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Variable gain amplifier

A gain amplifier and variable technology, applied in the direction of gain control, amplification control, electrical components, etc., can solve the problems of reducing the integration level and the large number of resistors, and achieve good linearity, high integration level, and simple circuit structure Effect

Inactive Publication Date: 2015-06-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the number of resistors is an integer, the change of the realized gain is stepwise, not continuous, and the number of resistors required for variable gain to achieve a certain accuracy is relatively large, which reduces the integration of CMOS

Method used

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Embodiment Construction

[0024] specific implementation plan

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

[0026] The variable gain amplifier of the present invention is composed of a folded cascode structure, a gain adjustment unit, a current mirror, a load resistor, a current source and a control voltage conversion circuit, as shown in the attached figure 1 shown. Its specific circuit structure is as follows:

[0027] The sources of the first NMOS transistor (M1) and the second NMOS transistor (M2) are respectively coupled to the ground voltage, the drain of (M1) is coupled to the first node, and the drain of (M2) is coupled to the second node, The gate terminals are respectively used as signal positive and negative input terminals (Vinp, Vinn) to form a common source input pair tube of a folded cascode structure;

[0028] The third NMOS transistor (M3) and the fourth NM...

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Abstract

The invention belongs to the technical field of analog signal processing and communication, and relates to a variable gain amplifier which comprises a folding common-source common-gate structure, a gain adjustment unit, a current mirror, a load resistor, a current source and a control voltage conversion circuit. A circuit consists of MOS (metal oxide semiconductor) transistors, the current mirror and a small number of resistors R. The control voltage conversion circuit can generate different control voltages (Vctr) in the gain adjustment unit under the action of the same input control circuit (VCTR) so that continuous dB (decibel) linear variable gain can be realized. The circuit structure is suitable for CMOS (complementary metal oxide semiconductor) technology, the variable gain amplifier is high in integration degree, and continuous dB linearity is high by means of the MOS transistors in multi-group parallel connection.

Description

technical field [0001] The invention relates to a variable gain amplifier, which belongs to the technical field of analog signal processing and communication. Background technique [0002] In the digital-analog hybrid integrated circuit system, the input signal needs to be amplified and attenuated when processing the analog signal, and the variable gain amplifier is an important module to realize this function. The gain of the variable gain amplifier can change with the control signal, and it is widely used in disk reading drive circuits, disk data storage systems, TV tuners, electromagnetic meters, high-frequency filters, medical electronic equipment, etc., in wireless communication and transceiver system also plays an important role. [0003] CMOS circuits have the characteristics of low power consumption, low cost, and easy integration with digital circuits. With the continuous development of CMOS technology and the market's demand for low-cost, high-performance, highly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03G3/20
Inventor 吴霜毅王成碧宁宁赵思源陈荣冠胡勇李天柱眭志凌
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA