[IEEE 2009 24th IEEE International Symposium on Defect and Fault Tolerance in VLSI Systems (DFT) - Chicago, Illinois, USA (2009.10.7-2009.10.9)] 2009 24th IEEE International Symposium on Defect and Fault Tolerance in VLSI Systems - A Reconfigurable ADC Circuit with Online-Testing Capability and Enhanced Fault Tolerance