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Hey everyone, I am trying to calculate the PCE (power conversion effeciency) of a 5 stage low power voltage multiplier using the HSMS-2850 Scottky diode and I have some kind of error because the value goes beyond 100% after a certain input power value.

I tried to use 2 different methods to calculate the PCE and they are both problematic (They can be seen in the images).

A transient simulation of input and output voltage is shown at an input power or -20dBm.

[ATTACH=full]193078[/ATTACH]

[ATTACH=full]193079[/ATTACH]

[ATTACH=full]193080[/ATTACH]

Also, voltage multipliers with fewer stages should have a higher value of PCE because there is less power loss in the diodes, but I get the opposite when I simulate voltage multipliers with less stages...

What may be the problem? Is it the sceme or is it the calculation method?

Kindly help.