摘要： This paper describes a bioamplifier that employs a voltage-controlled-pseudo-resistor to achieve tunable bandwidth and wide operating voltage range for biomedical applications. The versatile pseudo-resistor employed provides ultra-high resistance for ac coupling to cancel the dc offset from electrode–tissue interface. The voltage-controlled-pseudo-resistor consists of serial-connected PMOS transistors working at the subthreshold region and an auto-tuning circuit that makes sure the constant (time-invariant) control-voltage of the pseudo-resistor. This bandwidth-tunable bioamplifier is designed in a 0.18-μm standard CMOS process, achieving a gain of 40.2dB with 10.35-μW power consumption. The designed chip was also used to develop the proof-of-concept prototype. An operation bandwidth of 9.5kHz, input-referred noise of 5.2 μVrms from 6.3Hz to 9.5kHz and 5.54 μVrms from 250Hz to 9.5kHz, and a tunable cutoff-frequency from 6.3–600Hz were demonstrated to prove our design. 出版者： Elsevier Ltd 出版日期： 2015-06-01 出處： Microelectronics, 2015-06, Vol.46 (6), p.472-481 版權： 2015 Elsevier Ltd 識別號： ISSN: 1879-2391 識別號： DOI: 10.1016/j.mejo.2015.03.013
