KR960007134B1 - Lnb - Google Patents

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Publication number
KR960007134B1
KR960007134B1 KR1019930009063A KR930009063A KR960007134B1 KR 960007134 B1 KR960007134 B1 KR 960007134B1 KR 1019930009063 A KR1019930009063 A KR 1019930009063A KR 930009063 A KR930009063 A KR 930009063A KR 960007134 B1 KR960007134 B1 KR 960007134B1
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South Korea
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signal
low noise
amplifier
frequency
stub
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KR1019930009063A
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Korean (ko)
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KR940027340A (en
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변종대
임재봉
박주상
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나우정밀주식회사
이용규
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06Receivers
    • H04B1/10Means associated with receiver for limiting or suppressing noise or interference

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

The low noise receiver circuit comprises an antenna for receiving a radio signal; a low noise amplifying unit for eliminating noise from the received signal; a frequency converting unit for converting the frequency of the input signal from the low noise amplifying unit by applying an oscillation signal of an oscillator; a low band pass filter; and an intermediate frequency amplifier. The low noise amplifying unit includes an input matching circuit having a first stub for passing an input signal from a signal source, a transfer signal, and a first quarter wavelength ( g) open stub. Also, the low noise amplifying unit includes an output matching circuit having an amplifier for amplifying a signal from the input matching circuit, a second quarter wavelength ( g) open stub for passing a signal from the amplifier, and a second stub.

Description

영상신호를 제거할 수 있는 저잡음 수신기회로Low noise receiver circuit that can remove video signal

제 1 도는 종래의 수신기회로의 블럭도.1 is a block diagram of a conventional receiver circuit.

제 2 도는 본 발명에 따른 수신기회로의 블럭도.2 is a block diagram of a receiver circuit according to the present invention.

제 3 도는 본 발명에 따른 저잡음증폭기(LNN)의 회로도이다.3 is a circuit diagram of a low noise amplifier (LNN) according to the present invention.

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

1, 11 : 안테나(ANT) 2, 12 : 저잡음증폭기(LNA)1, 11 antenna (ANT) 2, 12 low noise amplifier (LNA)

3 : 대역통과필터(BPF) 4, 14 : 주파수변환부3: band pass filter (BPF) 4, 14: frequency converter

4, 14 : 주파수변환부 5, 15 : 저역통과필터(LPF)4, 14: frequency converter 5, 15: low pass filter (LPF)

6, 16 : 중간주파수증폭부(IFA) 7, 17 : 국부발진기(local OSC)6, 16: intermediate frequency amplifier (IFA) 7, 17: local osc

31, 37 : 스터브 32, 36 : 전송선로31, 37: stub 32, 36: transmission line

33, 35 : 개방스터브33, 35: open stub

[발명의 분야][Field of Invention]

본 발명은 저잡음 수신기회로에 관한 것으로, 특히 대역통과필터를 사용하지 않고서도 수신신호중에 포함된 영상신호(image signal)를 제거할 수 있는 저잡음 수신기회로에 관한 것이다.The present invention relates to a low noise receiver circuit, and more particularly, to a low noise receiver circuit capable of removing an image signal contained in a received signal without using a band pass filter.

[발명의 배경][Background of invention]

종래의 전형적인 수신기회로는, 제 1 도에 도시된 바와 같이, 전송된 무선 신호를 수신하는 안테나(1), 수신된 신호중에 포함된 잡음을 제거하기 위한 저잡음증폭기(2), 영상신호(Image signal)를 제거하기 위한 대역통과필터(3), 국부발진기(7)로부터 발생된 발진신호를 이용하여 저잡음증폭부(2)와 대역통과필터(3)를 통과한 수신신호를 주파수변환하기 위한 주파수변환부(4), 특정대역의 신호만을 통과시키기 위한 저역통과필터(5), 및 중간주파수증폭부(6)로 구성된다.Conventional typical receiver circuits include an antenna (1) for receiving a transmitted radio signal, a low noise amplifier (2) for removing noise contained in the received signal, and an image signal, as shown in FIG. Frequency conversion for frequency conversion of the received signal passing through the low noise amplifier 2 and the band pass filter 3 using the oscillation signal generated from the band pass filter 3 and the local oscillator 7 for removing Section 4, a low pass filter 5 for passing only signals of a specific band, and an intermediate frequency amplifier 6;

