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Lower-power-consumption reference source circuit

A reference source circuit, low power consumption technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve problems such as the circuit power supply rejection ratio is not ideal, the reference output voltage noise interference, and the circuit self-protection cannot be realized. Achieve the effect of low power consumption, low output voltage and simple structure

Active Publication Date: 2014-01-15
SUN YAT SEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Again, the start-up speed of this circuit is slow, and the reference voltage of the bandgap reference voltage source will not be turned off even when it is too high, and the self-protection of the circuit cannot be realized.
Moreover, the power supply rejection ratio of the circuit is usually not ideal, especially in the environment where the power supply noise is relatively harsh, the reference output voltage will be greatly disturbed by noise

Method used

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0032] The present invention utilizes the operating characteristics of CMOS transistors in the sub-threshold region to design a reference source circuit with low power consumption, low temperature coefficient and small area. By using CMOS with different gate thresholds to realize stable voltage output, stable voltage output with low temperature coefficient is realized. The voltage and current characteristics of a CMOS transistor operating in the subthreshold region are shown in the following expression:

[0033] (2)

[0034] in V TH is the gate threshold voltage with a positive temperature coefficient and V T is the thermal voltage ( V T =k B T / q ) has a negative temperature coefficient. K is the width-to-length ratio of the CMOS tube, I D is its drain current, u is the c...

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Abstract

The invention discloses a lower-power-consumption reference source circuit. The lower-power-consumption reference source circuit comprises a starting circuit unit, a current generation circuit unit and an output load circuit unit, wherein the starting circuit unit, the current generation circuit unit and the output load circuit unit are connected in sequence, the starting circuit unit is used for providing starting voltage, and preventing operation in a zero state area, the current generation circuit unit is used for generating microcurrent for the output load circuit unit, and reducing power consumption of the lower-power-consumption reference source circuit, and the output load circuit unit is used for achieving output of a zero-temperature coefficient and low-output voltage. The lower-power-consumption reference source circuit has the advantages of being low in power consumption, low in temperature coefficient, large in range of operating voltage and small in area.

Description

technical field [0001] The invention relates to a reference source circuit with low power consumption, low temperature coefficient, wide working range and small area, more specifically, a reference source circuit with low power consumption. Background technique [0002] Reference source circuit modules are widely used in analog and mixed circuits, such as A / D, D / A converters, voltage tuners, voltmeters, ammeter test instruments and bias circuits. The output reference signal is stable and has nothing to do with power supply voltage, temperature and process changes. In the SOC (system on chip) chip, the reference source circuit is an indispensable part. Many modules of the chip need a reference source to provide stable voltage or current, so the design of the reference source becomes the key to the entire chip design. [0003] The following performance indicators are mainly considered in the design of the reference source circuit: temperature coefficient, operating voltage ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 谭洪舟曾衍瀚黄毅荣许远坤曾淼旺李毓鳌
Owner SUN YAT SEN UNIV
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