Hi,

I am designing a rectifier and need to calculate the efficiency.

I have followed the below procedure:

1. Designed a rectifier using MOSes with RF signal at 865MHz with a load current of 4uA.

2. Simulated the rectifier using transient analysis. I tried to vary the design variable 'v' (Input Voltage amplitude) to monitor the dc voltage.

3. In order to calculate the efficiency, I need to know the ac power and dc power. When I gave input voltage of 450mV (amplitude), I observed the plot of 412mV as dc output. So, my dc power is 4uA * 412mV.

4. Coming to ac power, I did ac analysis by sweeping the design variable 'v' at frequency of 865MHz. Then, in the calculator using Vf and If, I selected the net and node of the voltage source.Then, I selected the "average" function. Am I correct? Will the average of the (V*I) gives the ac power? By doing so, I didn't observe desired plots.

Can you please let me know how to calculate the ac power? Is there any other procedure to do the same? If I have done any mistake in the above procedure,please correct me.