A Resistorless Network Programmable Gain Amplifier Circuit

An amplifier circuit and programming gain technology, which is applied in amplifiers, amplifier combinations, differential amplifiers, etc., can solve the problems of large circuit power consumption, large resistor array area, and difficult resistor matching, and achieve the effect of easy implementation and high gain accuracy

Active Publication Date: 2021-11-12
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this structure are: the area of ​​the resistor array is large, the resistance matching is difficult, and the circuit consumes a lot of power, etc.

Method used

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  • A Resistorless Network Programmable Gain Amplifier Circuit
  • A Resistorless Network Programmable Gain Amplifier Circuit
  • A Resistorless Network Programmable Gain Amplifier Circuit

Examples

Experimental program
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Embodiment Construction

[0016] Such as figure 1 As shown, a non-resistor network programmable gain amplifier circuit includes: two-stage digital control gain stages STAGE1 and STAGE2, two-stage common-mode negative feedback circuits CMFB1 and CMFB2, analog control gain stage STAGE3; the input signal is connected to the first stage digital The input terminal of the control gain stage STAGE1, the output terminal of the first digital control gain stage STAGE1 is connected to the input terminal of the second digital control gain stage STAGE2, and the output terminal of the second digital control gain stage STAGE2 is connected to the analog control gain stage STAGE3 The input terminal, the output terminal of the analog control gain stage STAGE3 outputs the final signal; at the same time, the output terminal of the first digital control gain stage STAGE1 is connected to the input terminal of the first common mode negative feedback circuit CMFB1, and the first common mode negative feedback circuit CMFB1 The...

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Abstract

The invention discloses a non-resistance network programmable gain amplifier circuit, comprising: two digital control gain stages STAGE1 and STAGE2, two common mode negative feedback circuits CMFB1 and CMFB2, and an analog control gain stage STAGE3. The beneficial effects of the present invention are: active devices are used in each module of the circuit without any resistors and capacitors, and the layout area is much smaller than that of the traditional structure; The impact of temperature changes and temperature changes on the MOS tube is smaller; benefiting from the fine-tuning function of the analog control gain stage, the present invention can achieve higher gain accuracy, and at the same time flexibly cope with the impact of environmental changes on performance.

Description

technical field [0001] The invention relates to the technical field of general analog circuits, in particular to a non-resistance network programmable gain amplifier circuit. Background technique [0002] Programmable gain amplifiers have a wide range of applications, such as wireless communication receivers with low-IF structures, audio and video mixed-signal integrated circuits, and so on. The programmable gain amplifier is able to adjust its own gain, and transmit the received signal to the subsequent stage circuit with a certain gain. For the subtle input signal, the programmable gain amplifier usually realizes the amplification function to ensure that the subsequent stage circuit receives the signal normally; for the amplitude For larger input signals, the programmable amplifier can also work in negative gain mode to prevent the post-stage circuit from entering nonlinearity. [0003] A common programmable gain amplifier consists of a high-gain operational amplifier and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/34H03F3/45H03F3/68H03G3/30
CPCH03F1/342H03F3/45636H03F3/68H03G3/30
Inventor 樊祥宁陈鑫朱斌超陶健花再军廖一龙王志功
Owner SOUTHEAST UNIV
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