Effect of the Modification on Karthaus-Fischer Voltage Multipliers for Single Band GSM RF Energy Harvesting

In this study, we show that the effect of the modification on Karthaus-Fischer voltage multipliers for single band GSM RF energy harvesters. To be able to show that, we simulated both circuits for different conditions while assuming the load is purely resistive. Simulation results show that the Karthaus-Fischer voltage multiplier performs slightly better than the modified one in power efficiency but performs remarkably worse in current loading especially under low voltage and high output impedance conditions.