Abstract
A delta-sigma modulator (DSM)-based fractional-N frequency synthesizer is the key component of wireless transceiver in wireless body area network (WBAN) system. The noise suppression performance, integration, and power of the DSM are difficult to balance in implementation. In order to choose a proper DSM topology for WBAN applications, a comparative study of single-loop DSM and Multi-stAge noise SHaping (MASH) DSM are presented in this chapter. Simulation and experiment results show that the MASH DSM is more suitable for WBAN applications with higher integration, lower power, and unconditional stability. Implemented in a 90 nm CMOS process, the proposed MASH DSM occupies an area of 40.5 × 45 μm and its power consumption is only 34 μW.
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