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A CMOS Voltage Reference Source Without Resistor

A voltage reference source, no resistance technology, applied in the power supply field, can solve the problems of poor power supply suppression and large temperature coefficient, and achieve the effect of improving PSRR, low temperature coefficient, and good power supply rejection ratio

Inactive Publication Date: 2011-12-14
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing non-resistive bandgap reference source has a large temperature coefficient and relatively poor power supply rejection, and proposes a non-resistive CMOS voltage reference source

Method used

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  • A CMOS Voltage Reference Source Without Resistor
  • A CMOS Voltage Reference Source Without Resistor
  • A CMOS Voltage Reference Source Without Resistor

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Embodiment Construction

[0015] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0016] The structure schematic diagram of the non-resistor CMOS voltage reference source of the present invention is as figure 1 As shown, it includes: start-up circuit, bias circuit, non-resistor PTAT voltage generation circuit, CTAT voltage generation circuit and superimposed output voltage circuit. The start-up circuit provides a start-up bias voltage for the whole circuit, and when the whole circuit works stably, the start-up circuit stops working and is isolated from the whole circuit; the bias circuit provides current bias for the whole circuit, wherein the current mirror adopts a cascode structure, It is helpful to improve the PSRR of the voltage reference; the non-resistor PTAT voltage generation circuit generates a first-order positive temperature compensation voltage, and its temperature characteristic curve is a straight line; the C...

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Abstract

The invention discloses a nonresistance CMOS (Complementary Metal-Oxide-Semiconductor Transistor) voltage reference source, which comprises a start-up circuit, a bias circuit, a nonresistance PTAT voltage generating circuit, a CTAT voltage generating circuit, and a stacking output voltage circuit. The voltage reference source provided by the invention calculates the sum of first order positive temperature compensation voltage and first order negative temperature compensation voltage generated by the nonresistance PTAT voltage generating circuit and the CTAT voltage generating circuit, and outputs compensated zero temperature voltage, which has favorable temperature stability and higher power rejection ratio. The voltage reference source provided by the invention can be applied in various kinds of analog and digital-analog mixed integral circuit, such as various kinds of oscillators, phase-locked loops, data converters, etc.

Description

technical field [0001] The invention belongs to the technical field of power supplies, and in particular relates to the design of a voltage reference source (Voltage Reference). Background technique [0002] High-precision voltage reference sources are required in analog, digital-analog hybrid, and even pure digital circuits, such as oscillators, phase-locked loops, data converters, and flash memory control circuits. The stability of the voltage reference directly determines the quality of the circuit performance. The indicators describing the stability of the voltage reference source mainly include: power supply rejection ratio and temperature coefficient. In order to meet the requirements of the circuit to work normally under harsh external temperature environment, the voltage reference must have a very small temperature coefficient, that is, very high temperature stability. [0003] Traditional bandgap references work by utilizing a thermal voltage V with a positive tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F3/24
Inventor 周泽坤朱培生王慧芳石跃明鑫张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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