This paper presents an efficient design of a decimation filter for a continuous-time (CT) complex lowpass ΣΔ modulator in Multi-standards receiver. The proposed architecture meets the requirements of three standards: Wi-max, UMTS and GSM. The optimization of the proposed decimation structure leads to three implementation architectures which optimized in different ways : area (in terms of used resources) and power consumption for the required thruoghtput. Experimental results illustrate the high-speed data throughput and low-power consumption features of the proposed designs.