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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

Inactive Publication Date: 2003-01-01
TSINGHUA UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0007] First, the gain is not linear in dB, it is approximate only in a small range;
[0008] Second, the control voltage range is very small, generally only 1V;
[0009] Third, the gain dynamic range is small, and the effective gain dynamic range is only about 10dB;
[0010] Fourth, the dynamic range of the input signal is small;
[0011] Fifth, generally speaking, the maximum gain is relatively small

Method used

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Embodiment Construction

[0025] A kind of variable gain amplifier that the present invention proposes is described in detail as follows in conjunction with accompanying drawing and embodiment:

[0026] Embodiments of the variable gain amplifier circuit structure implemented by the CMOS process proposed by the present invention image 3 shown. The external input signals are differentially input RF signals Vin+ and Vin-, a DC control voltage signal Vcon and a power supply signal Vdd. It includes: three identical cascaded variable gain basic units and two parts of a control voltage generator. The control voltages Vc0, Vc1, Vc2 and Vc3 generated by the control voltage generator are output to the respective variable gain basic units. The specific circuit structure and connection relationship of each part are described in detail as follows:

[0027] The structure of the variable gain basic unit embodiment of the present invention is as follows: Figure 4 As shown, it includes four groups of degenerate M...

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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.

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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Application Information

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IPC IPC(8): H03F3/16
Inventor 李永明郑吉华
Owner TSINGHUA UNIV
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