A 1.1muW 2.1muVrms Input Noise Chopper Amplifier for Biomedical Applications |
Posted on:2013-09-22 | Degree:Master' | Type:Thesis |
University:University of Washington | Candidate:Mandic, Christopher J | Full Text:PDF |
GTID:2458390008979012 | Subject:Electrical engineering |
Abstract/Summary: | |
Micropower amplifiers for neural sensing and other biosignals are becoming increasingly relevant in cutting edge biomedical research. This thesis presents a complete 1.1uW two stage subthreshold low-noise amplifier configured for measuring local field potentials (brain signals used in neuroprosthetics). The first stage chopper amplifier is a 700nW folded cascode topology with three low-impedance node mixers that allow different sections of the amplifier to be chopped at different frequencies for lower noise levels. With a simulated NEF (noise efficiency factor) of 3.28 the first stage amplifier has the potential for incorporating many recording channels on an implanted IC; making efficient use of both silicon area and battery power. |
Keywords/Search Tags: | Amplifier, Noise |
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