Metastability in the comparators of high speed synchronous flashnA-D converters is a source of noise in the output. Pipelining can reducenmetastability errors but can consume significant power in synchronousnsystems, and techniques have been described which aim to reduce thenpower, but can lead to nonlinearity. It is shown that power can also benreduced without loss of linearity by asynchronous micropipeliningntechniques which allow the comparison times to vary without a highnprobability of metastability noise. Other advantages resulting fromnasynchronous internal timing include a reduction in clock noise, andnimproved tolerance to process and interconnect delays
展开▼
