A 60-MHz 150-μV Fully-Differential Comparator
نویسندگان
چکیده
The overall performance of two-step flash A/D converters hinges on the second-stage fine comparator. This paper descibes the design of a 60 MHz fully differential comparator, intended for use in a 12-bit two-step flash converter. The comparator consists of four pre-amplifier stages followed by a regenerative latch. It uses a combination of output offset cancelation and input offset cancelation to acheive 150 mV resolution. The comparator is designed to operate from a 2.5V supply, has an active area of 522 μm, and consumes 247 μW of power.
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