Patent ID: 8164382
Filing Date: 2012-04-24
Classification: H03F

Abstract:
1. A switched-mode amplifier using uniform pulse-width modulation, having improved harmonic distortion performance, comprises: a loop filter, having inputs and an output, wherein a first input are analog signals, a second input are feedback signals from a power stage via a feedback/gain block, and the output are signals, which have the analog input signals and said feedback signals integrated and filtered from residual high-frequency signals; said feedback/gain block minimizing distortion and noise performance of an power stage; a pre-modulation block, attenuating amplitude dependent high frequency ripples, having inputs and an output, wherein a first input is the output from said loop filter and a second input is an output from an oscillator, and the output is input to a pulse-width modulation block; said pulse-width modulation block having inputs and an output, wherein a first input are the output signals from the pre-modulation block and a second input is an output from said oscillator, and the output of the pulse-width modulation block is the input of an output driver block, wherein the pulse-width modulation block performs double sampling in conjunction with the pre-modulation block; said oscillator wherein a first output is an input to the pre-modulation block and a second output is an input the pulse-width modulation block; said output driver block, wherein its output is the input of the power stage; and said power stage, wherein a first output of the power stage is said feedback signals to the loop filter and a second output of the power stage are amplified signals to a load.