Title :
An ultralow-power switched opamp-based 10-B integrated ADC for implantable biomedical applications
Author :
Bonfini, G. ; Brogna, A.S. ; Garbossa, C. ; Colombini, L. ; Bacci, M. ; Chicca, S. ; Bigongiari, F. ; Guerrini, N.C. ; Ferri, G.
Author_Institution :
Dipt. di Ingegneria dell´´Informazione, Univ. degli Studi di Pisa, Italy
Abstract :
This paper describes an ultralow-power switched opamp-based integrated analog-to-digital converter (ADC) for cardiac pacemakers applications. The ADC consumption, measured on 10 chip samples and averaged, is 8.18 μW (stand-by value: 1 nW) for the analog part and of 9.71 μW (5 nW) for the digital one, using a supply battery of 2.8 V. The converter has a resolution of 10-b, its typical operating clock frequency is 32 KHz (2.9 KS/s sampling rate) and is able to reach the same resolution at 2 V (0.7 KS/s sampling rate), with a dissipation of 1 μW and 1.3 μW for analog and digital part, respectively.
Keywords :
analogue-digital conversion; low-power electronics; operational amplifiers; pacemakers; signal sampling; switched capacitor networks; 2.8 V; ADC consumption; cardiac pacemakers; implantable biomedical applications; interface electronics; sampling rate; standard battery supply; switched opamp-based integrated ADC; ultralow-power ADC; Analog-digital conversion; Battery charge measurement; Biomedical measurements; Clocks; Digital-to-frequency converters; Frequency conversion; Frequency measurement; Pacemakers; Sampling methods; Semiconductor device measurement;
Journal_Title :
Circuits and Systems I: Regular Papers, IEEE Transactions on
DOI :
10.1109/TCSI.2003.821310
