An Efficient Chopper Amplifier, Using a Switched Gm-C Filter Technique

Author

Arnaud, Alfredo

Author_Institution

DIE, Univ. Catolica, Montevideo

fYear

2005

fDate

4-7 Sept. 2005

Firstpage

213

Lastpage

218

Abstract

In this paper, a chopper amplifier built with G_m-C filters that are alternatively turned on and off will be introduced. First, a theoretical framework to estimate the output of a generic switched continuous-time filter in the frequency domain is presented. This study is later employed to determine the behaviour of the chopper amplifier: transfer function, and noise. Final conclusions and preliminary measurements are presented at the end. Due to its simplicity, the circuit is suitable for example in the field of implantable nerve signal amplification, where ultra low noise and minimal power consumption are mandatory

Keywords

CMOS analogue integrated circuits; amplifiers; choppers (circuits); continuous time filters; frequency-domain analysis; low-power electronics; switched capacitor filters; transfer functions; chopper amplifier; circuit noise; continuous time filter; implantable nerve signal amplification; power consumption; switched Gm-C filter; transfer function; ultra low noise; 1f noise; Choppers; Circuit noise; Circuit topology; Energy consumption; Integrated circuit noise; Low pass filters; Noise reduction; Permission; Voltage; Analog design; CMOS; Design; low-power;

fLanguage

English

Publisher

ieee

Conference_Titel

Integrated Circuits and Systems Design, 18th Symposium on

Conference_Location

Florianopolis

Print_ISBN

1-59593-174-0

Type

conf

DOI

10.1109/SBCCI.2005.4286859

Filename

4286859