All-digital multi-standard transmitter architecture using delta-sigma modulators
AssigneeFadhel M. Ghannouchi
InventorsFadhel M. Ghannouchi, Mohamed Helaoui, Safar Hatami, Renato Negra
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Abstract
The present disclosure is concerned with a digital transmitter using Delta-Sigma modulators (DMSs) that uses an up-sampler and modulator block that follows the DSMs to generate the RF equivalent of the baseband signal to be transmitted. The up-sampler and modulator block is simple to implement and contains only one or a few multiplexers implemented in high speed logic technology.
Claims17
A digital transmitter producing multiple binary stream output signals 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 multiple complementary binary stream pairs 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 multiple complementary binary stream pairs to transform the multiple complementary binary stream pairs into the multiple binary stream output signals 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 formats between the at least one delta-sigma modulator and an output of the up-sampler and modulator.
A digital transmitter producing a digital 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 digital 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 digital stream pair to transform the complementary digital stream pair into the digital 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 digital stream format between the at least one delta-sigma modulator and an output of the up-sampler and modulator.
Dependencies are inferred from the claim text.