A time-interleaved ADC employs four pipelined time-interleaved channels along with a new timing mismatch detection algorithm and a high-resolution variable delay line. The digital background calibration technique suppresses the interchannel timing mismatches, achieving an SNDR of 44.4 dB
and a figure of merit of 219 fJ/conversion-step in 65 nm CMOS technology.
H. Wei, Zhang, P., Sahoo, B. Datta, and Razavi, B., “An 8 Bit 4 GS/s 120 mW CMOS ADC.”, Journal of Solid-State Circuits, vol. 49, pp. 1751–1761, 2014.