Research PaperNo Access

A 4.21- $μ$ $μ$ V Offset Voltage and 42-nV $/ \sqrt$ $/ \sqrt$ Hz Input Noise Chopper Operational Amplifier with Dynamic Element Matching

Ruikai Zhu

School of Electronic Information, Soochow University, Shizi Street NO.1, Suzhou, Jiangsu Province, 215031, P. R. China

E-mail Address: 20214228013@stu.suda.edu.cn

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Chenjian Wu

School of Electronic Information, Soochow University, Shizi Street NO.1, Suzhou, Jiangsu Province, 215031, P. R. China

E-mail Address: cjwu@suda.edu.cn

Corresponding author.

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https://doi.org/10.1142/S0218126623502845Cited by:2 (Source: Crossref)

Abstract

This paper presents a high-efficiency operational amplifier (op-amp) used in the readout circuit of micro-sensor. The chopping and dynamic element matching (DEM) techniques are used in the proposed design, which greatly reduce the offset voltage and flicker noise $(1 / f$ $(1 / f$ noise) of the op-amp. By optimizing the circuit structure, the maximum chopping frequency is increased to 2MHz when the offset voltage is less than $20 μ$ $20 μ$ V. Therefore, the maximum bandwidth of signal processing can be up to 1MHz. The proposed circuit is designed and fabricated using TSMC 0.18- $μ$ $μ$ m 1P5M CMOS technology. It occupies an area of 0.16mm² and consumes $75 μ$ $75 μ$ A from a 1.8-V supply. When the chopping frequency is 100kHz, the input-referred offset voltage is 4.21 $μ$ $μ$ V and the input-referred noise is 42nV $/ \sqrt$ $/ \sqrt$ Hz. It achieves a noise efficiency factor of 7.82 and a power efficiency factor of 110.07.

This paper was recommended by Regional Editor Giuseppe Ferri.

Keywords:

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Vol. 32, No. 17

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History

Received 4 December 2022

Revised 19 March 2023

Accepted 1 April 2023

Published: 23 May 2023

Keywords

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System Upgrade on Tue, May 28th, 2024 at 2am (EDT)

A 4.21- $μ$ $μ$ V Offset Voltage and 42-nV $/ \sqrt$ $/ \sqrt$ Hz Input Noise Chopper Operational Amplifier with Dynamic Element Matching

Abstract

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