Title :
An Efficient Chopper Amplifier, Using a Switched Gm-C Filter Technique
Author_Institution :
DIE, Univ. Catolica, Montevideo
Abstract :
In this paper, a chopper amplifier built with Gm-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;
Conference_Titel :
Integrated Circuits and Systems Design, 18th Symposium on
Conference_Location :
Florianopolis
Print_ISBN :
1-59593-174-0
DOI :
10.1109/SBCCI.2005.4286859
