Abstract: Aiming at the request of low power and small area of UHF RFID tags,this paper presents a baseband processor, which is compatible with the“EPCTM Class-1 Generation-2 UHF RFID Protocol”.The method of module division and a new architecture are proposed based on the analysis of the tag's function.The lowest frequency that a tag needs is discussed and computed.A power management module is designed for both power reduction and scheduling modules in order to make them work in a correct way.The pipelining way of encoding the outputs is adopted.This paper also designs a simplified memory interface.The result of simulation accords with the protocol,and the design has been synthesized, whose area is about 7 200 gates.The circuit can be applied to a UHF RFID tag.