Design and simulation of a phase-shift backscatter modulator for VHF RFID tag at 900 MHz

Traditional passive VHF RFID tags use amplitude shift keying (ASK) or phase shift keying (PSK) to communicate information contained in the tag's memory or sensors to a remote reader. This document proposes phase-shift backscatter modulation to transmit information from the label to the reader. The methodology is derived from a combined and modified approach to previous studies. This type of modulator can modulate in the ultra-high frequency waveband, enabling high data rates with low power consumption. A simulation of the design is carried out in 0.18µm CMOS technology, with a supply voltage of 1 V, using ADS software.