Patent ID: 7626531
Filing Date: 2009-12-01
Classification: H03M

Abstract:
1. A method for converting an analog signal to a digital signal, the method comprising: providing an analog to digital converter including a fine conversion stage and a coarse conversion stage, wherein the fine conversion stage includes a first comparator bank clocked by a first clock and a second comparator bank clocked by a second clock, and wherein the coarse conversion stage provides a coarse output and the fine conversion stage provides a fine output; applying an input voltage and a coarse reference voltage to the coarse conversion stage; applying the input voltage and a first fine reference voltage range to the first comparator bank; applying the input voltage and a second fine reference voltage range to the second comparator bank; based on an output of the coarse conversion stage, selectably asserting the first clock or the second clock; based on the output of the coarse conversion stage, selecting an output of the first comparator bank or an output of the second comparator bank as the fine output; and combining the coarse output and the fine output.