High-performance CMOS current comparator

A new high-performance CMOS current comparator is proposed. By adding two inverters in the feedback loop of Traff´s comparator, the proposed comparator exhibits significant speed improvement especially for low input currents. Simulated in a 0.18 mum CMOS technology, the comparator achieves a 0.6 ns delay for a 100 nA input current at 1.8 V supply, which is about eight times faster than Traff´s comparator.