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Conception et intégration d'un synthétiseur digital direct micro-onde en technologie silicium SiGe:C 0.25um

Stéphane Thuries 1
1 LAAS-MOST - Équipe Microondes et Opto-microondes pour Systèmes de Télécommunications
LAAS - Laboratoire d'analyse et d'architecture des systèmes
Abstract : Direct Digital Synthesizer (DDS) is a very versatile signal generation block, known to have many attractive characteristics among which: fast settling time, high frequency resolution, low phase noise, phase and frequency modulation capabilities, large bandwidth... All these features make DDS very attractive for modern microwave telecommunication systems. Although the principle of DDS has been known for many years, it did not get a dominant role in microwave communication systems due to its frequency limitation and high power consumption. A 6-GHz low power SiGe direct digital synthesizer (DDS) is reported. The DDS consists of a phase accumulator, a complementer, a digital-to-analog (D/A) converter and a bipolar differential pair. This paper discusses on the BiCMOS improvement design techniques used for the phase accumulator and the phase-to-amplitude conversion in order to achieve higher speed operation and lower power consumption compared to existing DDS. The phase accumulator is based on a three-levels BiCMOS logic which is used to implement the 1 bit full-adder and the D-flip-flop register. With this design, the power dissipation is reduced by 30 % over the usual four-levels series logic. The phase-to-amplitude conversion is completed through a bipolar differential pair instead of a ROM and/or complex computing circuit, providing significant saving in power consumption and die size. The circuit has been processed in a BiCMOS SiGe:C technology. The power consumption is 308 mW and it operates from a 2.8 V supply.
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Stéphane Thuries. Conception et intégration d'un synthétiseur digital direct micro-onde en technologie silicium SiGe:C 0.25um. Micro et nanotechnologies/Microélectronique. Université Paul Sabatier - Toulouse III, 2006. Français. ⟨tel-00130065⟩

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