Adaptive and digital blind calibration of transfer function mismatch in time-interleaved ADCs

Author

De Teyou, Gael Kamdem ; Petit, Herve ; Loumeau, Patrick

Author_Institution

Telecom ParisTech, Paris, France

fYear

2015

fDate

7-10 June 2015

Firstpage

1

Lastpage

4

Abstract

In this paper we propose a digital blind calibration scheme for Time-Interleaved ADCs based on transfer function mismatch which corrects gain, time-skew and bandwidth mismatch errors. The estimation of mismatches uses an adaptive filtering structure with a lowpass filter combined to a fractional delay filter. The compensation is based on the development of a matrix approach to cancel the effect of mismatches. The algorithm was tested with a two-channel 14-bits ADCs board connected to a FPGA and the results show the effectiveness of the technique.

Keywords

adaptive filters; analogue-digital conversion; calibration; delay filters; field programmable gate arrays; low-pass filters; FPGA; adaptive blind calibration; adaptive filtering structure; digital blind calibration; fractional delay filter; lowpass filter; time-interleaved ADC; transfer function mismatch; Bandwidth; Calibration; Conferences; Delays; Estimation; Gain; Transfer functions; ADCs; FPGA; Time-Interleaved; adaptive; blind calibration; channel mismatches;

fLanguage

English

Publisher

ieee

Conference_Titel

New Circuits and Systems Conference (NEWCAS), 2015 IEEE 13th International

Conference_Location

Grenoble

Type

conf

DOI

10.1109/NEWCAS.2015.7182121

Filename

7182121