Pulse width modulation digital to analog converter

An apparatus for producing a measurable physical parameter having a first value, said first value being a function of an N bit digital data element, said digital data element having a J bit most significant portion and a K bit least significant portion, comprising:

• a pulse generator for receiving said digital data element and producing at least a first periodic signal and a second periodic signal, said first periodic signal having a first amplitude and a first duty cycle representative of said J bit most significant portion, said second periodic signal having a second amplitude and a second duty cycle representative of said K bit least significant portion;
• a combiner for receiving said first periodic signal and said second periodic signal, and for producing a periodic composite signal having a composite duty cycle and a plurality of composite amplitudes;
• and,
• a filter for receiving said composite signal and producing said physical parameter, said first value being representative of said composite duty cycle and said plurality of composite amplitudes,
• wherein each of said first and second periodic signals include a plurality of time slots selectably occupied by a plurality of pulses as a function of said digital data element, so as to produce said first duty cycle and said second duty cycle, respectively, said pulses being distributed within each period of said periodic signal, said period having a duration T, among time slots beginning at the start of the period T0, at T0+T/4, at T0+T/2 and at T0+3T/4, such that said pulses are equally allotted, first to time slots beginning at T0, then to time slots beginning at T0+T/2, then to time slots beginning at T0+T/4, then to time slots beginning at T0+3T/4.