KR970072779A - RF signal level adjustment circuit in wireless relay system - Google Patents

RF signal level adjustment circuit in wireless relay system Download PDF

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Publication number
KR970072779A
KR970072779A KR1019960010032A KR19960010032A KR970072779A KR 970072779 A KR970072779 A KR 970072779A KR 1019960010032 A KR1019960010032 A KR 1019960010032A KR 19960010032 A KR19960010032 A KR 19960010032A KR 970072779 A KR970072779 A KR 970072779A
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KR
South Korea
Prior art keywords
signal
level
output
amplifier
relay system
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Application number
KR1019960010032A
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Korean (ko)
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KR0168024B1 (en
Inventor
이재홍
Original Assignee
정장호
Lg 정보통신주식회사
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Publication date
Application filed by 정장호, Lg 정보통신주식회사 filed Critical 정장호
Priority to KR1019960010032A priority Critical patent/KR0168024B1/en
Publication of KR970072779A publication Critical patent/KR970072779A/en
Application granted granted Critical
Publication of KR0168024B1 publication Critical patent/KR0168024B1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
    • H04B7/15535—Control of relay amplifier gain
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
    • H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements
    • H03G1/0052—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using diodes
    • H03G1/0058—PIN-diodes

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)

Abstract

본 발명은 무선중계시스템에서 수신하는 RF(Radio Frequency)신호의 레벨을 조정해 주는 회로에 관한 것으로 특히 업페이딩(upfading)에 의해 발생하는 RF신호의 레벨을 감쇠해줌으로써 비선형 왜곡에 의해 발생하는 잡음레벨이 제거되도록 하는 무선중계시스템에서 RF신호 레벨 조정 회로에 관한 것이다. 즉 본 발명은 무선중계시스템에서 흔히 발생하는 RF신호의 페이딩 현상으로 인하여 믹서가 포화영역에서 동작하게 되는 경우 발생하는 신호 왜곡을 방지하기 위해 6GHz 이상의 대역에서 페이딩된 RF신호가 기준보다 높을 때 핀 다이오드의 직렬저항 값을 줄임으로써 RF신호를 바이패스시키는 장치를 제공함을 목적으로 한다. 이에 따라 무선중계시스템에서 수신하는 RF신호가 페이딩 현상에 의해 신호 왜곡이 발생하였을 경우 자동 이득제어에 의해 신호 레벨을 미세하게 조정할 수 있게 되어 신호 보상이 효과적으로 이루어지게 된다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit for adjusting the level of a radio frequency (RF) signal received in a radio relay system, and more particularly to a circuit for attenuating a level of an RF signal generated by up- Level to the RF signal level adjustment circuit in a radio relay system. That is, in order to prevent signal distortion caused when a mixer operates in a saturation region due to a fading phenomenon of an RF signal frequently occurring in a radio relay system, when a fading RF signal in a band of 6 GHz or more is higher than a reference, To reduce the series resistance of the RF signal, thereby bypassing the RF signal. Accordingly, when signal distortion occurs due to a fading phenomenon of an RF signal received in a radio relay system, the signal level can be finely adjusted by automatic gain control, and signal compensation can be effectively performed.

Description

무선중계시스템에서 RF신호 레벨 조정 회로RF signal level adjustment circuit in wireless relay system

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is a trivial issue, I did not include the contents of the text.

제3도는 본 발명에 따른 RF신호 레벨 조정회로의 회로 구성도, 제4도는 제3도에서 제2반전 증폭기의 출력전압에 대한 제3반전 증폭기의 출력전압 상태에 대한 일실시예도이다.FIG. 3 is a circuit diagram of an RF signal level adjusting circuit according to the present invention. FIG. 4 is an embodiment of the output voltage state of the third inverting amplifier with respect to the output voltage of the second inverting amplifier in FIG.

