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Voltage reference source circuit applied to low-power-consumption ultrasonic gas flow meter

A technology of voltage reference source and gas flowmeter, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as poor power supply suppression, high temperature coefficient, and increased linear adjustment rate, and achieve the effect of reducing sensitivity

Inactive Publication Date: 2020-11-27
中筑科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The traditional CMOS voltage reference structure still has the problems of high temperature coefficient, poor power supply rejection or increased linear adjustment rate, which urgently need to be solved

Method used

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  • Voltage reference source circuit applied to low-power-consumption ultrasonic gas flow meter

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Experimental program
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Embodiment 1

[0040] This embodiment provides a voltage reference source circuit applied to a low-power ultrasonic gas flowmeter, including a reference voltage generation module and a current generation module,

[0041] The current generating module is configured to provide a current proportional to the absolute temperature for the reference voltage generating module;

[0042] The reference voltage generation module is configured to generate a reference voltage for use by an external circuit;

[0043] The voltage reference source circuit is configured to generate a reference voltage insensitive to PVT changes through the reference voltage generation module and the current generation module.

[0044] The current generation module in this embodiment includes a start-up circuit, a self-bias generation circuit and a current core circuit;

[0045] The self-bias generation circuit is used to provide a bias voltage for the current core circuit;

[0046] The current core circuit is used to genera...

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Abstract

The invention relates to the technical field of circuit design, and discloses a voltage reference source circuit applied to a low-power-consumption ultrasonic gas flow meter. The voltage reference source circuit comprises a reference voltage generation module and a current generation module, wherein the current generation module is configured to provide a current in direct proportion to absolute temperature for the reference voltage generation module; the reference voltage generation module is configured to generate a reference voltage for an external circuit; and a voltage reference source circuit is configured to generate a reference voltage insensitive to PVT change through the reference voltage generation module and the current generation module. According to the voltage reference source circuit, a temperature coefficient of the reference voltage and the sensitivity of the reference voltage to on-chip resistance and absolute current value process changes are effectively reduced, and the power supply noise of a sub-threshold current is improved.

Description

technical field [0001] The invention relates to the technical field of circuit design, in particular to a voltage reference source circuit applied to a low-power ultrasonic gas flowmeter. Background technique [0002] Voltage references can be found in nearly all advanced electronic products, either stand-alone or integrated into more versatile devices. Example: In a data converter, a reference source provides an absolute voltage that is compared to the input voltage to determine the appropriate digital output. In a voltage regulator, a reference source provides a known voltage value that is compared with the output to obtain a feedback that is used to regulate the output voltage. In voltage detectors, the reference source is used as a threshold to set the trigger point. An ideal voltage reference should have perfect initial accuracy and hold the voltage constant over changes in load current, temperature, and time. In practical applications, designers must make trade-offs...

Claims

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Application Information

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IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 张子豪孙哲政张子谦黄丝美王家燕
Owner 中筑科技股份有限公司