Fully Digital On-Chip Wideband Background Calibration for Channel Mismatches in Time-Interleaved Time-Based ADCs

Okko Jarvinen*, Ilia Kempi, Vishnu Unnikrishnan, Kari Stadius, Marko Kosunen, Jussi Ryynänen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

This letter presents a fully integrated on-chip digital mismatch compensation system for time-based time-interleaved (TI) data converters. The proposed digital compensation features blind calibration of gain, offset, and timing mismatches. The implemented system uses time-based sampling clock mismatch detection, achieving convergence within 32K samples, which is on par with analog-assisted background methods. A specialized filter structure compensates for timing mismatches of magnitude up to 0.21 of the sampling period, nearly triple the range of other published digital compensation methods, and is effective for input signals up to 0.92 Nyquist bandwidth. The on-chip digital correction achieves suppression of all mismatch tones to levels below −60 dBc while running fully in the background. The operation is demonstrated with an 8× TI 2-GS/s analog-to-digital converter (ADC) prototype chip implemented in a 28-nm CMOS process.
Original languageEnglish
Pages (from-to)9-12
Number of pages4
JournalIEEE Solid-State Circuits Letters
Volume5
DOIs
Publication statusPublished - 24 Jan 2022
MoE publication typeA1 Journal article-refereed

Keywords

  • time based
  • time interleaving
  • analog-to-digital converter (ADC)
  • cyclic-coupled ring oscillator (CCRO)
  • digital calibration
  • finite-impulse response (FIR)
  • least mean-square (LMS)
  • mismatch
  • timing skew

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