A Low Power Dual-Mode Sigma-Delta Modulator for GSM/WCDMA Receivers

摘要

This paper proposes a low power dual-mode sigma-delta (∑△) modulator for GSM and WCDMA receivers. The proposed modulator satisfies both standards by modifying the transfer function without changing sampling frequency or the loop order. The simulation results show 85dB dynamic range for a GSM mode and 55dB for a WCDMA mode. The proposed modulator is designed in a 0.35μmCMOS process and consumes 5.5mW of power under 1.8-V supply.