Circuit for low-offset operational amplifier

A technology of operational amplifiers and circuits, which is applied in the direction of improving amplifiers to reduce temperature/power supply voltage changes, etc. It can solve the problems of large input current and high precision, so as to reduce input current, improve work stability, and realize high-precision signals. Effect

Active Publication Date: 2016-08-24
西安航天民芯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the input current of the traditional bipolar operational amplifier is relatively large, so it cannot meet the requirements of high precision

Method used

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  • Circuit for low-offset operational amplifier
  • Circuit for low-offset operational amplifier

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Embodiment 1

[0023] In embodiment 1, the input current compensation unit is connected to NPN2 and NPN3 of the input amplifier stage unit respectively through MP3 and MP4, and is used to compensate the input current introduced due to the use of bipolar input pair tubes;

[0024] The input amplifier stage unit is respectively connected to NPN4 and NPN5 of the output stage unit through MP5, MP6, MN5, and MN6, and is used to amplify the tiny input differential signal to obtain an output value.

[0025] The output stage unit is connected to the power supply potential through the collector of NPN4, the emitter of NPN4 is connected to the positive output terminal Vop of the input amplifier circuit, the emitter of NPN4 is connected to the collector of NPN5, and is used as the output terminal Vout of the operational amplifier, and the output terminal of NPN5 The base is connected to the reverse output terminal Von of the input amplifier circuit, and the emitter of the NPN5 is connected to the ground...

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Abstract

The present invention discloses a circuit for a low-offset operational amplifier, and is applied to the low-offset operational amplifier, so as to enable the low-offset operational amplifier to have a relatively low input current. The circuit includes an input current compensation circuit, an input amplification stage circuit, an output stage circuit, and a phase compensation circuit. The input current compensation circuit is used for compensating an input current introduced due to adoption of bipolar input geminate transistors, so as to reduce input offset of the operational amplifier. The input amplification stage circuit adopts a folded cascode structure, and uses bipolar devices as input geminate transistors to amplify a micro input differential signal, so as to obtain an output value. The output stage circuit is used for providing large current carrying capacity, so as to ensure the operational amplifier to drive a post-stage circuit normally. The phase compensation circuit is used for compensating a phase margin of the operational amplifier, so as to ensure the operational amplifier to work stably in a specified usage mode.

Description

technical field [0001] The invention relates to a low offset operational amplifier circuit, in particular to a low offset operational amplifier circuit which can effectively reduce input current. Background technique [0002] Operational amplifiers are increasingly used in communication systems, optical systems, sensor systems, and instrumentation. However, with the advancement of science and technology, the requirements for signal accuracy are getting higher and higher, and to realize high-precision signals, operational amplifiers with lower offset voltage and lower offset current are required. Bipolar operational amplifiers have the characteristics of strong drive capability, fast speed, and low noise, and have a wide range of applications. However, the input current of traditional bipolar operational amplifier is relatively large, so it cannot meet the requirements of high precision. Therefore, there is a need for an operational amplifier circuit capable of reducing the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/30
CPCH03F1/30
Inventor 王振孙权
Owner 西安航天民芯科技有限公司
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