Improvements relating to eer transmitters

Details Improvements relating to eer transmitters Improvements relating to eer transmitters

H - Electricity

03

C

H03C 5/00 (2006.01) H03F 1/02 (2006.01) H03F 1/32 (2006.01) H03L 7/089 (2006.01) H03L 7/18 (2006.01) H04L 27/34 (2006.01) H03L 7/197 (2006.01)

Patent

CA 2385948

Amplification systems based on EER techniques, generally using digital methods to determine envelope and phase information. Cartesian or predistortion feedback is preferably used to improve a range of characteristics. Envelope modulation may be implemented in various ways such as a sigma delta modulator. Phase modulation may also be implemented in various ways such as a fractional N phase lock loop.

Cette invention a trait à des systèmes amplificateurs reposant sur des techniques EER (élimination et restauration d'enveloppe), utilisant, d'une manière générale, des méthodes numériques afin de déterminer une information d'enveloppe et de phase. On utilise, de préférence, une rétroaction cartésienne ou de prédistorsion afin d'améliorer l'éventail des caractéristiques. La modulation d'enveloppe peut être mise en oeuvre de diverses façons, notamment par l'utilisation d'un modulateur sigma delta et la modulation de phase peut également être mise en oeuvre de diverses façons, notamment par l'utilisation d'une boucle à phase asservie N.

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