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Automatic gain control device based on data chain terminal machine

A technology of automatic gain control and data link, which is applied in the field of information processing and can solve the problems of sensitivity to changes in system parameters and slow action.

Inactive Publication Date: 2015-03-11
NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of the open-loop AGC system is that when the input signal amplitude changes, the circuit can still maintain the same output amplitude, and this structure has the advantage of rapid time establishment; the disadvantage is that it is sensitive to changes in system parameters and slow in action

Method used

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  • Automatic gain control device based on data chain terminal machine
  • Automatic gain control device based on data chain terminal machine
  • Automatic gain control device based on data chain terminal machine

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0013] Due to the ionospheric fading and the change of receiving signal conditions, the signal level at the input terminal will change in a relatively large range due to the signal received by the data link end machine. The present invention keeps the output level of the receiver at a minimum by using the AGC control method. The range changes or is basically stable, which can achieve the best reception of information.

[0014] What the present invention adopted is a structural block diagram of a feedback type AGC, and this type of AGC generally includes a variable gain amplifier (VGA), three main parts of a loop filter and a peak detector. The signal strength of the variable gain amplifier (VGA) is detected by the peak detector, and a DC voltage is generated and compared wi...

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Abstract

The invention provides an automatic gain control (AGC) device based on a data chain terminal machine. The AGC device comprises a comparator, a variable gain amplifier (VGA) and a peak detector, wherein the selection of the VGA includes the aspects of effective range of control voltage, variable gain range, working frequency range and frequency response of the VGA, and the like; a functional relationship between the gain of the VGA and the control voltage is linear, exponential, logarithmic and the like; the gain of the VGA based on the exponential functional relationship has a relatively wide change range in comparison with that of the VGA based on the linear functional relationship. According to the AGC device, the VGA realizing AGC adopts a method combining exponential and linear gain characteristics, as the VGA with the linear gain characteristics can enable a small signal to be better amplified, the VGA with the exponential gain characteristics can enable a large signal to be in an amplitude limiting region, and then the dynamic range of AGC can be greatly expanded.

Description

technical field [0001] The invention belongs to the technical field of information processing and relates to a gain control device. Background technique [0002] When the wireless communication receiver is working, the output level of the receiver depends on the input signal level and the gain of the receiver. Affected by various factors such as propagation fading, the input signal of the receiver often varies widely. When it is weak, it can be a few microvolts or tens of microvolts. When the signal is strong, it can get hundreds of millivolts or even greater, which is the strongest. The difference between the signal voltage and the weakest signal voltage can reach tens of decibels. Obviously, when receiving a weak signal, it is hoped that the gain of the receiver is high, and when receiving a strong signal, it is hoped that its gain is low, so that the output signal can maintain an appropriate level. level, it will not fail to work normally because the input signal is too ...

Claims

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Application Information

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IPC IPC(8): H04B1/12H03G3/20
Inventor 李晓冬王辉球魏海刚黄振
Owner NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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