A 20 GHz bandwidth, 4 b photoconductive-sampling time-interleaved CMOS ADC

GaAs photoconductive switches are integrated with two parallel 4 b CMOS ADC channels for time-interleaved sampling of wideband signals. Peak SNDR exceeding 23 dB has been measured for inputs up to 20 GHz. Each channel dissipates 70 mW and occupies an area of 150 /spl mu/m-450 /spl mu/m in a 0.25 /spl mu/m CMOS technology.