KR950002065B1 - Low noise amplifier for satellite receiver - Google Patents

Low noise amplifier for satellite receiver Download PDF

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KR950002065B1
KR950002065B1 KR1019920021894A KR920021894A KR950002065B1 KR 950002065 B1 KR950002065 B1 KR 950002065B1 KR 1019920021894 A KR1019920021894 A KR 1019920021894A KR 920021894 A KR920021894 A KR 920021894A KR 950002065 B1 KR950002065 B1 KR 950002065B1
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South Korea
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transmission line
low noise
circuit
amplifier
matching circuit
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KR1019920021894A
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Korean (ko)
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KR940012807A (en
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안진호
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삼성전기주식회사
황선두
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/56—Modifications of input or output impedances, not otherwise provided for
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/60—Amplifiers in which coupling networks have distributed constants, e.g. with waveguide resonators
    • H03F3/602—Combinations of several amplifiers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microwave Amplifiers (AREA)
  • Amplifiers (AREA)

Abstract

The circuit equalizes the gain and noise characteristics, and improves the distortion of signal and group delay characteristics. The circuit includes the 1st, 2nd amplifiers, the input, output matching circuit of 1st and 2nd amplifiers, the 1st transmission line which transfers the output of 1st amplifier to the input matching circuit, the 2nd transmission line and resistor which transfer DC bias source to the 1st transmission line, a feedback circuit which includes the 1st transmission line and capacitor.

Description

위성방송수신용 저잡음증폭회로Low noise amplifier circuit for satellite broadcasting

제1도는 종래의 위성방송수신용, 저잡음 증폭회로도.1 is a conventional low noise amplification circuit for satellite broadcasting.

제2도는 본 발명에 따른 위성방송수신용 저잡음 증폭회로도.2 is a low noise amplification circuit diagram for satellite broadcasting according to the present invention.

제3도는 본 발명에 따른 위성방송수신용 저잡음 증폭회로의 이득 및 잡음특성을 나타내는 그래프.3 is a graph showing gain and noise characteristics of a low noise amplifier circuit for satellite broadcasting according to the present invention.

본 발명은 위성방송수신용 저잡음 증폭회로에 관한 것으로, 특히 3.7GHz~ 4.2GHz의 광대역 위성방송신호의 주파수에 따른 이득편차 및 잡음특성의 불균일을 개선하여 전대역의 평탄한 이득특성과 균일하고 낮은 잡음특성을 갖는 위상방송수신용 저잡음 증폭회로에 관한 것이다.The present invention relates to a low noise amplification circuit for satellite broadcasting reception. In particular, a flat gain characteristic and a uniform low noise characteristic of the entire band can be improved by improving the gain variation and the nonuniformity of the noise characteristic according to the frequency of the broadband satellite broadcasting signal of 3.7 GHz to 4.2 GHz. The present invention relates to a low noise amplifier circuit for receiving phase broadcasting.

일반적으로 위성방송수신용 저잡음 주파수 변환장치(LNB)는 공중의 RF신호를 받아 IF신호로 변환하여 출력시키는 것으로 그 내부구성은 크게 3부분으로 나뉘어진다. 이에 대해 좀더 상세히 언급하면, 상기 저잡음 주파수 변환장치(LNB)는 저잡음 증폭단과 믹서단 및 국부발진단으로 구성되고 있고 상기 저잡음 주파수 변환장치(LNB)의 특성에 큰 영향을 미치는 부분은 저잡음 증폭단이며 그중에서도 특히 정합회로에 의해 저잡음 주파수 변환장치의 특성이 좌우된다.In general, a low noise frequency converter (LNB) for receiving a satellite broadcast receives an RF signal from the air, converts it into an IF signal, and outputs the IF signal. In detail, the low noise frequency converter (LNB) is composed of a low noise amplifier stage, a mixer stage, and a local oscillation stage, and a part that has a great influence on the characteristics of the low noise frequency converter (LNB) is a low noise amplifier stage. In particular, the matching circuit determines the characteristics of the low noise frequency converter.

제1도에 도시한 바와 같이 종래의 위성방성 수신용 저잡음 증폭회로는 제1저잡음증폭기(Q1)의 전단 및 후단에는 입력정합회로(M1) 및 출력정합회로(M2)가 각각 연결되고, 제2저잡음증폭기(Q2)는 전단 및 후단에는 입력 정합회로(M3) 및 출력정합회로(M4)가 각각 연결된다.As shown in FIG. 1, in the conventional low noise amplification circuit for satellite radio reception, an input matching circuit M 1 and an output matching circuit M 2 are connected to the front and rear ends of the first low noise amplifier Q 1 , respectively. The second low noise amplifier Q 2 is connected to an input matching circuit M 3 and an output matching circuit M 4 at the front and rear ends thereof, respectively.

