Patent ID: 7535263

Claim:
A process of detecting peak-to-peak voltage comprising: performing a first comparison of a high frequency AC waveform voltage to a buffered voltage of a first capacitor; charging the first capacitor responsive to the first comparison indicating the high frequency AC waveform voltage is greater than the buffered voltage of the first capacitor; inverting a buffered voltage of a second capacitor; performing a second comparison of the inverted buffered voltage of the second capacitor to the high frequency AC waveform voltage; charging the second capacitor responsive to the second comparison indicating the inverted buffered voltage of the second capacitor is greater than the high frequency AC waveform voltage; and outputting a voltage based on a difference between the buffered voltage of the first capacitor and the inverted buffered voltage of the second capacitor, the output voltage indicative of a peak-to-peak voltage of the high frequency AC waveform voltage.