Patent ID: 6518902
Filing Date: 2003-02-11
Classification: H03M

Abstract:
A PC card having radio frequency (RF) communication capability, comprising:a digital baseband; an RF section; an RF interface coupling said digital baseband to said RF section, wherein said RF interface further comprises a delta-sigma digital-to-analog converter having a digital input and an analog output comprising: a storage means having stored outputs of a delta-sigma converter fed by a number of predetermined interpolated samples corresponding to all possible values of said digital input; said storage means coupled to receive said digital input; a plurality of digital-to-analog converters coupled to said storage means to receive said stored outputs, said plurality of digital-to-analog converters clocked by multi-phase clocks wherein each phase applied to each of said plurality of digital to analog converters is delayed with respect to a next one by an oversampling period equal to the Nyquist period divided by the number of predetermined interpolated samples; and a summer coupled to said plurality of digital-to-analog converters for summing all output from said plurality of digital-to-analog converters to generate said analog output.