Flicker Noise Analysis on Chopper Amplifier

被引：1
作者：
Zhou, Ting
Gao, Zhuo
Huang, Jiajie
Lu, Yewangqing
Chen, Mingyi
Li, Yongfu [1 ]
机构：
[1] Shanghai Jiao Tong Univ, Dept Micronano Elect, Shanghai, Peoples R China
来源：
2021 19TH IEEE INTERNATIONAL NEW CIRCUITS AND SYSTEMS CONFERENCE (NEWCAS) | 2021年
关键词：
Flicker Noise; Chopping Technique; Signal Modulation; Charge Injection; Clock Feed-through; Bootstrapped Switch;
D O I：
10.1109/NEWCAS50681.2021.9462742
中图分类号：
TP3 [计算技术、计算机技术];
学科分类号：
0812 ;
摘要：
This paper aims to maximize the performance of the chopper amplifier, considering the design trade-off between noise and power consumption. To achieve the goal, we identify and model the various sources of flicker noise in the amplifier and switches using Verilog-AMS language. Then, we build a chopper amplifier circuit and investigate the influences of chopping frequency, the type of switches (N-type switch, N-type switch with dummy, transmission gate, and bootstrapped N-type switch) and its non-idealities on its noise performance. Based on our analytical study with simulation results using the circuit model, we can identify the optimal chopping frequency and use N-type switches to minimize mismatch in parasitic capacitance. Therefore, we can reduce the total input-referred-noise by 4.9x compared with an amplifier without using the chopping technique.
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页数：4
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