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Fully-integrated transimpedance amplifier for photoplethysmographic signal processing with two-stage Miller capacitance multiplier

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3 Author(s)
Li, Y. ; Joint Res. Centre for Biomed. Eng., Chinese Univ. of Hong Kong, Hong Kong, China ; Wong, A.K.Y. ; Zhang, Y.-T.

A two-stage Miller capacitance multiplier for compensation is proposed to implement an ultra-low frequency fully-integrated transimpedance amplifier (TIA). With the proposed multiplier, the TIA achieves a passband gain of 89 dB??, a DC current rejection ranging from 0.5 to 85 ??A, and a -3 dB highpass cutoff frequency of 0.5 to 9.5 Hz. This corresponds to an improvement of six times in DC current rejection range compared with previous techniques.

Published in:

Electronics Letters  (Volume:46 ,  Issue: 11 )