상기와 같은 구성을 가진 종래의 수신기회로에 있어서, 상기 안테나(1)를 통하여 수신된 무선주파수신호는 저잡음증폭부(2)를 통과하면서 저잡음신호를 증폭하는데, 이 때 증폭된 신호는 수신신호의 영상신호대역에서 증폭도를 갖게 되므로, 대역통과필터(3)를 이용하여 필터링하여야 수신신호내의 영상신호가 완전하게 제거된다.In the conventional receiver circuit having the above structure, the radio frequency signal received through the antenna 1 amplifies the low noise signal while passing through the low noise amplifier 2, wherein the amplified signal Since the amplification degree is obtained in the video signal band, the video signal in the received signal is completely removed by filtering using the band pass filter 3.

상기와 같이, 수신신호내의 영상신호를 제거하기 위하여, 종래에는 수신기회로에 대역통과필터(BPF)의 사용이 필수적이었다. 그러나, 대역통과필터(BPF)를 사용하면 대역통과필터에 의한 수신신호의 손실이 발생할 뿐만 아니라, PCB 기판상에 수신기회로를 구성하는데 있어서 대역통과필터가 넓은 면적을 차지하므로 수신기의 소형화에 지장을 초래하였다.As described above, in order to remove the video signal in the received signal, it is necessary to use a band pass filter (BPF) in the receiver circuit. However, the use of band pass filter (BPF) not only causes the loss of the received signal by the band pass filter, but also causes the receiver to be miniaturized because the band pass filter occupies a large area in constructing the receiver circuit on the PCB substrate. Caused.

또한 초고주파가 주로 사용되는 무선송수신에 있어서 대역통과필터를 구성할 때 사용되는 공진기와 공진기 사이의 간격(gab)이 협소해지므로 실제 PCB 기판상의 구현에 많은 어려움이 있었던 것이다.In addition, since the gap between the resonator and the resonator used when configuring the band pass filter becomes narrow in the wireless transmission and reception where the ultra high frequency is mainly used, there are many difficulties in the actual implementation on the PCB substrate.

[발명의 목적][Purpose of invention]

본 발명은 전술한 종래의 수신기회로가 지닌 문제점을 해결하기 위하여 안출된 것으로서, 본 발명의 목적은 대역통과필터를 사용하지 않고서도 수신신호에 포함된 영상신호를 효과적으로 제거할 수 있는 저잡음증폭기를 가진 수신기회로를 제공하는데 있다.SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the conventional receiver circuit described above, and an object of the present invention is to provide a low noise amplifier that can effectively remove a video signal included in a received signal without using a band pass filter. To provide a receiver circuit.

[발명의 요약][Summary of invention]

상기 목적을 달성하기 위한 본 발명의 저잡음 수신기회로는, 전송된 무선신호를 수신하기 위한 안테나, 상기 안테나에 수시된 신호중의 잡음을 제거하기 위한 저잡음 중폭부, 국부발진기로부터의 발진신호를 이용하여 저잡음 증폭부를 통과한 수신신호를 주파수변환하기 위한 주파수변환부, 저역통과필터 및 중간주파수(IF) 증폭부를 구비한 저잡음 수신기회로에 있어서, 상기 저잡음 증폭부가 수신신호주파수대역에서는 정합 특성을 가지며, 영상신호주파수대역에서는 대역저지특성을 가진 정합회로부를 구비하여, 별도의 대역 통과 필터없이도 영상신호를 제거할 수 있는 것을 특징으로 한다.The low-noise receiver circuit of the present invention for achieving the above object is an antenna for receiving a transmitted radio signal, a low noise medium width for removing noise in the signal received by the antenna, low noise using an oscillation signal from a local oscillator A low noise receiver circuit comprising a frequency converter, a low pass filter, and an intermediate frequency (IF) amplifier for frequency converting a received signal passing through the amplifier, wherein the low noise amplifier has matching characteristics in a reception signal frequency band, and an image signal. In the frequency band is provided with a matching circuit having a band stop characteristic, it is characterized in that the video signal can be removed without a separate band pass filter.

