A PMOS-diode Differential Body-driven Offset compensated 0.5V

This paper reports a new 0.5 V supply resolution CMOS comparator suitable for biosensor applications. The comparator uses a body-driven PMOS-diode differential pair and compensates for differential body-input referred offset-voltage through single-ended sampled-data pre-amplification. Extensive simulations were carried out using a 0.13 mum IBM CMOS process technology. The comparator has a differential input overdrive resolution of under 2 mV and a response time of around 0.1 musec which is scalable. The static power dissipation by the comparator from the 0.5 V supply is under 5 muW making it extremely suitable for implantable biosensor devices. In addition, the comparator uses a truly single phase clock (TSPC) for the sampled data operations, thus simplifying dynamic timing requirements.