A 12-bit 10GS/s Time-Interleaved SAR ADC with Even/Odd Channel-Correlated Absolute Error-Based Over-Nyquist Timing-Skew Calibration in 5nm FinFET

This paper presents an over-Nyquist 12-bit 10GS/s time-interleaved (TI) ADC with a background timing-skew calibration. An absolute error-based auto-correlation algorithm enables calibration of time skew for both the first and second Nyquist inputs, while an even and odd channel-based auto-correlation algorithm requires only three calibration steps. A prototype 10GS/s ADC in 5nm FinFET achieves a SNDR of 50.2dB and 46.2dB at input frequencies of 5GHz and 9GHz, respectively. The ADC consumes 386mW resulting in a $\text{FoM}_{\text{Walden}}$ and $\text{FoM}_{\text{Schreier}}$ of 146.0fJ/c-s. and 151.3dB, respectively.