一种宽频带大动态AGC电路设计

doi:10.16180/j.cnki.issn1007-7820.2021.02.010

Abstract

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

CLC Number:

TN850.3

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

Figures/Tables 6

Figure 1.

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Table 1

References 16

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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

Design of a Broadband Large Dynamic AGC Circuit

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