A Low Power Consumption Voltage Reference Circuit for Passive RFID Tags

In order to increase the reading range and remote control, the blocks on the RFID tag should be designed in a way that they dissipate lower power. In this paper, a voltage reference circuit with 1 V supply voltage for smart police applications is presented. In the proposed voltage reference structure, MOSFET transistors biased in the sub-threshold region. To generate complementary to absolute temperature voltage (CTAT), the voltage of a pn junction (PN junction) generated by a PMOS transistor To achieve the reference voltage of about 753 mV, two proportional to absolute temperature voltage (PTAT) stages are added to the CTAT voltage to create a reference voltage with a minimum temperature dependence. The voltage reference is simulated in the 0.18 μm standard CMOS technology and its area occupation is 0.0064 mm2. The results from post-layout simulation show that in the temperature range of 0°C to 110 °C, the temperature coefficient (TC) is 19.7 ppm/°C. The line regulation (LR) under supply voltage variation from 0.8 V to 1.2 V is equal to 0.058 %/ V. Also, the current consumption of voltage reference is obtained 13.2 nA.