Patent ID: 6339360
Filing Date: 2002-01-15
Classification: H03F

Abstract:
A digital amplifier having an input for receiving an input signal comprising:an oscillator for producing a reference pulse signal and a sawtooth signal; a first signal generating circuit coupled to the oscillator responsive to said reference pulse signal for producing a first pulse signal of a first polarity; a second signal generating circuit coupled to the first signal generating circuit responsive to said first pulse signal and producing a second pulse signal of a polarity opposite the first polarity; a comparator responsively coupled to the input and said oscillator for comparing the input signal and the sawtooth signal and producing a comparator output signal operable between first and second states, said comparator for toggling said comparator output signal between the first and second states each time the input signal equals the sawtooth signal, said comparator output being maintained in one of the first and second states when the input signal exceeds the sawtooth signal; a pulse insertion circuit responsively coupled to the comparator and the first and second signal generating circuits for producing an insertion signal during intervals when the comparator output is maintained in either of the first or second states.