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Fractional band-gap reference circuit applied to low supply voltage

A low power supply voltage, reference circuit technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc.

Inactive Publication Date: 2018-10-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention solves the problem of providing a reference voltage for a circuit under low power supply voltage, especially in a circuit whose input power supply voltage is lower than 1V

Method used

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  • Fractional band-gap reference circuit applied to low supply voltage
  • Fractional band-gap reference circuit applied to low supply voltage
  • Fractional band-gap reference circuit applied to low supply voltage

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Embodiment Construction

[0010] specific implementation

[0011] In order to make the structural features of the present invention more prominent, combined with the actual circuit structure, specific reasoning results and corresponding explanations are given.

[0012] figure 1 The present invention is a fractional bandgap reference voltage circuit applied to low power supply voltage. Among them, M1, M2, Q1, Q2, and R1 together with the AMP module constitute a PTAT current generation circuit proportional to the absolute temperature. At the same time, point A is also the CTAT voltage point which is inversely proportional to the absolute temperature. M5, M6 (1) to M6 (N-1) are voltage divider circuits. M3, M4, M7, M8 together with R2 constitute the reference voltage output part.

[0013] figure 1 In the PTAT current generating circuit, the area ratio of the emission areas of Q1 and Q2 is selected as 1:n, and the operational amplifier makes the voltages of A and B the same, so that the base-emitter v...

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Abstract

The invention is suitable for the field of integrated circuits, and provides a fractional band-gap reference circuit for low supply voltage on the basis of a BCD technology. The band-gap reference circuit mainly comprises a PTAT and CTAT generation structure, a bad-gap reference output structure, an offset and current source structure and an operational amplifier for clamping. In a branch where band-gap reference output is located, a PTAT current source is sourced into a node 1, a CTAT current sink is sunk on a node 2, the value sizes of the PTAT current source and the CTAT current sink are the same, and a resistor is connected between the node 1 and the node 2 in series. A voltage division circuit exists to conduct voltage division on the CTAT voltage and accesses the node 2, so that thefinally output reference voltage is 1 / N of standard band-gap-based reference voltage (1.205 V under a silicon technology), wherein N is a positive integer. Due to the fact that the band-gap referencecircuit can be used for a circuit with the supply voltage lower than 1 V, the number of transistors connected with each branch in the circuit in series from power voltage to power and the working conditions need to be carefully considered.

Description

technical field [0001] The invention is mainly applied in the field of integrated circuits, and provides reference voltages for circuits, especially application circuits where the reference voltage is lower than the standard bandgap reference voltage. The input supply voltage can be as low as 1V. technical background [0002] The bandgap reference circuit is the most common circuit structure in integrated circuits, and it is about 1.205V for the silicon-based bandgap reference circuit. In this case, the input power supply voltage will be greater than 1.8V. For the application of low power supply voltage, how this circuit structure works normally is a great challenge. [0003] In low-supply-voltage circuits, a reference voltage lower than the bandgap reference voltage would be very practical. It can generate a reference voltage that is 1 / N (where N is a positive integer) of the standard silicon-based bandgap reference voltage. For example, in a circuit with an input power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 冯小龙张国俊
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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