Patent ID: 6191722
Filing Date: 2001-02-20
Classification: H03M

Abstract:
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 3 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; anda 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 a ratio of said second amplitude to said first amplitude is 1/(2.sup.K).