Analysis of Four-Stage Charge Pump Circuit for UHF RFID Tag Design

Abstract

This work presents the analysis of a charge pump circuit for UHF RFID tag design using 22nm CMOS technology. A charge pump circuit is basically a DC to DC converter. This circuit can be used in many systems for its high performance and low power consumption. Hence, this voltage charge pump circuit can be used in low voltage applications such as in RFID tag's EEPROM. This charge pump circuit has been used as a part of the power supply unit of a fully integrated RFID transponder IC. This modified circuit can generate a stable output voltage with low power dissipation and higher gain for RFID applications. Measured output of this circuit at 433MHz frequency with 1pF of pumping capacitor value, is 3.48V which is more than the value of the industry standardized voltage 3.3V. The extensive simulations are done by using T-spice simulator.