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A ten-bit (10b) 100 MS/s 0.18 ??m CMOS three-step pipeline ADC with various circuit sharing techniques is described. Two MDACs share a single two-stage low-power switched amplifier without MOS series switches and memory effects as observed in conventional shared op-amps. All three flash ADCs use only one resistor ladder rather than three for reference voltages while the second and third flash ADCs share pre-amps for area and power reduction. The prototype ADC with an active die area of 0.80 mm shows a maximum SNDR and SFDR of 54.2 and 68.8 dB, respectively, and consumes 24.2 mW at 1.8 V and 100 MS/s.