A multi-function biomedical analog front end IC
Date Issued
2009
Date
2009
Author(s)
Huang, Yu-Ting
Abstract
With the advancement and maturation of semiconductor technology, the digital and analog circuit has been integrated on the same chip. In recent years, because of the demand on biomedicine, CMOS bio-sensors have already realized successfully with CMOS technique, achieving miniature, low noise, low power and low cost biomedical systems. In addition, analog front-end circuit with the function of signal arrangement is a critical component in the biomedical system. In this thesis, the main three pieces of circuit are instrumentation amplifier (IA), second-order LPF and a programmable gain amplifier (PGA). They are fabricated in TSMC 0.35μm CMOS 2P4M process.he first stage of the system is based on IA which had accomplished by our laboratory and through the digital control switch and feedback loop to carry out the circuit system with the function of adjusting different intensity signal. Then, using a two-order LPF ( Sallen-key circuit ) to suppress the spikes from the clock feedthrough and charge injection caused by nonideality of the chopper switches. Finally, the signal is further amplified by programmable gain amplifier in the last stage. In order to let the whole system to deal with a wide range of biomedical signals and attain appropriate adjustment according to different kind of small signal sources, the design relies on a switch on/off devise to achieve these multi-functions. The die area is 1.8mm x 1.35mm and the power consumption is 944.2uW from a 3V voltage supply.
Subjects
analog front end IC
Type
thesis
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