to minimize the noise of the signal tuned in the tuner.

상기 목적 달성을 위한 본 발명의 특징은 안테나로부터 수신되는 RF 신호를 튜닝시키는 RF 수신장치에 있어서: 주파수 선택단자에 결선된 가변용량 다이오드에 가해지는 튜닝전압에 의하여 튜닝 주파수가 결정되는 튜너 IC; 상기 안테나로부터 수신된 신호중에 상기 튜너 IC에 소정의 대역폭을 갖는 신호만을 입력하기 위하여 상기 가변용량 다이오드에 가해지는 튜닝전압에 의하여 동일하게 가변되는 필터용 가변용량 다이오드, 상기 가변용량 다이오드에 직결되는 밴드패스 필터로 이루어진 트랙킹 필터를 포함하는 것이다.A feature of the present invention for achieving the above object is an RF receiver for tuning an RF signal received from an antenna, comprising: a tuner IC having a tuning frequency determined by a tuning voltage applied to a variable capacitance diode connected to a frequency selection terminal; A variable capacitance diode for a filter that is equally varied by a tuning voltage applied to the variable capacitance diode to input only a signal having a predetermined bandwidth to the tuner IC among the signals received from the antenna, and a band directly connected to the variable capacitance diode. It includes a tracking filter composed of a pass filter.

또한, 본 발명에서 상기 밴드패스 필터와 튜너 IC간에는 RF 신호중에 직류성분을 제거하기 위한 제 1 콘덴서가 더 연결되는 것이 바람직하다.In the present invention, it is preferable that a first capacitor is further connected between the bandpass filter and the tuner IC to remove the DC component in the RF signal.

또한, 본 발명에서 상기 밴드패스 필터는 상기 필터용 가변용량 다이오드와 상기 제 1 콘덴서간에 연결된 제 1 인덕터, 상기 제 1 콘덴서와 상기 제 1 인덕터의 접속점과 접지간에 직렬 연결되는 제 2 콘덴서, 제 2 인덕터로 이루어지는 것이 바람직하다.The bandpass filter may further include a first inductor connected between the variable capacitance diode for the filter and the first capacitor, a second capacitor connected in series between a connection point of the first capacitor and the first inductor, and a ground; It is preferably made of an inductor.

도 2는 본 발명의 일실시예를 설명하기 위한 회로도이다.2 is a circuit diagram for explaining an embodiment of the present invention.

안테나(ANT)로부터 수신되는 RF 신호는 HPF(Highband Pass Filter)(11)를 거쳐 1차 증폭기(12)에서 증폭되고, 증폭된 신호는 감쇄기(13)에서 감쇄되고, 2차 증폭기(14)에서 재차 증폭된 후에 특정 주파수 대역만 통과시키는 트랙킹 필터(20)를 통과한 후 콘덴서(C3)를 거쳐 튜너 IC(21)에 의하여 튜닝된다. 이때, 콘덴서(C3)는 직류성분을 제거하기 위하여 설치된다.The RF signal received from the antenna ANT is amplified by the primary amplifier 12 via HPF (Highband Pass Filter) 11, the amplified signal is attenuated by the attenuator 13, and by the secondary amplifier 14. After being amplified again, it passes through the tracking filter 20 which passes only a specific frequency band and then is tuned by the tuner IC 21 via the capacitor C3. At this time, the capacitor C3 is installed to remove the direct current component.

