Patent ID: 6646585
Filing Date: 2003-11-11
Classification: H03M

Abstract:
An analog-to digital converter comprising:first and second input terminals for receiving a differential analog input signal; an impedance network comprising a plurality of resistors coupled in series and defining M reference nodes between the first and second input terminals; a current source coupled to each one of the reference nodes, each one of the current sources for drawing a current from a corresponding one of the reference nodes to provide a plurality of reference signals at the reference nodes having a parabolic profile overall; a first plurality of comparators coupled to the impedance network for comparing signals between reference nodes separated from each other by n1 nodes and for providing digital signal outputs therefrom; a second plurality of comparators coupled to the impedance network for comparing signals between reference nodes separated from each other by n2 nodes and for providing digital signal outputs therefrom, n2 being an integer not equal to n1; wherein 11&lE;M/2.