여기서 입력 정합회로(M3) 및 출력정합회로(M2)(M4)는 T자형의 전송선로와 오픈스터브(open stub)로 구성된다.Here, the input matching circuit M 3 and the output matching circuit M 2 (M 4 ) are composed of a T-shaped transmission line and an open stub.

입력정합회로(M1)에서는 DC 바이어스(B-)가 초크코일(L1)을 통하여 마이크로 스트립라인의 전송선로(S1)에 인가되고 입력신호가 입력단(In)을 통하여 역 ㄱ자형의 상기 마이크로 스트립라인(μ-strip) 코일(L2)을 통하여 제1저잡음 증폭기(Q1)의 게이트에 출력된다.In the input matching circuit M 1 , a DC bias B − is applied to the transmission line S 1 of the microstrip line through the choke coil L 1 , and the input signal is inverted-shaped through the input terminal In. It is output to the gate of the first low noise amplifier Q 1 through the micro stripline coil L 2 .

이때 상기 제1저잡음 증폭기(Q1)의 소오스(S)는 접지되고 드레인(D)은 제1저잡음 증폭기(Q1)의 증폭된 출력신호를 출력정합회로(M2)에 인가시킨다.At this time, the source S of the first low noise amplifier Q 1 is grounded, and the drain D applies the amplified output signal of the first low noise amplifier Q 1 to the output matching circuit M 2 .

또한 출력정합회로(M2)에서는 DC 바이어스(B+)가 초크코일(L3)을 통하여 마이크로스트립라인의 전송선로(S2)에 인가되고 제1저잡음 증폭기(Q1)의 증폭된 출력신호가 T자형의 마이크로 스트립라인의 전송선로(S2)에 입력되며, DC성분을 차단하는 커패시터(C1)를 통하여 제2저잡음 증폭기(Q2)의 입력정합회로(M3)에 출력된다.In addition, in the output matching circuit M 2 , a DC bias B + is applied to the transmission line S 2 of the microstrip line through the choke coil L 3 and the amplified output signal of the first low noise amplifier Q 1 . Is input to the transmission line (S 2 ) of the T-shaped micro stripline, and is output to the input matching circuit (M 3 ) of the second low noise amplifier (Q 2 ) through a capacitor (C1) that blocks the DC component.

한편, 상기 입력정합회로(M3)에서는 초크코일(L3)을 통하여 DC바이어스(B-)가 전송선로(S3)에 인가되고 상기 제1저잡음 증폭기(Q1)의 출력신호가 제2저잡음 증폭기(Q2)의 게이트에 출력된다. 그리고 상기 제2저잡음 증폭기(Q2)의 소오스(S)는 접지되고 드레인(D)은 제2저잡음 증폭기(Q2)의 증폭된 출력신호를 출력정합회로(M4)에 인가시킨다.Meanwhile, in the input matching circuit M 3 , a DC bias B − is applied to the transmission line S 3 through the choke coil L 3 , and an output signal of the first low noise amplifier Q 1 is applied to the second line. It is output to the gate of the low noise amplifier Q 2 . The source S of the second low noise amplifier Q 2 is grounded and the drain D applies the amplified output signal of the second low noise amplifier Q 2 to the output matching circuit M 4 .

또한, 출력정합회로(M4)에서는 상기 DC 바이어스(B+)가 초크코일(L4)을 통하여 마이크로 스트립라인의 전송선로(S4)에 인가되고 제2저잡음 증폭기(Q4)의 증폭된 출력신호가 T자형 마이크로 스트립라인의 전송선로(S4)에 입력되며 DC성분을 차단하는 커패시터(C4)를 통하여 출력단(out)에 출력된다.In addition, in the output matching circuit M 4 , the DC bias B + is applied to the transmission line S 4 of the micro strip line through the choke coil L 4 and amplified by the second low noise amplifier Q 4 . The output signal is input to the transmission line S 4 of the T-shaped micro stripline and output to the output terminal through the capacitor C 4 which blocks the DC component.

따라서, 종래의 저잡음 증폭회로는 각 정합회로가 광대역 특성을 만족시키는데 한계가 있어 제3도의 점선으로 나타난 바와 같이 주파수가 높아질수록 이득이 낮아지고 이에따라 잡음지수 또한 열화되는 문제점을 갖고 있다.Therefore, the conventional low noise amplifier circuit has a problem in that each matching circuit has a limitation in satisfying the broadband characteristics. As shown by a dotted line in FIG. 3, the gain decreases as the frequency increases, and thus the noise figure also deteriorates.

본 발명은 상기한 문제점을 해결하기 위하여 광대역의 주파수에 따른 이득특성과 잡음특성을 균일하게 할 수 있는 위성방송수신용 저잡음 증폭회로를 제공하는데 그 목적이 있다.An object of the present invention is to provide a low-noise amplifier circuit for satellite broadcasting that can uniformize the gain characteristics and noise characteristics according to the broadband frequency in order to solve the above problems.

