Design of Ultra-Low Power Biopotential Amplifiers for Biosignal Acquisition Applications


Fast development in miniature implantable electronics are expediting advances in neuroscience by allowing observation and management of neural activities. The first stage of an implantable biosignal recording system, a coffee-noise biopotential amplifier (BPA), is critical to the general power and noise performance of the system. In order to integrate a large number of front-end amplifiers in multichannel implantable systems, the facility consumption of every amplifier must be minimized. This paper introduces a closed-loop complementary-input amplifier, that features a bandwidth of 0.05 Hz to ten.5 kHz, an input-referred noise of two.2 $mu$V$_rm rms$, and a power dissipation of twelve $mu$W. As a purpose of comparison, a commonplace telescopic-cascode closed-loop amplifier with a 0.four Hz to eight.five kHz bandwidth, input-referred noise of three.two $mu$V$_rm rms$, and power dissipation of twelve.five $mu$W is presented. Conjointly for comparison, we have a tendency to show results from an open-loop complementary-input amplifier that exhibits an input-referred noise of 3.half-dozen $mu$V$_rm rms$ while consuming 800 nW of power. The two closed-loop amplifiers are fabricated during a 0.thirteen $mu$m CMOS method. The open-loop amplifier is fabricated in a zero.five $mu$m SOI-BiCMOS method. All three amplifiers operate with a one V supply.

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