Abstract:

A lower-power and calibrated bandgap reference circuit for passive RFID chip is proposed.The design is only made up of MOSFETs and resistors,and most of MOSFETs work in subthreshold region, thus producing voltage reference and current reference in the same time.The reference circuit,fabricated in a 0.13 μm GSMC 1P5M process,can operate with a supply voltage ranging from 0.9 V to 2.5 V and draws a current as low as 350 nA with the 1.2 V supply voltage.Its temperature coefficients of voltage reference and current reference are 30.3 ppm/℃ and 20.7 ppm/℃ respectively under working temperature from -45℃ to 65℃.        

Key words: lower-power;bandgap reference;calibrated;subthreshold