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A Self-biased High Power Supply Rejection Ratio Reference Circuit

A high power supply rejection ratio, reference circuit technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of circuit complexity, power consumption increase, etc., to simplify the overall circuit structure and improve PSRR performance Effect

Inactive Publication Date: 2017-03-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of circuit complexity and power consumption increase caused by additional bias circuit and power supply rejection ratio (Power Supply Rejection Ratio, PSRR) enhancement circuit for the existing bandgap reference. A self-biased high power supply rejection ratio reference circuit

Method used

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  • A Self-biased High Power Supply Rejection Ratio Reference Circuit
  • A Self-biased High Power Supply Rejection Ratio Reference Circuit
  • A Self-biased High Power Supply Rejection Ratio Reference Circuit

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Embodiment Construction

[0019] Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail:

[0020] The system topology diagram of the high-precision self-starting power supply circuit proposed by the present invention is as follows figure 2 As shown, it consists of 4 parts, the startup circuit (Start Up Branch), the current amplifier (Current Amplifier), the adjustment op amp (Amplifier) ​​and the bandgap reference core (Bandgap Core); the startup branch generates a bias current during the circuit initialization phase After being amplified by the current amplifier, it provides a bias for the overall core circuit, so that the circuit leaves the zero state, and at the same time exits after the output reference voltage rises to a certain value; the current amplifier amplifies the current of the start-up branch in the start-up phase for the start-up function of the core circuit In the normal working stage, the single-channel current of the operational a...

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Abstract

The invention belongs to the technical field of power supply management, and in particular relates to a self-biased high power supply rejection ratio reference circuit. The bandgap reference circuit of the present invention adopts a fully self-biased structure, based on the bandgap reference core, provides bias for the operational amplifier, and at the same time samples and amplifies its own bias current and re-biases its own power supply, simplifying the overall circuit structure At the same time, the PSRR performance of the output reference voltage is effectively improved through the self-bias and the isolation effect of the current amplifier.

Description

technical field [0001] The invention belongs to the technical field of power supply management, and in particular relates to a self-biased high power supply rejection ratio reference circuit. Background technique [0002] In the field of analog integrated circuit or mixed signal design, the reference voltage source is a very important and commonly used module. It is used in analog and digital converters, power converters, power amplifiers and other circuits. Voltage reference for supply voltage variations. [0003] Traditional reference voltage sources usually rely on bandgap reference circuits, such as figure 1 As shown, it includes an error amplifier A1, a mirror current source composed of PMOS transistors M1, M2, and M3, resistors R1, R2, and PNP transistors T1, T2, and T3. According to the voltage and current characteristics of the bipolar transistor, the reference output voltage V REF [0004] [0005] where V EBQ3 is the voltage difference between the emitter a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 周泽坤李天生曹建文石跃徐俊丁力文张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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