High speed large dynamic range digital automatic gain control circuit

An automatic gain control, large dynamic range technology, applied in gain control, amplification control, electrical components and other directions, can solve the problem of not including signal peak digitization function, low threshold detection sensitivity, affecting control accuracy and other problems, to achieve simple design, The effect of reducing difficulty and improving comparison accuracy

Inactive Publication Date: 2009-04-29
BEIJING MXTRONICS CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the AGC widely used in laser detector processing devices does not include the signal peak digitization function, and cannot effectively pro

Method used

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  • High speed large dynamic range digital automatic gain control circuit
  • High speed large dynamic range digital automatic gain control circuit
  • High speed large dynamic range digital automatic gain control circuit

Examples

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Embodiment Construction

[0017] Such as figure 1 As shown, it is a structural principle block diagram of the digital automatic gain control circuit of the present invention, which is composed of a variable gain amplifier 1, a high-speed peak hold device 2, a low-pass filter 3, an AD converter 4, a digital signal range judgment and a gain controller 5 The digital-analog hybrid feedback loop is realized, and the reference voltage source and current source 6 provide the voltage source or current source required for other devices to work. In addition, in order to facilitate the interface and operation of processors such as CPU and DSP, the analog signal after automatic gain, the digital signal after AD conversion, and the gain state are all used as output signals, and are output through the gain state and AD conversion serial bus interface circuit 7.

[0018] First, according to the characteristics of the input signal and the application requirements, the initial gain and the upper and lower limits of the...

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PUM

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Abstract

The invention provides a high-speed large dynamical range digital automatic gain control circuit, comprising a variable gain amplifier, a high-speed peak retainer, a lowpass filter, an A/D converter and a digital signal range judging and gain controller; the gain of an externally input pulse voltage signal is controlled by the variable gain amplifier and sent to the high-speed peak retainer which widens the peak of the received signal and sends the signal to the lowpass filter so as to carry out analog filtration; the output signal of the lowpass filter is converted by the A/D converter and then sent to the digital signal range judging and gain controller which compares the received digital signal with a valve value arranged in advance and controls the amplification multiple of the variable gain controller according to the comparison result. The AGC circuit has simple structure and high control precision.

Description

technical field [0001] The invention relates to an automatic gain control circuit, in particular to a digital automatic gain control circuit applied to a high-speed and large dynamic range signal processing and detection device of a laser detector. Background technique [0002] Automatic gain control circuit, referred to as AGC circuit for short, digital AGC circuit is a kind of AGC circuit widely used at present, its main function is, when the input signal voltage amplitude exceeds or falls below a certain threshold value, the output voltage will adjusted within a certain range. Specifically, when the input signal is very weak, the automatic gain control circuit increases the gain to increase the amplifier gain; when the input signal is strong, the automatic gain control circuit suppresses the gain to reduce the amplifier gain, and finally The input signal amplitude is adjusted within a certain set threshold range. [0003] The signal received by the laser detector signal...

Claims

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Application Information

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IPC IPC(8): H03G3/20
Inventor 李虎明张奇荣
Owner BEIJING MXTRONICS CORP
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