Adaptive blind calibration of timing offset and gain mismatch for two-channel time-interleaved ADCs
- 19 June 2006
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Circuits and Systems I: Regular Papers
- Vol. 53 (6), 1278-1288
- https://doi.org/10.1109/tcsi.2006.875180
Abstract
In this paper, we describe a blind calibration method for gain and timing mismatches in a two-channel time-interleaved low-pass analog-to-digital converters (ADC). The method requires that the input signal should be slightly oversampled. This ensures that there exists a frequency band around the zero frequency where the Fourier transforms of the ADC subchannels are alias free. Low-pass filtering the ADC subchannels to this alias-free band reduces the blind calibration problem to a conventional gain and time delay estimation problem for an unknown signal in noise. An adaptive filtering structure with three fixed FIR filters and two adaptive gain and delay parameters is employed to achieve the calibration. A convergence analysis is presented for the blind calibration technique. Numerical simulations for a bandlimited white noise input and for inputs containing several sinusoidal components demonstrate the effectiveness of the proposed methodKeywords
This publication has 24 references indexed in Scilit:
- Blind equalization of time errors in a time-interleaved ADC systemIEEE Transactions on Signal Processing, 2005
- Signal recovery in time-interleaved analog-to-digital convertersPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2004
- Reconstruction of Band-Limited Periodic Nonuniformly Sampled Signals Through Multirate Filter BanksIEEE Transactions on Circuits and Systems I: Regular Papers, 2004
- Calibration of Sample-Time Error in a Two-Channel Time-Interleaved Analog-to-Digital ConverterIEEE Transactions on Circuits and Systems I: Regular Papers, 2004
- Blind Adaptive Equalization of Mismatch Errors in a Time-Interleaved A/D Converter SystemIEEE Transactions on Circuits and Systems I: Regular Papers, 2004
- A 10-b 120-Msample/s time-interleaved analog-to-digital converter with digital background calibrationIEEE Journal of Solid-State Circuits, 2002
- On explicit time delay estimation using the Farrow structureSignal Processing, 1999
- Splitting the unit delay [FIR/all pass filters design]IEEE Signal Processing Magazine, 1996
- A new algorithm for explicit adaptation of time delayIEEE Transactions on Signal Processing, 1994
- Digital spectra of nonuniformly sampled signals: a robust sampling time offset estimation algorithm for ultra high-speed waveform digitizers using interleavingIEEE Transactions on Instrumentation and Measurement, 1990