Patent ID: 7242248
Filing Date: 2007-07-10
Classification: H03F

Abstract:
1. A Class D amplifier that receives an input signal, comprising: a signal generator that generates first and second periodic signals wherein each period of said first periodic signal comprises first and second intervals, and each period of said second periodic signal comprises third and fourth intervals, wherein said first periodic signal monotonically increases during said first interval and monotonically decreases during said second interval, said second periodic signal monotonically decreases during said third interval and monotonically increases during said fourth interval, and wherein said first and third intervals are substantially aligned, and said second and fourth intervals are substantially aligned; and a crossing detector that generates a first transition signal when a voltage of said first periodic signal transitions in a first direction across a voltage of the input signal and when a voltage of said second periodic signal transitions in said first direction across a voltage of the input signal and a second transition signal when a voltage of said first periodic signal transitions in a second direction across a voltage of the input signal and when a voltage of said second periodic signal transitions in said second direction across a voltage of the input signal, wherein said second direction is opposite to said first direction.