[발명의 구체적 실시예에 대한 설명][Description of Specific Embodiment of the Invention]

이하 첨부된 도명을 참고하여 본 발명을 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

제 2 도는 본 발명에 따른 저잡음 수신기회로의 블럭도로서, 안테나(11), 저잡음 증폭부(12), 주파수변환부(14), 저역통과필터(15), 및 중간주파수증폭부(16)의 순서로 직결되어 있으며, 국부발진기(17)는 주파수 변환부(14)의 한 입력단에 연결되어서 주파수변화부(14)에 발진신호를 공급하도록 구성되어 있다. 이것을 제1도와 비교하면 종래에 영샹주파수신호를 제거하기 위한 대역통과필터(3)가 제거된 것을 알 수 있을 것이다.2 is a block diagram of a low noise receiver circuit according to the present invention, wherein the antenna 11, the low noise amplifier 12, the frequency converter 14, the low pass filter 15, and the intermediate frequency amplifier 16 are shown in FIG. Directly connected in order, the local oscillator 17 is connected to one input terminal of the frequency converter 14 and is configured to supply an oscillation signal to the frequency change unit 14. Comparing this with FIG. 1, it can be seen that the bandpass filter 3 for removing the Young's frequency signal is conventionally removed.

먼저 안테나(11)로부터 전송된 무선신호를 수신한 저잡음증폭부(12)는 신호대역에서는 정합특성을 가지며, 영상신호대역에서는 대역저지특성을 갖도록 구성된 정합회로부에 의하여, 수신신호를 저잡음증폭하면서 동시에 수신신호에 포함된 영상신호를 제거하여 주파수변환부(14)로 출력하게 된다.First, the low noise amplifier 12 receiving the radio signal transmitted from the antenna 11 has a matching characteristic in the signal band, and a matching circuit unit configured to have a band stop characteristic in the video signal band, thereby simultaneously amplifying the received signal with low noise. The video signal included in the received signal is removed and output to the frequency converter 14.

상기와 같은 저잡음증폭부(12)의 구체예가 제 3 도에 도시되어 있다. 도시된 바와 같이, 신호원으로부터 입력되는 신호를 제 1 스터부(31), 전송선로(32), 및 제 1 개방스터브(32)로 구성된 입력정합회로를 통과시킨후에, 증폭부(34)에서 증폭시키는 과정을 거쳐서, 다시 제 2 개방스터브(35), 전송선호(36), 및 제 2 스터부(37)로 구성된 출력정합회로를 통과시키도록 구성되어 있다.An example of such a low noise amplifier 12 is shown in FIG. As shown, after passing the signal input from the signal source through the input matching circuit composed of the first stub 31, the transmission line 32, and the first open stub 32, the amplifier 34 After the amplification process, the output matching circuit composed of the second open stub 35, the transmission line 36, and the second stub portion 37 is configured to pass.

본 발명에서 사용되는 방식은, 입출력, 정합회로의 구성시에 영상신호나 원하지 않는 주파수 대역을 제거하기 위하여개방 스터브를 각각 이용한 것이다.The method used in the present invention is to remove video signals or unwanted frequency bands in the configuration of input / output and matching circuits. Each open stub is used.

