Abstract
This paper presents a sixth-order continuous-time bandpass sigma delta modulator (SDM) for analog-to-digital conversion of 10.7MHz intermediate frequency (IF) signals in AM/FM broadcast radio receivers. Sampled at 40MHz, the single-loop one-bit SDM achieves 67dB SNDR in 200kHz and 80dB in 9kHz. The third order intermodulation (IM3) is at -82dBc for a -10dBFS input level. The 0.5μm CMOS chip occupies 0.9×0.4mm2 and consumes 60mW at 3.3V (digital) and 5.0V (analog). The sample frequency is variable and can be set from 30MHz to 80MHz.
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