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PSR (power supply rejection) reinforcement circuit for low power supply voltage bandgap reference

A technology with low power supply voltage and reference, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of consumption, multi-voltage redundancy, etc., and achieve the effect of increasing power consumption, saving capacitors, and simple structure

Inactive Publication Date: 2013-07-17
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the supply voltage drops to a certain level, this circuit is no longer applicable due to excessive voltage margin consumption

Method used

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  • PSR (power supply rejection) reinforcement circuit for low power supply voltage bandgap reference
  • PSR (power supply rejection) reinforcement circuit for low power supply voltage bandgap reference
  • PSR (power supply rejection) reinforcement circuit for low power supply voltage bandgap reference

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Embodiment Construction

[0024] The working process of the PSR enhancement circuit for low power supply voltage bandgap reference disclosed in the present invention will be described in detail below in conjunction with the accompanying drawings. The detailed description is carried out from two aspects. Firstly, it introduces the connection mode of the PSR enhancement circuit disclosed in the present invention in the bandgap reference, and then introduces figure 2 The working principle of the power supply rejection capability enhancement circuit for low supply voltage bandgap reference disclosed in the present invention is applied as shown.

[0025] figure 2 It is a bandgap voltage reference using the PSR enhancement circuit disclosed by the present invention. The circuit is composed of two parts, namely a typical bandgap reference circuit and a PSR enhancement circuit disclosed by the present invention. The output of the operational amplifier OPA of the typical bandgap reference is connected to th...

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PUM

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Abstract

A reference voltage source is a basic component of an analog / digital analog mixing integrated circuit. Along with the continuous reduction of a chip power supply voltage, the dynamic range of the circuit is reduced, and the power supply rejection of the reference voltage source becomes particularly important. By aiming at the problem, the invention discloses a PSR (power supply rejection) reinforcement circuit for a low power supply voltage bandgap reference voltage source. The power supply rejection of an intermediate frequency range can be evidently reinforced in the case of keeping the power supply rejections of a low frequency range and a high frequency range constant; and additional power consumption is not increased. The PSR reinforcement circuit disclosed by the invention comprisestwo MOS (Metal Oxide Semiconductor) tubes (Mp1 and Mp2) and a capacitor (Cp1); and the circuit can be used in any reference source circuit taking the bandgap reference as a core.

Description

technical field [0001] The invention belongs to the field of integrated circuit design and is used to improve the PSR capability of a bandgap voltage reference voltage source (Bandgap Voltage Reference, BGR), in particular to a negative feedback formed by capacitively coupled power supply fluctuations to significantly enhance the PSR of the bandgap voltage reference Technology. Background technique [0002] In the field of reference voltage sources, BGR has been widely used because of its simple structure, high precision, and good process compatibility. PSR is an important performance index of BGR, which is used to characterize the ability of the circuit to resist power supply interference, especially in the case of low power supply voltage, PSR performance is particularly important. The PSR capability of the circuit is usually measured by the Power Supply Rejection Ratio (PSRR). The PSRR of the BGR is defined as the ratio of the output reference voltage change to the power...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F3/24G05F3/26
Inventor 张炜承陈曾平王卫华杨方杰黄小红
Owner NAT UNIV OF DEFENSE TECH
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