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Constant gain operational amplifier

A gain operation and amplifier technology, applied in the electronic field, can solve problems such as inability to achieve constant gain, and achieve the effect of amplitude reduction

Inactive Publication Date: 2016-05-11
胡峻源
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The operational amplifier in differential form is the basic structure in the field of integrated circuit design. The gain of the operational amplifier fluctuates with the change of the input differential voltage value, and it cannot achieve a constant gain within a certain voltage range.

Method used

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  • Constant gain operational amplifier

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Embodiment Construction

[0016] The specific embodiment of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0017] The constant gain operational amplifier of the present invention is based on a CMOS process, and includes an input stage pair of tubes and a load, and is characterized in that: the non-common ends of the input stage pair of tubes are also connected with a resistance R that meets GM*R>A Resistive device, where GM is the transconductance of the input stage to the tube, and A is a preset discrete parameter.

[0018] Such as figure 1 A specific embodiment of the present invention is shown, the first input terminal 1 and the second input terminal 2 are respectively connected to the grid of the input pair tube, the first bias terminal 3 is connected to the grid of the bias P tube, and the second bias terminal 4 Connect the load N tube gate stage, and connect a resistor device 5 between the drains of the input pair of tubes. Since ...

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Abstract

The invention discloses a constant gain operational amplifier. The constant gain operational amplifier comprises input stage geminate transistors and a load. The constant gain operational amplifier is characterized in that a resistance device of which a resistance value satisfies a condition that GM*R is greater than A is further connected between non-public ends of the input stage geminate transistors, wherein GM is trans-conductance of the input stage geminate transistors; and A is a preset discrete parameter. The constant gain operational amplifier is used by the resistance device for shunting current flowing through two differential branches in order that drain voltages at input stages are approximated, so that the trans-conductance of the input stage geminate transistors is balanced, and a varying amplitude of a gain of the operational amplifier along with input differential voltages is lowered greatly.

Description

technical field [0001] The invention belongs to the field of electronics and relates to a constant gain operational amplifier. Background technique [0002] CMOS (ComplementaryMetalOxideSemiconductor), complementary metal oxide semiconductor, a voltage-controlled amplification device. It is the basic unit of CMOS digital integrated circuits. [0003] An operational amplifier ("op amp" for short) is a circuit unit with a very high amplification factor. In actual circuits, some kind of functional module is usually combined with a feedback network. Because it was used in analog computers in the early days to realize mathematical operations, it was named "operational amplifier". An operational amplifier is a circuit unit named from a functional point of view, which can be realized by a discrete device or in a semiconductor chip. With the development of semiconductor technology, most operational amplifiers exist in the form of a single chip. There are many types of operation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45H03F1/30
Inventor 胡峻源
Owner 胡峻源