Patent ID: 7560959

Claim:
A peak voltage detector for detecting the peak amplitude of an input signal, the peak voltage detector comprising: a capacitor coupled to a feedback node; a first comparator coupled to receive the input signal and to receive a feedback signal from the feedback node, the first comparator being operable to compare the amplitude of the feedback signal to the amplitude of the input signal and to generate a first output signal when the amplitude of the input signal is greater than the amplitude of the feedback signal; a second comparator coupled to receive the input signal and to receive the feedback signal from the feedback node, the second comparator being operable to compare the amplitude of the feedback signal to the amplitude of the negative of the input signal and to generate a second output signal when the amplitude of the negative of the input signal is greater than the amplitude of the feedback signal; and a current source coupled to the first and second comparators, the current source being operable to couple current to the feedback node responsive to receiving either the first output signal from the first comparator or the second output signal from the second comparator.