본 발명은 상기한 목적을 달성하기 위하여 제1, 2증폭기와, 제1증폭기의 입, 출력정합회로와, 제2증폭기의 입, 출력정합회로를 포함하는 위성방송 수신용 저잡음 증폭회로에 있어서, 상기 제1증폭기의 출력정합회로가 상기 제1증폭기의 출력을 상기 제2증폭기의 입력정합회로에 전달하는 제1전송선로와, DC 바이어스 전원을 상기 제1전송선로의 일측에 전달하는 제2전송선로 및 저항과, 상기 제1전송선로의 타측과 상기 전송선로의 소정영역을 연결하는 커패시터를 포함하는 것을 특징으로 한다.In order to achieve the above object, the present invention provides a low-noise amplification circuit for satellite broadcasting including a first and a second amplifier, an input and output matching circuit of a first amplifier, and an input and output matching circuit of a second amplifier, A first transmission line for transmitting the output of the first amplifier to the input matching circuit of the second amplifier by the output matching circuit of the first amplifier, and a second transmission line for transmitting DC bias power to one side of the first transmission line And a capacitor connecting the furnace and the resistor and the other side of the first transmission line to a predetermined region of the transmission line.

이하 본 발명을 도면을 참조하여 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the drawings.

제2도를 참조하면, 제1저잡음증폭기(Q11)의 전단 및 후단에는 입력정합회로(Q11) 및 출력정합회로(M12)가 각각 연결되고, 제2저잡음증폭기(Q12)의 전단 및 후단에는 입력정합회로(M13) 및 출력정합회로(M14)가 각각 연결된다. 여기서, 입력정합회로(M11), (M13) 침 출력정합회로(M14)는 T자형의 전송선로와 오픈스터브로 구성된다.2, an input matching circuit Q 11 and an output matching circuit M 12 are connected to the front end and the rear end of the first low noise amplifier Q 11, respectively, and the front end of the second low noise amplifier Q 12 . An input matching circuit (M 13 ) and an output matching circuit (M 14 ) are connected to the rear stage and the rear side, respectively. Here, the input matching circuit (M 11 ), (M 13 ) needle output matching circuit (M 14 ) is composed of a T-shaped transmission line and an open stub.

입력정합회로(M11)에서는 DC바이어스(B2)가 저항(R11)을 통하여 전송선로(S11)에 인가되고 프로우브에서 검출된 위성방송의 입력신호가 입력단(In)을 통하여 입력되며 코일(L11)을 통하여 제1저잡음 증폭기(Q1)의 게이트에 출력된다.In the input matching circuit M 11 , the DC bias B 2 is applied to the transmission line S 11 through the resistor R 11 , and the input signal of the satellite broadcast detected by the probe is input through the input terminal In. It is output to the gate of the first low noise amplifier Q 1 through the coil L 11 .

이때 상기 저잡음 증폭기(Q11)의 소오스(S)는 접지되고 드레인(D)은 출력정합회로(M12)의 전송선로(S12)에 연결된다.At this time, the source S of the low noise amplifier Q 11 is grounded and the drain D is connected to the transmission line S 12 of the output matching circuit M 12 .

또한 출력정합회로(M12)에서는 제1저잡음증폭기(Q11)의 증폭된 출력신호가 T자형의 전송선로(S12)에 입력되고 DC성분을 차단하는 커패시터(C11)를 통하여 제2저잡음 증폭기(Q12)의 입력정합회로(M13)에 인가된다.In addition, in the output matching circuit M 12 , the amplified output signal of the first low noise amplifier Q 11 is input to the T-shaped transmission line S 12 and the second low noise through the capacitor C 11 blocking the DC component. It is applied to the input matching circuit M 13 of the amplifier Q 12 .

그리고 DC 바이어스(B+)가 ㄴ과 ㄱ자가 합쳐진 형태를 가지고 길이가 1/4λ되는 바이어스용 전송선로(S22) 및 저항(R12)을 통하여 상기 전송선로(S12)에 인가되고 커패시터(C22)는 전송선로(S12)와 바이어스용 전송선로(S22)의 소정의 지점사이에 연결된다.In addition, DC bias B + is applied to the transmission line S 12 through a bias transmission line S 22 and a resistor R 12 having a form where b and a letter are combined and having a length of 1 / 4λ. C 22 is connected between the transmission line S 12 and a predetermined point of the bias transmission line S 22 .

