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A Voltage Reference Source with High Power Supply Rejection Ratio and Low Noise

A technology of high power supply rejection ratio and voltage reference source, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as the influence of reference voltage accuracy, and achieve the effect of increasing power supply rejection ratio and improving power supply rejection ratio

Inactive Publication Date: 2015-09-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the power supply in the circuit is directly applied to the transistor that generates the reference, its fluctuation and noise will be directly applied to the output of the reference, which will affect the accuracy of the reference voltage.

Method used

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  • A Voltage Reference Source with High Power Supply Rejection Ratio and Low Noise
  • A Voltage Reference Source with High Power Supply Rejection Ratio and Low Noise
  • A Voltage Reference Source with High Power Supply Rejection Ratio and Low Noise

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Embodiment Construction

[0012] The specific embodiment of the present invention is described below in conjunction with accompanying drawing

[0013] The voltage reference source with high power supply rejection ratio and low noise of the present invention applies the voltage difference (△Vbe) between the emitter and the base generated by two transistors with different emitter areas in the reference voltage generating circuit to the PTAT current generated by the resistor R1 , this current forms the reference voltage through resistors R2 and R3. The op amp OP output terminal V1 in the reference generation circuit is connected to the bias circuit of the cascode current mirror structure, and the positive and negative input terminals of the op amp are respectively connected to the two branches of the triode Q1 and Q2, the current mirror circuit and the reference voltage The generation circuit constitutes a loop, which improves the influence of the fluctuation of the power supply voltage on the output refe...

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Abstract

The invention relates to the technical field of electronic circuits, in particular to voltage reference with high power supply rejection ratio and low noise. The voltage difference (delta Vbe), generated by two triodes with different emitter area in a reference voltage generating circuit, of the emitter and the base is applied to a resistor R1 to generate PTAT current, and the current forms reference voltage through a resistor R2 and a resistor R3. The output end V1 of the operational amplifier OP in the reference voltage generating circuit is connected with the bias circuit of a cascode current mirror structure, the positive-negative input end of the OP is respectively connected to two branches of the triodes Q1 and Q2, a current mirror circuit and the reference voltage generating circuit forms a loop, the power supply rejection ratio of the whole circuit is increased, the fluctuation of the reference voltage is further filtered by a reference voltage output circuit, and the power supply rejection ratio of the circuit is further improved.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to a voltage reference source with high power supply rejection ratio and low noise. Background technique [0002] High-precision voltage reference sources with high power supply rejection ratio and low temperature coefficient are required in analog, digital-analog hybrid, and even pure digital circuits. The performance of the voltage reference source directly determines the quality of the circuit performance to a certain extent. The indicators describing the stability of the voltage reference source mainly include: power supply rejection ratio, temperature coefficient and noise characteristics. In order to meet the requirements of normal operation of the circuit in harsh temperature environment and improve the power utilization efficiency, the voltage reference must have the characteristics of high temperature stability, high power supply rejection ratio and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F3/26
Inventor 罗萍王东俊孙建勇白春蕾廖鹏飞包毅张翔张飞翔
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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