US Patent No. 10,483,996

TIME SKEW CALIBRATION OF TIME-INTERLEAVED ANALOG TO DIGITAL CONVERTERS


Patent No. 10,483,996
Issue Date November 19, 2019
Title Time Skew Calibration Of Time-interleaved Analog To Digital Converters
Inventorship Christophe Erdmann, Dublin (IE)
Bob W. Verbruggen, Dublin (IE)
Ali Boumaalif, Cork City Centre (IE)
Bruno Miguel Vaz, Sao Domingos de Rana (PT)
Assignee XILINX, INC., San Jose, CA (US)

Claim of US Patent No. 10,483,996

1. A clock skew calibration apparatus comprising:an array of N time-interleaved analog-to-digital converters (TIADCs) receiving an analog input signal and configured to generate a stream of originating samples in a digital format, wherein the stream rate of the generated stream is one sample per period of an overall sampling clock (sclk) having a sampling frequency fS, and wherein the TIADCs are configured to receive an array of sampling clocks each having an individual sampling frequency of substantially fS/N; and,
a time skew extractor circuit comprising:
a summer circuit operatively coupled to receive the generated sample stream and a stream of delayed samples of the generated sample stream, wherein the summer circuit is configured to sum two consecutive samples from the generated sample stream; and,
a first absolute value circuit operatively coupled to the summer circuit, wherein the first absolute value circuit is operatively coupled to produce an array of clock error signals as a function of the summed consecutive samples of the generated sample stream.