Title:
REFERENCE CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2024/031991
Kind Code:
A1
Abstract:
A reference circuit (10), comprising: a voltage generation module (100) used for generating a reference voltage according to positive and negative temperature coefficient voltages, and regulating the positive and negative temperature coefficient voltages according to a bias voltage; a chopping modulation module (200) connected to positive and negative voltage ends of the voltage generation module (100) and used for performing chopping modulation on the positive and negative temperature coefficient voltages according to a chopping frequency; an amplification and demodulation module (300) connected to two output ends of the chopping modulation module (200) and used for carrying out operational amplification processing on the positive and negative temperature coefficient voltages subjected to the chopping modulation, then performing chopping demodulation according to the chopping frequency and generating a bias voltage, and performing chopping modulation on amplifier noise in the amplification and demodulation module (300) according to the chopping frequency; and a notch filtering module (400) connected to an output end of the amplification and demodulation module (300) and used for performing at a chopping frequency point notch processing on the amplifier noise. The present reference circuit (10) solves the problem of the poor reference noise performance of existing reference circuits.
Inventors:
LI CHEN (CN)
JING ERRONG (CN)
XU DEHUI (CN)
JING ERRONG (CN)
XU DEHUI (CN)
Application Number:
PCT/CN2023/082753
Publication Date:
February 15, 2024
Filing Date:
March 21, 2023
Export Citation:
Assignee:
SHANGHAI SUNSHINE TECH CO LTD (CN)
International Classes:
G05F1/567
Foreign References:
| CN115237194A | 2022-10-25 | |||
| CN217821383U | 2022-11-15 | |||
| CN103488232A | 2014-01-01 | |||
| CN110247654A | 2019-09-17 | |||
| CN111628735A | 2020-09-04 | |||
| CN104601127A | 2015-05-06 | |||
| CN109818583A | 2019-05-28 | |||
| JP2018061143A | 2018-04-12 | |||
| US20150229278A1 | 2015-08-13 |
Attorney, Agent or Firm:
SHANGHAI ZHONGXIANG HEYI INTELLECTUAL PROPERTY AGENCY CO., LTD (CN)
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