PROVIDING REFERENCE VOLTAGE WITH DESIRED ACCURACY IN SHORT DURATION TO DYNAMICALLY VARYING LOAD

摘要

Simplifying the design of buffer amplifier circuits to provide reference voltages of desired characteristics on a path. Two separate circuits (520, 540) may be used to provide the necessary charging (of a load connected to the path) in non-overlapping time durations. In an embodiment in which the load comprises sampling capacitors of a stage of an analog-to-digital converter (ADC), each of the two circuits contains a corresponding charging capacitor, with the charging capacitors charging the load in non-overlapping time durations of a hold phase. The first charging capacitor may be charged using a coarse buffer with a high drive strength and the second charging capacitor may be charged using a fine buffer with high accuracy.