Predistortion generator coupled with an rf amplifier

Details Predistortion generator coupled with an rf amplifier Predistortion generator coupled with an rf amplifier

H - Electricity

03

F

H03F 1/32 (2006.01) H03F 1/52 (2006.01) H05K 1/02 (2006.01) H05K 3/00 (2006.01)

Patent

CA 2369495

An in-line distortion generator is coupled to an RF amplifier on a single PC board for producing an output signal of useful amplitude but with low composite triple beat and cross modulation distortions. The backplane under the section of the PC board upon which the distortion circuit resides is removed and the portion of the heat sink under the removed portion of the backplane is also removed. This eliminates any parasitic capacitances that could degrade the performance of the RF amplifier, thereby making the distortion circuit transparent to the RF amplifier. Furthermore, the layout of the predistortion circuitry has been specifically designed to enhance the performance of the circuitry without inducing any negative operating characteristics on the associated RF amplifier.

La présente invention concerne un générateur de distorsion en ligne couplé à un amplificateur HF sur une carte de PC unique de façon à produire un signal de sortie d'une amplitude utile, mais avec un faible battement composite triple et des distorsions d'intermodulation. Le panneau arrière sous la section de la carte de PC sur lequel le circuit de distorsion est situé est retiré et la partie du drain thermique sous la partie retirée du panneau arrière est également retirée. Ceci permet d'éliminer toutes les sources de parasites qui peuvent dégrader les performances de l'amplificateur HF, rendant ainsi le circuit de distorsion transparent pour l'amplificateur HF. En outre, le tracé des circuits de distorsion préalable a été spécifiquement conçu pour renforcer les performances des circuits sans induire la moindre caractéristique de fonctionnement négative sur l'amplificateur HF associé.

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