CMOS Low-power and Low-noise Readout Circuits for Biomedical Applications
Date Issued
2009
Date
2009
Author(s)
Chou, Chien-Jung
Abstract
With the population ageing, there is a growing demand for the low-power, small-size and ambulatory biomeical monitoring system. A crucial block in the biomedical system is the analog readout front-end. The thesis focuses on the design of low-power and low-noise readout circuitrs for the biomedical application. The other focus of the thesis is the design of variable gain amplifier (VGA) for the modern communuication systems. The biomedical readout circuits are based on current-mode instrumentation amplifier (CMIA) topology to implemene the amplifiers. To remove the DC offset of CMIA, an active-RC integrator with the subthreshold-biased pMOS as high reisitance is used. A programmable gain amplifier (PGA) is adopted to set the overall gain to support various biomedical signals. Besides, the nested-chopper technique is used to reduce the flicker noise and increases common-mode rejection ratio (CMRR). Finally, a 3th –order elliptic Gm-C low-pass filter removes the high-frequency noise modulated by the input chopper. The readout circuits are fabricated in 0.18-
Subjects
readout front-end
instrumentation amplifier
chopper
variable gain amplifier
pseudo-exponential function generator
Type
thesis
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ntu-98-R94942130-1.pdf
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