Journal
MICROELECTRONICS JOURNAL
Volume 74, Issue -, Pages 79-85Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mejo.2018.01.016
Keywords
Analog integrated circuits; Bio-potential amplifier; Instrumentation amplifier; Low power; ECG; IECG; Programmable gain amp
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There is an increasing demand for low power, low voltage, and small size analog readout bio-potential systems. This paper presents an analog front-end for measuring the intra-cardiac signals in implantable and also external ambulatory ECG cardiac recording applications. The analog front-end benefits from voltage to frequency conversion without conventional analog to digital conversion and thereby achieves a very low power consumption. The frequency averaging digital reconstruction makes an intrinsic low pass filter of which the cut-off frequency changes with the averaging interval and eliminates the need for an analog filter in this system. Furthermore, this feature enables the development of a general purpose analog readout bio-potential measurement system with programmable bandwidth. The proposed IC is fabricated in a 0.18 mu m CMOS process and occupies 0.396 mm(2). It can measure intra-cardiac bio-potentials with 9.2-bit resolution while consuming just 0.5 mu A per channel from a 1 V supply. The input referred noise of the intra-cardiac signal readout channel is 2 mu V-rms.
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