An ultralow-power switched Opamp-based 10-B integrated ADC for implantable biomedical applications

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 [micro]W (stand-by value: 1 nW) for the analog part and of 9.71 [micro]W (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 [micro]W and 1.3 [micro]W for analog and digital part, respectively. Index Terms--Analog-to-digital converter (ADC), biomedical applications, low-power, switched-opamp.