[IEEE 2011 IEEE MTT-S International Microwave Workshop Series on Intelligent Radio for Future Personal Terminals (IMWS-IRFPT) - Daejeon, Korea (South) (2011.08.24-2011.08.25)] 2011 IEEE MTT-S International Microwave Workshop Series on Intelligent Radio for Future Personal Terminals - A 0.4V 6.5nW 10b 2.5kS/s asynchronous SAR ADC