A 2.5 V 12 b 54 MSample/s 0.25 /spl mu/m CMOS ADC in 1 mm/sup 2/

Background digital offset extraction and analog compensation remove offset of the critical analog components. The calibrated two-step ADC achieves -70 dB THD in the Nyquist band with a 2.5 V supply. The ADC in 0.25 μm CMOS measures 1.0 mm/sup 2/ and dissipates 295 mW.