Measurement and analysis of input current noise in chopper amplifiers

Author

Xu, Jiawei ; Fan, Qinwen ; Huijsing, Johan H. ; Van Hoof, Chris ; Yazicioglu, Refet Firat ; Makinwa, Kofi A A

Author_Institution

imec - Holst Centre, Eindhoven, Netherlands

fYear

2012

fDate

17-21 Sept. 2012

Firstpage

81

Lastpage

84

Abstract

This paper explains how the charge injection and clock feed-through of MOSFET switches causes significant input currents and current noise in chopper amplifiers. The current noise can be modeled as a form of shot noise with a white power spectral density (PSD). Both the input current and its noise PSD increase linearly with the chopping frequency. This has been verified by measurements on identical chopper amplifiers with different types of input choppers. Some design guidelines are proposed, as well as a low-noise input chopper based on a reduced-swing (V_dd/2) bootstrapped clock driver.

Keywords

MOSFET; amplifiers; charge injection; choppers (circuits); electron device noise; MOSFET switches; charge injection; chopper amplifiers; chopping frequency; clock feed-through; design guidelines; input current noise; input currents; low-noise input chopper; noise PSD; power spectral density; reduced-swing bootstrapped clock driver; Choppers (circuits); Clocks; Current measurement; MOS devices; Noise; Noise measurement; Voltage measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

ESSCIRC (ESSCIRC), 2012 Proceedings of the

Conference_Location

Bordeaux

ISSN

1930-8833

Print_ISBN

978-1-4673-2212-6

Electronic_ISBN

1930-8833

Type

conf

DOI

10.1109/ESSCIRC.2012.6341261

Filename

6341261