즉 초고주파대역에서는개방 스터브는 대역저지특성을 갖는 여파기 또는 공진기로서 사용되기 때문이다. 또한 스터브의 폭과 전송선호의 폭과 길이등을 조정하여 원하는 주파수대역을 선택할 수 있다.In other words, in the ultra high frequency band This is because the open stub is used as a filter or a resonator having band-stopping characteristics. In addition, the desired frequency band can be selected by adjusting the width of the stub and the width and length of the transmission line.

상기와 같이 입, 출력정합회로의 구현시에 기존의 정합회로에개방 스터브를 동시에 사용하면 대역저지특성에 따라서 원하지 않는 주파수를 효과적으로 제거할 수 있다.는 주파수의 파장을 나타낸다.As described above, when the input / output matching circuit is implemented, the existing matching circuit Using open stubs simultaneously can effectively eliminate unwanted frequencies, depending on the bandstop characteristics. Denotes the wavelength of the frequency.

상기 구체예에서 입력정합회로에서는 제개방 스터브(33)를 추가한 상태에서 전송선호A(32)의 길이, 제1스터브(31)의 폭과 길이를 조정하여 신호원으로 바라본 반사계수가 Гopt가 되도록 설계한다.In the above embodiment, in the input matching circuit, In the state in which the open stub 33 is added, the length of the transmission preference A 32 and the width and length of the first stub 31 are adjusted so that the reflection coefficient viewed as a signal source is designed to be gopt.

또한 출력정합회로에서는개방 스터브(35)를 추가한 상태에서 전송선호B(36)의 길이, 제2스터브(37)의 길이와 폭을 조정하여 부하단으로 바라보는 반사계수가 Гs22*가 되도록 설계하였다.In the output matching circuit, With the open stub 35 added, the length of the transmission preference B 36 and the length and width of the second stub 37 were adjusted so that the reflection coefficient viewed at the load end was Гs22 *.

주파변환부는(14)는 상기 저잡음증폭부(12)로부터 출력되는 저압음증폭되고 영상신호가 제거된 수신신호를 입력받은 후에, 타입력단에 연결된 국부발진기(17)의 발진신호와 수신신호를 혼합하여 주파수변환시킨후에, 저역통과필터(15)로 촐력한다. 주파수변환된 신호는 저역통과필터(15) 및 중간주파수증폭부(16)를 통과하면서 통상의 증폭과정을 거쳐서 증폭된다.The frequency converter 14 mixes the oscillation signal and the reception signal of the local oscillator 17 connected to the type power stage after receiving the low-voltage sound-amplified received signal output from the low noise amplifier 12 and the video signal is removed. After the frequency conversion, the low pass filter 15 is output. The frequency-converted signal is amplified through a normal amplification process while passing through the low pass filter 15 and the intermediate frequency amplifier 16.

전술한 바와 같이 본 발명의 저잡음수신기회로는, 저잡음증폭부(12)에 의하여 수신신호대역에서 정합특성을 가지며, 영상신호대역에서는 대역저지특성을 지니도록 구성된 입출력 정합회로부를 구비함으로써, 종래의 저잡음 수신기회로와 같이 영상신호제거용 대역통과필터(BPF)를 구비하지 않고서도, 수신신호의 저잡음증폭과 수신신호에 포함된 영상신호의 제거를 동시에 수행하게 된다.As described above, the low noise receiver circuit of the present invention has an input / output matching circuit section configured to have matching characteristics in the reception signal band by the low noise amplifier 12, and band suppression characteristics in the video signal band, thereby providing a conventional low noise. Even without a band pass filter (BPF) for removing a video signal like a receiver circuit, the low noise amplification of the received signal and the removal of the video signal included in the received signal are simultaneously performed.

