A tunable bandpass sigma-delta A/D conversion for mobile communication receiver

A channel selective A/D convertor for mobile communication receiver using ΣΔ modulation is presented. For input signals with different frequencies and relative small bandwidth, the bandpass ΣΔ convertor could serve both the roles of tuning and A/D conversion at the same time. The issues of sensitivity of the parameters to the channel selection and channel error tolerance level in terms of inband noise, which are associated with the implementation of channel selective ΣΔ A/D converter in mobile communication environment, are discussed. All the simulation and calculation are based on the simplified second order bandpass structure, and their results have given some indication to the trade-off between sensitivity and the overdesign necessary to meet the system sensitivity requirement