How to calculate the power of high frequency signals?

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How to calculate the power of high frequency signals using analog or digital circuit?
I want to calculate the high-pass filter output signal's power, the accuracy needn't be very high because I just want to compare the output signals' power. Thanks in advance!
 

For the calculation power in the large-signal or switch-cap or high frequency circuits we have to calculate:
p=(∫i.vdd.dt)1/T
 

You can click on the terminal to measure the current going to the block in question. Clip the waveform using the 'clip' function in the calculator to remove the start-up transient effects. Take the average of the current waveform and then multiply by the voltage at the block to get the power.

If you meant 'power delivered to the load', then you can do the same thing with the terminal being the load terminal instead of the vdd of the block.

The post right above mine gives you the formula for it.
 

Thanks for all your advice!
But my question is how to measure small signal's power strength using on-chip analog or digital circuit. It should be implemented by hardware
 

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