High efficiency switched gain power amplifier

H - Electricity – 03 – F

Patent

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Details

H03F 3/72 (2006.01) H03F 3/60 (2006.01) H03G 1/00 (2006.01)

Patent

CA 2345089

A power amplifier circuit arrangement including a driver amplifier, a switch, an amplifier path having a band pass filter and a power amplifier, and a bypass path which bypasses the power amplifier when excess gain and output power are not needed. When an RF-analog signal from the driver amplifier is switched to the amplifier path, the signal is band-pass filtered and amplified. Then the signal is split into an in-phase and a quadrature signal. Either the in-phase or the quadrature signal is inverted and summed with the other of the in-phase or quadrature signal, and the summed signal is transmitted to an output port. When the RF-signal from the driver amplified is switched to the bypass path, the power amplifier is turned off and the bypass path directs the signal to the output of the power amplifier, which appears as a high impedance to the signal. The signal reflects off the power amplifier to the output port.

Circuit amplificateur de puissance comprenant un amplificateur pilote, un commutateur, un trajet d'amplification comportant un filtre passe-bande et un amplificateur de puissance, ainsi qu'un trajet de dérivation mettant l'amplificateur de puissance en dérivation quand un dépassement de gain et une puissance de sortie ne sont pas nécessaires. Quand un signal RF-analogique émis par l'amplificateur pilote est commuté vers le trajet d'amplification, ce signal est filtré par le filtre passe-bande et amplifié. Puis ce signal est divisé en un signal de phase et en un signal de quadrature. Soit l'un ou l'autre de ces signaux est inversé et additionné à l'autre signal de phase ou de quadrature et le signal additionné est transmis à une sortie. Quand le signal RF de l'amplificateur pilote est commuté vers le trajet de dérivation, l'amplificateur de puissance est mis hors service et le trajet de dérivation dirige le signal vers la sortie de l'amplificateur de puissance, ce qui se présente sous la forme d'une impédance élevée pour ce signal. Ce dernier sort de l'amplificateur de puissance par réflexion vers la sortie.

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