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Zero temperature coefficient reference voltage and current source generating circuit

A technology with zero temperature coefficient and reference voltage, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of large consumption area and increase the overall circuit cost, and achieve the reduction of consumption area, cost reduction, and circuit structure simple effect

Active Publication Date: 2021-02-26
3PEAK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The current zero temperature coefficient reference voltage and current source generation circuit in the prior art includes two operational amplifiers, which will occupy a large area of ​​consumption and increase the cost of the overall circuit

Method used

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  • Zero temperature coefficient reference voltage and current source generating circuit
  • Zero temperature coefficient reference voltage and current source generating circuit

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Embodiment Construction

[0037] The present invention will be described in detail below in conjunction with various embodiments shown in the drawings. However, these embodiments do not limit the present invention, and structural, method, or functional changes made by those skilled in the art according to these embodiments are included in the protection scope of the present invention.

[0038] And, it should be understood that although the terms first, second, etc. may be used herein to describe various elements or structures, these described objects should not be limited by these terms. These terms are only used to distinguish these described objects from one another. For example, a first current replication unit may be called a second current replication unit, and similarly, a second current replication unit may also be called a first current replication unit, which does not depart from the protection scope of the present application.

[0039] The invention discloses a zero temperature coefficient r...

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PUM

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Abstract

The invention discloses a zero-temperature-coefficient reference voltage and current source generation circuit, and the circuit comprises a reference voltage generation unit which is used for generating a zero-temperature-coefficient reference voltage VBG and comprises an operational amplifier, an MOS tube M1, a plurality of NPN transistors, and a resistor; a current source generation unit which is used for generating a zero-temperature-coefficient current source IZTC and comprises a plurality of resistor units which are connected with the MOS tube M1 and are arranged in series; a first current copying unit which is used for copying the current in the MOS tube M1; a second current copying unit which is connected with the first current copying unit and is used for copying the current in a first branch circuit and a second branch circuit; and a current source output unit which is connected with the second current replication unit in parallel, is connected with the first current replication unit and is used for outputting the zero-temperature-coefficient current IZTC. The circuit only needs one operational amplifier to generate the zero-temperature-coefficient reference voltage and the current source, the circuit structure is simple, the consumption area is reduced, and the cost of the whole circuit is reduced.

Description

technical field [0001] The invention belongs to the technical field of circuit design, and in particular relates to a zero temperature coefficient reference voltage and current source generating circuit. Background technique [0002] In analog circuit applications, a stable reference voltage that is not affected by power supply voltage and temperature changes is often required to improve the yield, reliability and accuracy of the overall circuit. This circuit is called "Bandgap Reference Circuit (BandgapReference Circuit)", It provides a reference voltage to monitor the operation correctness of power supply or other circuits, etc. It is an extremely widely used and important circuit. In addition, the bandgap reference voltage circuit based on zero temperature coefficient can further provide a current source with zero temperature coefficient. [0003] The zero temperature coefficient reference voltage and current source generation circuit parameters in the prior art figure ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 李海波王永攀
Owner 3PEAK INC
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