A two-path bandpass ΣΔ modulator for digital IF extraction at 20 MHz. - Adrian K. Ong; Bruce A. Wooley (IEEE J. Solid State Circuits, 1997)

A method for reducing the variation in "on" resistance of a MOS sampling switch. - Adrian K. Ong; Vladimir I. Prodanov; Maurice Tarsia (ISCAS, 2000)