따라서, 본 발명에 따를 저잡음 수신기회로는 대역통과필터(BPF)를 사용함으로써 발생되는 신호의 손실을 감소시킬 수 있을 뿐만 아니라, 수신회로를 PCB 기판상에 구현함에 있어서도, 기판상에서 많은 면적을 차지하고 있었던 대역통과필터(BPF) 부분의 면적만큼을 감소시킬 수 있어서 수신기의 소형화를 촉진시킬 수 있는 것이다.Therefore, the low noise receiver circuit according to the present invention not only reduces the loss of the signal generated by using the band pass filter (BPF), but also occupies a large area on the substrate even when the receiver circuit is implemented on the PCB substrate. By reducing the area of the bandpass filter (BPF) portion, it is possible to promote the miniaturization of the receiver.

또한 종래에는 초고주파에서 기판상에 대역통과필터(BPF)를 설계시 소형화를 달성하기 위하여서는 공진기와 공진기 사이의 간격(gab)이 협소하게 되어서, 실제로 PCB 기판상에 수신기회로를 구현하는데 어려움이 있었으나, 본 발명에서는 대역통과필터를 사용하지 않으므로 이러한 어려움이 해결되는 효과가 있는 것이다.In addition, in order to achieve miniaturization when designing a BPF on a substrate at a very high frequency, the gap between the resonator and the resonator is narrow, so that it is difficult to actually implement the receiver circuit on the PCB substrate. In the present invention, since the bandpass filter is not used, this difficulty is solved.

이상에서 설명된 것과 같이, 본 발명에 따른 수신기회로는 저잡음 증폭부가 대역통과필터의 기능도 수행하므로 별도의 대역통과필터를 필요로 하지 않으므로, 대역통과필터의 삽입시 발생되는 전술한 손실과 PCB 기판상에 구현시 에칭으로 인한 특성변화를 최소화시킬 수 있는 것이다.As described above, the receiver circuit according to the present invention does not require a separate bandpass filter because the low noise amplification unit also functions as a bandpass filter, and thus, the above-described loss and PCB substrate generated when the bandpass filter is inserted. When the phase is implemented, it is possible to minimize the characteristic change due to etching.

Claims (1)

전송된 무선신호를 수신하기 위한 안테나(11), 수신된 신호의 잡음을 제거하기 위한 저잡음증폭부(12)와, 국부발진기(17)로부터의 발진신호를 이용하여 저잡음증폭부(12)를 통과한 수신신호를 주파수변환하기 위한 주파수변환부(14)와, 저역통과필터(15) 및 중간주파수(IF) 증폭부(16)를 구비한 저잡음 수신기회로에 있어서, 상기 저잡음증폭부(12)가, 신호원으로부터 입력되는 신호를 통과시키는 제1스터브(31), 전송선호(32), 및개방 스터브(32)로 구성된 입력정합회로; 상기 입력정합회로를 통과한 신호를 증폭하기 위한 증폭부(34); 및 상기 증폭부(34)로부터 출력되는 신호를 통과시키는개방 스터브(35), 전송선호(36), 및 제2스터브(37)로 구성된 출력정합회로로 구성되며, 수신신호주파수대역에서는 정합특성을 가지며, 영상신호주파수대역에서는 대역저지특성을 가지는 것을 특징으로 하는 저잡음 수신기회로.The low noise amplifier 12 passes through the antenna 11 for receiving the transmitted radio signal, the low noise amplifier 12 for removing noise of the received signal, and the oscillation signal from the local oscillator 17. In the low noise receiver circuit having a frequency converter 14 for frequency converting a received signal, a low pass filter 15 and an intermediate frequency (IF) amplifier 16, the low noise amplifier 12 A first stub 31 for transmitting a signal input from a signal source, a transmission preference 32, and An input matching circuit composed of an open stub 32; An amplifier 34 for amplifying the signal passing through the input matching circuit; And to pass the signal output from the amplifier 34 It is composed of an output matching circuit composed of an open stub 35, a transmission line 36, and a second stub 37, and has a matching characteristic in a reception signal frequency band, and a band stopping characteristic in a video signal frequency band. Low noise receiver circuit.
KR1019930009063A 1993-05-25 1993-05-25 Lnb KR960007134B1 (en)

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