一种宽频带大动态AGC电路设计

doi:10.16180/j.cnki.issn1007-7820.2021.02.010

电子科技 ›› 2021, Vol. 34 ›› Issue (2): 57-61.doi: 10.16180/j.cnki.issn1007-7820.2021.02.010

一种宽频带大动态AGC电路设计

毛云山,尉旭波

电子科技大学电子科学与工程学院,四川成都 611731

收稿日期:2019-11-07 出版日期:2021-02-15 发布日期:2021-01-22
作者简介:毛云山(1994-),男,硕士研究生。研究方向:微波集成器件。|尉旭波(1980-),男,副教授。研究方向:微波射频器件的宽带和高线性化、功率磁性器件的小型化和高压特种电源。
基金资助:
国家自然科学基金(61471086)

Design of a Broadband Large Dynamic AGC Circuit

MAO Yunshan,WEI Xubo

School of Electronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China

Received:2019-11-07 Online:2021-02-15 Published:2021-01-22
Supported by:
National Natural Science Foundation of China(61471086)

摘要/Abstract

摘要：

针对自动增益控制电路高频率、宽频带及大动态的需求,设计了一款高频宽带大动态AGC电路。文中通过采用AGC耦合信号窄带化的方式,解决了宽带电路躁底抬高导致功率检测不准的问题。此外,文中采用两级压控增益放大器级联的方式实现了AGC电路的大动态,并加入输入输出放大滤波电路,提高了信号纯度。根据文中设计,实测AGC电路在信号频率为2 GHz且信号带宽200 MHz时的动态范围有100 dB。与传统AGC电路相比,新方法提高了适用频率及带宽。

关键词: 自动增益控制, 高频, 宽带, 大动态, 功率检测, 压控增益放大器

Abstract:

A high-frequency broadband large dynamic AGC circuit is designed for the high frequency, wide frequency band and large dynamics of automatic gain control circuits. In this paper, the problem of inaccurate power detection caused by the bottoming of the wideband circuit is solved by adopting the narrow banding method of the AGC coupling signal, and the large dynamic of the AGC circuit is realized by the cascade control of the two-stage voltage-controlled gain amplifier. The input and output amplification filter circuit is added to improve signal purity. According to the design, the measured AGC circuit has a dynamic range of 100 dB when the signal frequency is 2 GHz and the signal bandwidth is 200 MHz, which improves the applicable frequency and bandwidth when compared with the conventional AGC circuit.

Key words: AGC, high-frequency, broadband, large dynamic, power detection, VGA

中图分类号:

TN850.3

毛云山,尉旭波. 一种宽频带大动态AGC电路设计[J]. 电子科技, 2021, 34(2): 57-61.

MAO Yunshan,WEI Xubo. Design of a Broadband Large Dynamic AGC Circuit[J]. Electronic Science and Technology, 2021, 34(2): 57-61.

图/表 6

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输入信号功率/dBm	输出信号功率/dBm	谐杂波抑制/dBc
-95	-23.0	70
-90	-20.9	69
-80	-20.8	70
-60	-19.8	71
-40	-20.0	69
-20	-20.8	70
-10	-20.5	70
0	-20.0	69
10	-19.2	65

一种宽频带大动态AGC电路设计

Design of a Broadband Large Dynamic AGC Circuit

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