A Timing Skew Correction Technique in Time-Interleaved ADCs Based on a DeltaSigma Digital-to-Time Converter

Konferenz: SMACD / PRIME 2021 - International Conference on SMACD and 16th Conference on PRIME
19.07.2021 - 22.07.2021 in online

Tagungsband: SMACD / PRIME 2021

Seiten: 4Sprache: EnglischTyp: PDF

Be, Gabriele; Mercandelli, Mario; Bertulessi, Luca (Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, Milano, Italy)

This paper reviews state-of-the-art skew correction methods in time-interleaved (TI) analog-to-digital converters (ADCs) and introduces a novel mixed-signal skew correction technique based on dithering the control word of a digital-totime converter (DTC), which significantly relaxes the stringent DTC resolution requirements. Simulation results of a 10 GS/s 8– bit 16-core TI-ADC reveal that the proposed technique reduces the required DTC resolution by a factor of 4x and improves the spurious-free dynamic range (SFDR) by up to 10 dB with a negligible noise penalty.