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首页> 外文期刊>Microwave Journal >DESIGN AND OPERATION OF AUTOMATIC GAIN CONTROL LOOPS FOR RECEIVERS IN MODERN COMMUNICATIONS SYSTEMS
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DESIGN AND OPERATION OF AUTOMATIC GAIN CONTROL LOOPS FOR RECEIVERS IN MODERN COMMUNICATIONS SYSTEMS

机译:现代通信系统中接收机的自动增益控制环的设计与操作

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摘要

This article is intended to provide insight into the effective operation of variable gain amplifiers (VGA) in automatic gain control (AGC) applications. Figure 1 is a general block diagram for an AGC loop. The input signal passes through the VGA to produce the output level to be stabilized. The detector's output is compared against a setpoint voltage to produce an error signal, which is then integrated to produce a gain control voltage. This is applied to the control input of the VGA. The attenuator shown between the VGA and the detector is used to align the maximum output level of the VGA with the maximum input level of the detector. In the course of this article several key issues will be addressed, including VGA types, loop dynamics, detector types, the operating level of VGA and the operating level of the detector. Then an example application revolving around an AD8367 VGA will be presented for further discussion of the material.
机译:本文旨在深入了解可变增益放大器(VGA)在自动增益控制(AGC)应用中的有效操作。图1是AGC环路的一般框图。输入信号通过VGA以产生稳定的输出电平。将检测器的输出与设定点电压进行比较,以产生误差信号,然后将其积分以产生增益控制电压。这适用于VGA的控制输入。 VGA和检测器之间显示的衰减器用于将VGA的最大输出电平与检测器的最大输入电平对齐。在本文的过程中,将解决几个关键问题,包括VGA类型,环路动态特性,检测器类型,VGA的操作级别和检测器的操作级别。然后,将介绍一个围绕AD8367 VGA的示例应用,以进一步讨论该材料。

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