A 3.3 V, 12b, 50MSample/s A/D converter in 0.6 /spl mu/m CMOS with over 80 dB SFDR

Modern wireless base stations digitize the entire received frequency band, and separate individual channels with digital filters. This requires an A/D converter (ADC) with an effective resolution bandwidth of 20 MHz or more, and a spurious-free dynamic range (SFDR) greater than 85 dB to avoid confusion of a weak received channel with spurious tones. To date, only bipolar ADCs have met these specifications. This high-SFDR wideband ADC implemented in 0.6 /spl mu/m CMOS on a 3M1P epi substrate requires no trimming, calibration or dithering.