ASK-modulator design of RFID tag in 180nm CMOS technology

This paper presents the simulation results of an Amplitude-shift keying (ASK) modulator in 180nm CMOS technology for an radio frequency identification (RFID) tag. It can operates even at low voltage VDD=1V. This modulator based on the voltage multiplier. The proposed circuit can made the multiplication of two signals, a carrier signal (high frequency sinusoidal signal) and a modulating signal (low frequency signal), we chose a square signal that has a binary sequence of data to transmit, the output voltage presents a variation of amplitude of the carrier and is called the modulated signal. We designed two circuits do the same function and can be used for RFID tags.