CMOS automatic gain control circuit for NEXT series product

A technology of automatic gain control and series products, applied in the direction of gain control, amplification control, electrical components, etc., can solve the problems of long feedback adjustment period and so on

Inactive Publication Date: 2017-10-20
JIANGXI CRYSTAL BIOSENSOR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the AGC control signal is generated through the steps of A/D conversion and digital processing, the feedback adjustment cycle is very long; if the parameters and performance of the automatic gain control loop are to be improved for the task, then its

Method used

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  • CMOS automatic gain control circuit for NEXT series product
  • CMOS automatic gain control circuit for NEXT series product
  • CMOS automatic gain control circuit for NEXT series product

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Embodiment Construction

[0023]The specific embodiment of the present invention is as follows: a kind of NEXT series product CMOS automatic gain control circuit, each stage of variable gain amplifier is connected with DC offset elimination circuit, fixed gain stage and variable gain amplifier are unidirectionally linked, peak detection The comparator is connected to the output end of the circuit and the fixed gain stage, one end of the comparator is connected to the peak detector and the comparison voltage at the same time, and the other end is connected to the dB linear converter; specifically, the analog AGC loop is selected and the 3dB bandwidth includes 70MHz, because the single The 30dB dynamic range of the VGA is relatively limited, and the gain interval with large gain error and serious distortion must be eliminated. In order to ensure the design margin, a two-stage VGA structure is used. The variable gain amplifier is based on CMOS technology. After each stage, it is connected to a DC Offset el...

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PUM

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Abstract

The invention discloses a NEXT series product CMOS automatic gain control circuit. The automatic gain control circuit is composed of a variable gain amplifier, a fixed gain stage, a peak detector, and a comparator. The variable gain amplifier includes: a VGA main body amplification unit, Common mode negative feedback circuit, DC offset elimination circuit, dB linear converter; variable gain amplifier as the main channel of the intermediate frequency signal, based on CMOS technology, adopts two-stage VGA structure, and connects DC offset elimination circuit after each stage; fixed gain The stage is linked with the variable gain amplifier in one direction, the input transconductance stage adopts a fully differential structure, and the source negative feedback is introduced to provide the absolute value of the gain for the automatic gain control circuit; the peak detector is connected with the output terminal of the circuit and the fixed gain stage, It is used for real-time detection and judgment of signal strength; one end of the comparator is connected to the peak detector and the comparison voltage at the same time, and the other end is connected to the dB linear converter for signal judgment.

Description

technical field [0001] The invention belongs to the specific application in the field of wireless communication circuits, in particular to a CMOS automatic gain control circuit of NEXT series products. Background technique [0002] The development of science and technology is changing with each passing day. In the past ten years, the rapid popularization and upgrading of wireless communication products represented by mobile phones and other wireless device terminals have brought about huge and profound changes in our working methods and lifestyles. Today the wireless communication industry has become one of the largest industries in the world. As the first station of signal receiving and processing, the receiver is responsible for the important tasks of signal extraction, noise reduction, amplification and spectrum shifting. Its performance determines the quality of subsequent signal processing. It is an important application and irreplaceable of analog radio frequency circu...

Claims

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Application Information

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IPC IPC(8): H03G3/30
CPCH03G3/3068
Inventor 徐云鹏
Owner JIANGXI CRYSTAL BIOSENSOR TECH
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