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This paper describes an ultra low-power switched opamp-based integrated ADC designed using a cyclic algorithm approach, for cardiac pacemaker applications. The AID converter shows a typical operating power consumption of 8.18 μW for the analog part and of 9.71 μW for the digital one, whereas the stand by dissipation is about 1 nW and 5 nW, respectively, (measured on 10 chip samples and averaged), considering a typical supply of 2.8 V. The ADC resolution is 10 b, its typical operating clock frequency is 32 kHz (sampling rate is 2.9 kSamples/s) and it is able to reach the same resolution at 2 V, with 0.7 kSamples/s sampling rate, showing a dissipation of 1 μW for the analog part and 1.3 μW for the digital part. Moreover, it is also characterized by low offset and no missing codes.

A Switched Opamp Based 10 Bits Integrated ADC for Ultra Low Power Applications