A fully-differential, 10-b, 40-Msample/s pipelined analog-to-digital converter (ADC) has been developed and tested, The converter exhibits a signal-to-(noise + distortion) ratio (SNDR) of 57.1 dB and consumes <400 mW of power from a single 5 V supply, The converter can digitize not only a fully-differential but also a single-ended input signal over a wide input range with little variation in converter performance, In addition, a full-power bandwidth (FPBW) of >250 MHz is made possible with the open-loop sampling scheme.