Variable-gain amplifier

A gain amplifier and variable technology, applied to amplifiers with field effect devices, amplifiers with only semiconductor devices, etc., can solve the problems of small control voltage range, small maximum gain, non-linear relationship, etc., to achieve large dynamic range, The effect of high frequency and low noise
CN1388644AInactive Publication Date: 2003-01-01TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2003-01-01
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The present invention belongs to the field of analog signal treatment and communication technology and relates to variable-gain amplifier. The variable-gain amplifier includes several cascaded basic variable-gain units and one control voltage generator connected to the variable-gain units. The variable-gain amplifier features that basic variable-gain unit comprising several parallelly connected multi-stage stacked resistor-degenerate MOS pairs and two load resistors connected to the degenerate MOS pairs. The present invention may be realized via CMOS technological process and has the advantages of great controlled-voltage range, linear gain, great dynamic range, low working voltage and low power consumption.
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Description

technical field

[0001] The invention belongs to the technical field of analog signal processing and communication, and is particularly suitable for the design of wireless transceivers and audio / video analog signal processing circuits. Background technique

[0002] Variable gain amplifiers are widely used in communication circuits and audio / video analog signal processing circuits. Generally, variable gain amplifiers are required to have a linear relationship between the gain in dB and the control voltage, a large output gain range, a large input dynamic range, low noise, low voltage and low power consumption. The performance of the variable gain amplifier directly affects the performance of the system. However, there are many and high requirements on the indicators and requirements of the variable gain amplifier, which makes it difficult to design a variable gain amplifier with good performance.

[0003] To make the gain range of the variable gain amplifier large, the gener...

Claims

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