한편, 출력정합회로(M12)에 대해 좀더 상세히 언급하면, DC 바이어스(B-)가 인가되는 지점인 전송선로(S22)의 입력단은 바이패스용 커패시터(C24)를 통하여 접지된다. 이리하여 전송선로(S22)의 입력단은 AC적으로 접지되어 있다고 볼수 있으며 저항(R12)과 커패시터(C24) 사이의 전송선로(S22)의 길이는 상기 전송선로(S22)의 임피던스가 무한대가 될 수 있도록 1/4λ로 형성된다. 여기서 λ는 입력되는 위성방송신호의 파장길이를 나타내는 것이다.Meanwhile, referring to the output matching circuit M 12 in more detail, the input terminal of the transmission line S 22 , which is the point where the DC bias B − is applied, is grounded through the bypass capacitor C 24 . Thus, it can be seen that the input terminal of the transmission line S 22 is AC grounded, and the length of the transmission line S 22 between the resistor R 12 and the capacitor C 24 is the impedance of the transmission line S 22 . Is formed in 1 / 4λ so that can be infinite. Where λ represents the wavelength of the input satellite broadcast signal.

이때 저항(R12)과 커패시터(C22)와 전송선로(S12), (S22)에는 폐회로(loop)가 형성되므로 출력정합회로(M12)의 출력은 커패시터(C22), 전송선로(S22) 및 저항(R12)을 통하여 궤환(feed back)된다. 이에따라 이득 및 잡음지수는 제3도의 실선으로 나타난 바와 같이 3.7~4.2GHz의 주파수범위에서 거의 일정하게 된다.In this case, since a closed loop is formed in the resistor R 12 , the capacitor C 22 , the transmission lines S 12 , and S 22 , the output of the output matching circuit M 12 is the capacitor C 22 , the transmission line. Feed back through S 22 and resistor R 12 . As a result, the gain and noise figure are nearly constant over the frequency range of 3.7 to 4.2 GHz, as shown by the solid line in FIG.

따라서, 본 발명은 저항과 커패시터와 전송선로에 의한 폐회로를 추가시켜 고주파수 대역에서의 이득 및 잡음특성을 개선시키는 궤환회로를 형성시킴으로써 전대역의 이득특성을 균일하게하여 이득의 불균일로 인한 신호의 왜곡 및 그룹(group) 지연을 개선하고 잡음지수 또한 균일하게 효과가 있게 된다.Therefore, the present invention forms a feedback circuit that improves the gain and noise characteristics in the high frequency band by adding a closed circuit by a resistor, a capacitor, and a transmission line, thereby making the gain characteristics of the entire band uniform and thus the distortion of the signal due to uneven gain. The group delay is improved and the noise figure is uniformly effective.

Claims (4)

제1, 2 증폭기와, 제1증폭기의 입, 출력정합회로와, 제2증폭기의 입, 출력정합회로를 포함하는 위성방송수신용저잡음 증폭회로에 있어서, 상기 제1증폭기의 출력정합회로가 상기 제1증폭기의 출력을 상기 제2증폭기의 입력정합회로에 전달하는 제1전송선로와, DC 바이어스전원을 상기 제1전송선로의 일측에 전달하는 제2전송선로 및 저항과, 상기 제1전송선로의 타측과 상기 전송선로의 소정영역을 연결하는 커패시터를 포함하여 궤환회로를 형성하는 것을 특징으로 하는 위성방송수신용 저잡음 증폭회로.A low noise amplifying circuit for satellite broadcasting reception comprising first and second amplifiers, input and output matching circuits of a first amplifier, and input and output matching circuits of a second amplifier, wherein the output matching circuit of the first amplifier includes: A first transmission line for transmitting the output of the first amplifier to an input matching circuit of the second amplifier, a second transmission line and a resistor for transmitting DC bias power to one side of the first transmission line, and the first transmission line And a feedback circuit comprising a capacitor connecting the other side of the transmission line with a predetermined region of the transmission line. 제1항에 있어서, 상기 제2전송선로와 저항은 직렬 연결되는 것을 특징으로 하는 위성방송수신용 저잡음 증폭회로.The low noise amplifier circuit of claim 1, wherein the second transmission line and the resistor are connected in series. 제1항에 있어서, 상기 제1, 2전송선로의 일측은 커패시터를 통하여 접지되는 것을 특징으로 하는 위성방송수신용 저잡음 증폭회로.The low noise amplifier circuit of claim 1, wherein one side of the first and second transmission lines is grounded through a capacitor. 제1항에 있어서, 상기 제2전송선로는 ㄴ과 ㄱ자가 합쳐진 형태인 것을 특징으로 하는 위성방송수신용 저잡음 증폭회로.The low noise amplifier circuit for satellite broadcasting reception according to claim 1, wherein the second transmission line is formed by combining b and b.
KR1019920021894A 1992-11-20 1992-11-20 Low noise amplifier for satellite receiver KR950002065B1 (en)

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KR1019920021894A KR950002065B1 (en) 1992-11-20 1992-11-20 Low noise amplifier for satellite receiver

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KR950002065B1 true KR950002065B1 (en) 1995-03-10

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