트랙킹 필터(20)는 2차 증폭기(14)의 출력단에 연결된 가변용량 다이오드(VC3)와 가변용량 다이오드의 캐소오드와 튜너 IC(21)간에 연결되는 밴드 패스 필터(19)로 이루어지며, 밴드 패스 필터(19)는 가변용량 다이오드(VC3)와 콘덴서(C3)간에 연결된 인덕터(L1), 콘덴서(C3)와 인덕터(L1)의 접속점과 접지간에 직렬연결되는 콘덴서(C1), 인덕터(L2)로 이루어진다. 또한, 튜너 IC의 주파수 선택단자1과 튜닝전압 인가부 사이에는 저항(R1), 가변용량 다이오드(VC1)이 직렬연결되며, 튜너 IC의 주파수 선택단자2와 튜닝전압 인가부 사이에는 저항(R2)와 가변용량 다이오드(VC2)가 연결되며, 저항(R1), 가변용량 다이오드(VC1)의 접속점과 저항(R2)와 가변용량 다이오드(VC2)의 접속점간에는 콘덴서(C2)가 연결되며, 저항(R1), 가변용량 다이오드(VC1)의 접속점과 접지간에는 저항(R3)가 연결되며, 저항(R2)와 가변용 량 다이오드(VC2)의 접속점과 접지간에는 저항(R4)가 연결된다. 또한, 인덕터(L1), 콘덴서(C3)의 접속점에는 가변용량 다이오드(VC1), 가변용량 다이오드(VC2)에 인가되는 튜닝전압과 동일한 튜닝전압이 인가된다. 또한, 트랙킹 필터(20)의 튜닝전압이 인가되게 될 때에는 가변용량 다이오드(VC3), 콘덴서(C1)와 인덕터(L1), (L2)에 의하여 결정되는 필터의 중심주파수는 튜닝전압에 의하여 결정되는 튜너 IC의 공진주파수와 일치되도록 한다. 또한, 튜닝 전압에 의하여 가변되는 튜닝 주파수에 따라 트랙킹 필터(20)의 중심주파수도 가변되게 된다.The tracking filter 20 is composed of a variable capacitance diode VC3 connected to the output terminal of the secondary amplifier 14 and a band pass filter 19 connected between the cathode of the variable capacitance diode and the tuner IC 21, and a band pass. The filter 19 includes an inductor L1 connected between the variable capacitance diode VC3 and a capacitor C3, a capacitor C1 and an inductor L2 connected in series between the connection point of the capacitor C3 and the inductor L1 and the ground. Is done. In addition, a resistor R1 and a variable capacitor diode VC1 are connected in series between the frequency select terminal 1 of the tuner IC and the tuning voltage applying unit, and a resistor R2 between the frequency select terminal 2 of the tuner IC and the tuning voltage applying unit. And the variable capacitor diode VC2 are connected, and the capacitor C2 is connected between the connection point of the resistor R1, the variable capacitor diode VC1 and the connection point of the resistor R2 and the variable capacitor diode VC2, and the resistor R1. ), A resistor R3 is connected between the connection point of the variable capacitance diode VC1 and the ground, and a resistor R4 is connected between the connection point of the resistor R2 and the variable capacitance diode VC2 and the ground. Further, a tuning voltage equal to the tuning voltage applied to the variable capacitor diode VC1 and the variable capacitor diode VC2 is applied to the connection point of the inductor L1 and the capacitor C3. In addition, when the tuning voltage of the tracking filter 20 is applied, the center frequency of the filter determined by the variable capacitor diode VC3, the capacitor C1, the inductors L1, and L2 is determined by the tuning voltage. Match the resonant frequency of the tuner IC. In addition, the center frequency of the tracking filter 20 also varies according to the tuning frequency that is varied by the tuning voltage.

상기의 구성을 갖는 본 발명의 일실시예의 동작과정을 설명하기로 한다.An operation process of an embodiment of the present invention having the above configuration will be described.

안테나(ANT)로부터 수신되는 RF 신호는 HPF(11)에 의하여 필터링 된 후에 1차 증폭기(11)에 의하여 증폭된 후, 감쇄기(12)에 의하여 감쇄되고, 2차 증폭기(13)에 의하여 증폭된 후에 튜닝전압이 인가되는 트랙킹 필터(20)에 의하여 튜닝 주파수를 중심으로 한 한정된 대역의 신호를 튜너 IC(21)에 출력한다. 이와 같이, 튜너 IC(21)에 입력되는 신호는 튜닝 주파수를 중심으로한 소정의 대역폭을 갖는 신호로 주변의 신호가 차단된 상태로 입력된다.The RF signal received from the antenna ANT is amplified by the primary amplifier 11 after being filtered by the HPF 11 and then attenuated by the attenuator 12 and amplified by the secondary amplifier 13. Thereafter, the tracking filter 20 to which the tuning voltage is applied outputs a signal of a limited band centered on the tuning frequency to the tuner IC 21. In this way, the signal input to the tuner IC 21 is a signal having a predetermined bandwidth centered on the tuning frequency and is input with the surrounding signals blocked.

