Efficient signal reconstruction scheme for M-channel time-interleaved ADCs
2013 (English)In: Analog Integrated Circuits and Signal Processing, ISSN 0925-1030, E-ISSN 1573-1979, Vol. 77, no 2, 113-122 p.Article in journal (Refereed) Published
In time-interleaved analog-to-digital converters (TI-ADCs), the timing mismatches between the channels result in a periodically nonuniformly sampled sequence at the output. Such nonuniformly sampled output limits the achievable resolution of the TI-ADC. In order to correct the errors due to timing mismatches, the output of the TI-ADC is passed through a digital time-varying finite-length impulse response reconstructor. Such reconstructors convert the nonuniformly sampled output sequence to a uniformly spaced output. Since the reconstructor runs at the output rate of the TI-ADC, it is beneficial to reduce the number of coefficient multipliers in the reconstructor. Also, it is advantageous to have as few coefficient updates as possible when the timing errors change. Reconstructors that reduce the number of multipliers to be updated online do so at a cost of increased number of multiplications per corrected output sample. This paper proposes a technique which can be used to reduce the number of reconstructor coefficients that need to be updated online without increasing the number of multiplications per corrected output sample.
Place, publisher, year, edition, pages
Springer, 2013. Vol. 77, no 2, 113-122 p.
Finite-length impulse response (FIR) filters, Least-squares design, Two-rate approach, Periodically nonuniform sampling, Time-interleaved analog-to-digital converters (TI-ADCs), Reconstruction filters
IdentifiersURN: urn:nbn:se:liu:diva-100965DOI: 10.1007/s10470-013-0115-xISI: 000326453400004OAI: oai:DiVA.org:liu-100965DiVA: diva2:664481
FunderSwedish Research Council