Claims (1)

안테나를 통해 RF신호를 입력하여 이에 대한 저잡음을 없애고자 증폭하는 저잡음 증폭기와, 입력된 RF신호의 레벨이 높을 경우 이 레벨을 낮추기 위해 그 신호의 일부를 바이패스시키는 핀 다이오드를 포함하는 저잡음 증폭부와; 상기 저잡음 증폭부의 출력을 국부발진기의 기준주파수와 믹싱하여 IF신호로 변환시키는 믹서와; 상기 믹서에서 출력되는 IF신호의 레벨을 측정하여 기준보다 높으면 상기 저잡음 증폭부의 핀 다이오드로의 전류량을 증가시키는 자동이득제어회로를 포함하는 무선중계시스템에서 RF신호 레벨 조정 회로에 있어서, 상기 자동이득제어회로는 상기 믹서에서 출력되는 IF 신호를 증폭하는 증폭기와 ; 상기 증폭기의 출력을 적분하여 DC레벨로 출력하는 적분기와 ; 상기 적분기의 출력이 양의 값일 경우에는 동작을 하지않고, 음의 값일 경우에는 제1입력저항과 제1피드백 저항의 비에 따라 정해지는 이득만큼 DC증폭을 하여 반전시키는 제1반전 증폭기와; 상기 제1반전 증폭기의 제2입력저항과 제2피드백 저항의 비에 따라 정해지는 이득만큼 DC증폭을 하여 반전시키고, 상기 제2입력저항의 출력값과 함께 입력되는 전압에 의해 DC레벨을 조정하는 제2반전 증폭기와; 상기 제2반전 증폭기의 제3입력저항과 제3피드백 저항의 비에 따라 정해지는 이들만큼 DC증폭을 하여 반전시키고, 이를 상기 저잡음 증폭부의 핀 다이오드로 전류를 공급해주는 각각의 저항으로 출력하는 제3반전 증폭기를 포함하는 것을 특징으로 하는 무선중계시스템에서 RF신호 레벨 조정 회로.A low noise amplifier for inputting an RF signal through an antenna and amplifying the RF signal for eliminating low noise therefrom and a pin diode for bypassing a part of the RF signal to lower the level of the RF signal when the level of the RF signal is high, Wow; A mixer for mixing the output of the low noise amplifier with a reference frequency of the local oscillator and converting the mixed signal into an IF signal; And an automatic gain control circuit that measures the level of the IF signal output from the mixer and increases the amount of current to the pin diode of the low noise amplifier if the level of the IF signal is higher than a reference, The circuit includes an amplifier for amplifying the IF signal output from the mixer; An integrator for integrating an output of the amplifier and outputting the integrated signal at a DC level; A first inverting amplifier which does not operate when the output of the integrator is a positive value and inverts a DC gain by a gain determined according to a ratio of the first input resistor and the first feedback resistor when the output is negative; A second inverting amplifier for inverting the output of the second inverting amplifier by a gain determined according to the ratio of the second input resistance and the second feedback resistor, 2 inverting amplifier; And a third feedback resistor for inverting the output of the second inversion amplifier by a predetermined amount according to the ratio of the third input resistance and the third feedback resistor, and outputting the inverted DC output to each of the resistors for supplying current to the pin diode of the low- Wherein the RF signal level adjustment circuit comprises an inverting amplifier. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: It is disclosed by the contents of the first application.
KR1019960010032A 1996-04-03 1996-04-03 Circuit for controlling rf signal level in a wireless relay system KR0168024B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019960010032A KR0168024B1 (en) 1996-04-03 1996-04-03 Circuit for controlling rf signal level in a wireless relay system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019960010032A KR0168024B1 (en) 1996-04-03 1996-04-03 Circuit for controlling rf signal level in a wireless relay system

Publications (2)

Publication Number Publication Date
KR970072779A true KR970072779A (en) 1997-11-07
KR0168024B1 KR0168024B1 (en) 1999-02-01

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100378826B1 (en) * 2001-05-21 2003-04-03 엘지전자 주식회사 Digital television translator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100378826B1 (en) * 2001-05-21 2003-04-03 엘지전자 주식회사 Digital television translator

Also Published As

Publication number Publication date
KR0168024B1 (en) 1999-02-01

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