A Swap-Combine Offset & Flicker Noise Cancellation Technique for Discrete Time Amplifier

The discrete-time amplifier has the property of sample and hold, thus it is difficult to adopt local feedback method to deal with offset and flicker noise. A calibration-free swap-combine noise cancellation technique is proposed to remove the input-pair-introduced mismatch in discrete-time amplifier...

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Bibliographic Details
Published in2020 IEEE International Symposium on Circuits and Systems (ISCAS) pp. 1 - 5
Main Authors Li, Xuan, Ma, Rui, Wei, Jingwei, Li, Dongmei, Li, Guolin, Wang, Zhihua
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.10.2020
Subjects
1f noise
Calibration
Calibration-free
Capacitors
Delays
Detectors
Discrete Time Analog
Dynamic Amplifier
Flicker Noise
Mismatch
Noise Filtering
Offset
Prototypes
PVT
Robustness
Self-timed Logic
Transistors
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Summary:The discrete-time amplifier has the property of sample and hold, thus it is difficult to adopt local feedback method to deal with offset and flicker noise. A calibration-free swap-combine noise cancellation technique is proposed to remove the input-pair-introduced mismatch in discrete-time amplifiers with keeping the same external interface so it can directly replace the original amplifier. The proposed method can eliminate the flicker noise by modifying the noise transfer function, as well as achieve significant offset suppression. Simulation of a prototype shows that it can reduce the offset root mean square from 10mV to 0.25mV. Benefiting from avoiding calibration loops, the proposed method can also deal with input common-mode voltage variation and temperature drift, as well as reducing the calibration area cost and initial delay.
ISBN:9781728133201
1728133203
ISSN:2158-1525
2158-1525
DOI:10.1109/ISCAS45731.2020.9181171