A 10.7MHz Self-Calibrated SC Multibit 2nd-Order Bandpass ΣΔ Modulator

摘要

A 2nd-order multibit BandPass ΣΔ Modulator (BPΣΔM) tornbe used for 10.7MHz IF sampling of the AM/FMrnbroadcasting radio signal is presented. The modulator isrnrealized with SC technique and it is sampled at 37.05MHz.rnThe accuracy of the in-band noise shaping is ensured withrntwo self-calibrating control systems. In a 0.18μm CMOSrntechnology the device die size is 1mm~2 and the powerrnconsumption is 75mW. The modulator features 76dB dynamicrnrange and 67dB peak-SNR within a 200kHz bandwidth (FMrnbandwidth).