A 10-bit 2.6-GS/s Time-Interleaved SAR ADC With a Digital-Mixing Timing-Skew Calibration Technique

A 16-channel time-interleaved 10-bit SAR analog-to-digital converter (ADC), employing the proposed delta-sampling auxiliary SAR ADCs and a digital-mixing calibration technique to compensate timing-skew error, achieves a 2.6-GS/s sampling rate. The ADC has been fabricated in a 40-nm CMOS technology and achieves a 50.6-dB signal-to-noise-and-distortion ratio at Nyquist rate while dissipating 18.4 mW from a 1.1-V power supply. The digital calibration improves interleaving spurious tones from -33.6 to -63.2 dB in the best case.