Design and Implementation of a Reconfigurable Decimation and Channel Selection Filter for GSM and UMTS Radio Standards

This work presents a low-power multistandard decimation and channel selection filter architecture. The filter is suitable after an over-sampling sigma-delta converter and performs decimation in two stages. The first stage is a modified structure of the cascade of integrators-combs (CIC) filter and allows reducing sampling rate downto only the double of the Nyquist frequency. The second stage composed of classical FIR filter, has relaxed specifications and performs channel selection. Implementation of the proposed filter for UMTS and GSM standards shows good filtering performances. The signal to ratio measured for UMTS is 14,65 dB and for GSM 26,96 dB which satisfy largely the standards requirements. Implementation on ASIC 65-nm process technology shows power consumption gain of 14% in comparison to previously proposed low-power architecture.