Patent ID: 7977994

Claim:
A digital pulse-width modulator comprising: a delay line comprising an input for receiving an input signal and a plurality of delay cells connected in series, the plurality of delay cells comprising at least two discretely adjustable delay cells, wherein the delay line is configured to propagate the input signal through the plurality of delay cells; a multiplexer comprising a plurality of inputs and an output, each of the plurality of inputs of the multiplexer coupled to an output of one of the plurality of delay cells of the delay line, wherein the output of the multiplexer is selected from the plurality of inputs of the multiplexer based upon at least a portion of a duty cycle command; and a controller coupled to outputs of at least two delay cells in the delay line, the controller sampling the outputs at the end of a reference period to obtain a first sampled discrete value and a second sampled discrete value, comparing the first discrete value to the second discrete value, and determining a digital control code for discretely and independently adjusting a delay of the discretely adjustable delay cells based upon the comparison of the first discrete value to the second discrete value.