Patent ID: 8558617

Claim:
A multilevel class-D amplifier comprising: a first power stage having a first input, a second input, an output and at least three power inputs, said first power stage including logic such that when said first input is at a first logic level said output is at a first voltage level, when said first input is at a second logic level and said second input is at said first logic level said output is at a second voltage level, and when both said first input and said second input are at said second logic level said output is at a third voltage level; a second power stage having a first input, a second input, an output and at least three power inputs, said second power stage including logic such that when said first input is at a first logic level said output is at a first voltage level, when said first input is at a second logic level and said second input is at said first logic level said output is at a second voltage level, and when both said first input and said second input are at said second logic level said output is at a third voltage level; and a generator having a first output coupled to said first inputs of said first and second power stages and a second output coupled to said second inputs of said first and second power stages, wherein said first and second outputs of said generator are non-sinusoidal waveforms that are vertically offset with respect to each other.