Method and device for compensating bandwidth mismatches of time interleaved analog to digital converters

摘要

A device can be used for compensating bandwidth mismatches of time interleaved analog to digital converters. A processor of the device determines, for each original sample stream, an estimated difference between the time constant of a low pass filter representative of the corresponding converter and a reference time constant of a reference low pass filter, and uses this estimated difference and a filtered stream to correct the original stream and deliver a corrected stream of corrected samples.

主权项

1. A method of direct compensation of bandwidth mismatch, the method comprising:
receiving M original trains of M original samples from of M time-interleaved converters, M being greater than two, each converter being considered in the first order as comprising a first order low-pass filter; digitally filtering the M original trains delivering M corresponding filtered trains of filtered samples, the filtering having a transfer function substantially equal to the product of a transfer function of a reference low-pass filter and a transfer function of a derivative filter multiplied by a reference time constant of the reference low-pass filter; and for each original train of original samples,
performing an estimation process to deliver an estimated difference between the time constant of the first order low-pass filter associated with the corresponding converter and the reference time constant, the estimation process comprising a first generation of a first item of differentiated power information relative to the original train and a second generation of a second item of information of differentiated power relative to at least one of the M filtered trains, andperforming a correction process of the original samples of the original train using the filtered samples of the corresponding filtered train and the corresponding estimated difference, in such a way as to deliver a corrected train of corrected samples.