A 20 GS/s 5-Bit SiGe BiCMOS Dual-Nyquist Flash ADC With Sampling Capability up to 35 GS/s Featuring Offset Corrected Exclusive-Or Comparators. - Robert A. Kertis; James S. Humble; Mary A. Daun-Lindberg; Rick A. Philpott; Karl E. Fritz; Daniel J. Schwab; Jason F. Prairie; Barry K. Gilbert; Erik S. Daniel (IEEE J. Solid State Circuits, 2009)