Patent ID: 8724733

Claim:
A digital transmitter producing a binary stream output signal at a desired RF carrier frequency from an amplitude or amplitude and phase varying baseband modulated or IF modulated input signal, the digital transmitter comprising: at least one delta-sigma modulator operating at a first clock frequency independent from the desired RF carrier frequency and so configured as to receive and convert the amplitude or amplitude and phase varying baseband modulated or IF modulated input signal into a complementary binary stream pair having a first data rate equal to the first clock frequency and having a carrier frequency equal to zero or to an intermediate frequency; an up-sampler and modulator so configured as to receive and multiplex, at a second clock frequency independent from the first clock frequency, the complementary binary stream pair to transform the complementary binary stream pair into the binary stream output signal having a second data rate greater than the first data rate, greater than the desired RF carrier frequency, and calculated as a function of the desired RF carrier frequency; wherein the digital transmitter is an all-digital transmitter that maintains all signals in binary stream format between the at least one delta-sigma modulator and an output of the up-sampler and modulator.