This paper presented a single-bit fourth-order sigma delta modulator for dual-standard receiver.The low voltage and low power target is attained by improving the modulator structure and optimizing from system to circuit blocks.Hspice and Matlab co-simulation with 0.35μm CMOS technology indates that dynamic range is 86dB for GSM
36dB for WCDMA respectively and power dissipation is only 10.5mW and 12mW with 2V power supply.