또한, 튜너 IC(21)에 연결된 주파수 선택용 가변용량 다이오드(VC1), (VC2)에 튜닝전압이 인가되어 튜닝 주파수가 결정되고, 이 튜닝전압은 트랙킹 필터(20)의 가변용량 다이오드(VC3)에 인가되기 때문에 트랙킹 필터의 중심 주파수는 튜너 IC(21)에 일치하게 된다.In addition, a tuning voltage is applied to the frequency selection variable capacitance diodes VC1 and VC2 connected to the tuner IC 21 to determine a tuning frequency, and the tuning voltage is the variable capacitance diode VC3 of the tracking filter 20. Since the center frequency of the tracking filter is applied to the tuner IC 21.

상기의 목적과 구성에 따른 본 발명에 의하면, 2차 증폭기와 튜너 IC 사이에 가변용량 다이오드와 밴드패스필터로 이루어진 트랙킹 필터를 설치하고, 가변용량 다이오드의 용량을 튜너 IC의 가변용량 다이오드와 동일한 튜닝 전압으로 가변시킴으로써 튜너 IC의 공진 주파수와 동일한 주파수를 중심주파수로 가변되게 한다. 이와 같은 결과 튜너 IC에는 항상 공진 주파수를 중심으로 한 소정의 대역폭을 갖는 신호만 입력되게 한다.According to the present invention according to the above object and configuration, a tracking filter composed of a variable capacitance diode and a band pass filter is provided between the secondary amplifier and the tuner IC, and the capacitance of the variable capacitance diode is tuned the same as that of the variable capacitance diode of the tuner IC. By varying the voltage, the frequency equal to the resonant frequency of the tuner IC is varied to the center frequency. As a result, only a signal having a predetermined bandwidth centered on the resonance frequency is input to the tuner IC.

상기와 같이, 튜너 IC에 튜닝 주파수를 중심으로 하는 소정의 대역폭을 갖는 신호가 입력되게 함으로써 튜닝 주파수에 관계없이 항상 인접 신호들로 인한 노이즈를 차단할 수 있다.As described above, the signal having a predetermined bandwidth centered on the tuning frequency is input to the tuner IC so that noise due to adjacent signals can always be blocked regardless of the tuning frequency.

Claims (3)

안테나로부터 수신되는 RF 신호를 튜닝시키는 RF 수신장치에 있어서:In an RF receiver for tuning an RF signal received from an antenna: 주파수 선택단자에 결선된 가변용량 다이오드에 가해지는 튜닝전압에 의하여 튜닝 주파수가 결정되는 튜너 IC;A tuner IC having a tuning frequency determined by a tuning voltage applied to a variable capacitance diode connected to a frequency selection terminal; 상기 안테나로부터 수신된 신호중에 상기 튜너 IC에 소정의 대역폭을 갖는 신호만을 입력하기 위하여 상기 가변용량 다이오드에 가해지는 튜닝전압에 의하여 동일하게 가변되는 필터용 가변용량 다이오드, 상기 가변용량 다이오드에 직결되는 밴드패스 필터로 이루어진 트랙킹 필터를 포함하는 것을 특징으로 하는 RF 수신장치.A variable capacitance diode for a filter that is equally varied by a tuning voltage applied to the variable capacitance diode to input only a signal having a predetermined bandwidth to the tuner IC among the signals received from the antenna, and a band directly connected to the variable capacitance diode. RF receiving device comprising a tracking filter consisting of a pass filter. 제 1 항에 있어서, 상기 밴드패스 필터와 튜너 IC간에는 RF 신호중에 직류성분을 제거하기 위한 제 1 콘덴서가 더 연결되는 것을 특징으로 하는 RF 수신장치. The RF receiver of claim 1, wherein a first capacitor is further connected between the bandpass filter and the tuner IC to remove a DC component from the RF signal. 제 2 항에 있어서, 상기 밴드패스 필터는 상기 필터용 가변용량 다이오드와 상기 제 1 콘덴서간에 연결된 제 1 인덕터, 상기 제 1 콘덴서와 상기 제 1 인덕터의 접속점과 접지간에 직렬 연결되는 제 2 콘덴서, 제 2 인덕터로 이루어지는 것을 특징으로 하는 RF 수신장치.The filter of claim 2, wherein the band pass filter comprises: a first inductor connected between the variable capacitance diode for the filter and the first capacitor; a second capacitor connected in series between a connection point of the first capacitor and the first inductor and a ground; An RF receiver comprising two inductors.
KR1020050010577A 2005-02-04 2005-02-04 Receving device for radio frequency signal KR20060089813A (en)

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