Design an optimized rectifier with TLBO based on threshold voltage cancellation technique.

In this paper a full wave rectifier is presented for RFID passive tags working at 960 MHz frequency. For designing the rectifier multi-stage structure, which has high sensitivity and efficiency, is used for the low amplitude input voltage. In order to eliminate the effect of pass transistors threshold voltage, bootstrap circuit which has cross coupled structure is utilized. For optimizing power conversion efficiency (PCE) and gaining high output voltage from the low input voltage the size of the elements and number of stages are modeled and optimized with neural network and TLBO algorithm, respectively. Due to the achieved results from the TLBO algorithm 6 stages are considered for the rectifier designing. For the low input voltage 0.6 V, the power conversion efficiency and the output DC voltage are achieved 50.8% and 1.52 V, respectively. The simulation of the proposed rectifier is done with Cadence software in 0.18μm CMOS technology and its layout equals to 0.00525mm2. [ABSTRACT FROM AUTHOR]