ADC WITH NOISE-SHAPING SAR

摘要

Representative implementations of devices and techniques provide analog to digital conversion of analog inputs. A multistage comparator using a feed-forward technique can provide noise shaping of conversion errors. For example, the comparator may feed a conversion error forward from a first stage to a next stage of the multistage comparator.

主权项

1. An apparatus, comprising:
a first stage arranged to receive an analog input and to perform a first conversion based on the analog input; a delay component arranged to receive and delay a conversion error of the first conversion, based on a predetermined delay; a combiner arranged to receive an output of the first stage and to combine the output with the error to form an input of a next stage; and a next stage arranged to receive the output of the first stage combined with the error, and to perform a conversion based on the output of the first stage and the error, an output of the next stage resulting in a digital approximation of the analog input.