Experimental Performance Analysis of a Modified Five-stage Diode-based and Two-stage Cross-couple MOS-based Circuits in the Application of RF Energy Harvesting
Joydeep Banerjee and Subhasish Banerjee
This study focuses on the experimental performance analysis of a modified five-stage Schottky diode-based circuit and a two-stage cross-couple MOS-based circuit for the improvement of output performance for RF Energy harvesting circuits. The effect on the output voltage level for the variation of input frequency and load resistance has been studied experimentally. The modified diode-based circuit is capable to increase the rectified dc output voltage level significantly providing output voltage 4.37 V at 5 MHz for 1V peak-to-peak RF input voltage. The experimental rectified dc output voltage for two-stage MOS-based cross couple circuit has been increased by 1.71 times and 1.44 times in the second stage compared to first stage for 100 KΩ and 1 KΩ load resistance respectively. The rectified dc output voltage of diode-based circuit at final stage increased by 4.37 times and 3.6 times for 1 V and 500 mV peak-to-peak input voltages respectively. The maximum experimental RF to dc conversion efficiency is obtained 77.29 % for Schottky diode-based circuit. Experimental harvested voltage is obtained as 0.9 mV at 2.45 GHz wi-fi frequency and 5.5 mV at 93.5 MHz FM for low receiving input voltage.
Keywords: RF energy harvesting, cross couple MOS, greinacher voltage multiplier, villard circuit, schottky diodes circuits, experimental performance of energy harvesting circuits