Patent ID: 7773020
Filing Date: 2010-08-10
Classification: H03M

Abstract:
1. A successive approximation analog to digital converter comprising first and second digital to analog converters, at least three comparators and a capacitive summing network for simultaneously forming at least first to third combinations of outputs from the first and second digital to analog converters such that at least three decision thresholds can be tested at the same time, and wherein the summing network comprises capacitors connected in series between an output of each digital to analog converter and a respective summing node, the second digital to analog converter is a dual ended device having first and second complementary outputs, and one of the first and second complementary outputs is connected to the respective summing node by a first capacitor and the other of the first and second complementary outputs or the same one of the first and second complementary outputs is connected to the respective summing node by a second capacitor.