A low power, high bandwidth continuous-time delta-sigma modulator is proposed in this paper. In contrast to traditional continuous-time delta-sigma modulators, this design utilizes passive networks, consisting of only resistors and capacitors, to perform part of the functions of loop filters. Passive networks do not consume power, introduce no distortions. For similar performance, considerable power can be saved. Based on the proposed technique, a 1.1 MHz delta-sigma modulator is designed for 0.25mum CMOS technology. Simulation results show that this modulator can reach 14b performance with only about 15mWpower consumptions