Digital-compatible high-performance operational amplifier with rail-to-rail input and output ranges. - Wen-Chung S. Wu; Ward J. Helms; Jay A. Kuhn; Bruce E. Byrkett (IEEE J. Solid State Circuits, 1994)

A Bandpass Sigma-Delta for Software Low-Power and Low-Voltage Radio by Using PATH Technique. - Yiu Wu; John Ling; Ward J. Helms (Great Lakes Symposium on VLSI, 1999)

Matching considerations in I/Q A/D converter pairs. - Charles T. Peach; Waisiu Law; D. R. Beck; Ward J. Helms; David J. Allstot (ISCAS (3), 2002)

A mixed-signal calibration technique for low-voltage CMOS 1.5-bit/stage pipeline data converters. - Jianjun Guo; Waisiu Law; Charles T. Peach; Ward J. Helms; David J. Allstot (ISCAS (1), 2003)

A monotonic digital calibration technique for pipelined data converters. - Waisiu Law; Jianjun Guo; Charles T. Peach; Ward J. Helms; David J. Allstot (ISCAS (1), 2003)

Digital calibration for monotonic pipelined A/D converters. - Jianjun Guo; Waisiu Law; Ward J. Helms; David J. Allstot (IEEE Trans. Instrum. Meas., 2004)