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AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsUlf Gustavsson, Richard Hellberg
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The present invention relates to a composite amplifier (3, 4, 120), a radio terminal (100) including such composite amplifier and to a method for improving the efficiency of such composite amplifier in particular. The composite amplifier according to embodiments of the present invention is arranged to be connected to an output combiner network (43, 53, 63, 73, 83) and to a load (49, 130), the output combiner network comprising at least one dynamically tuneable reactance (47, 48). The instantaneous efficiency of the composite amplifier (3, 4, 120) is increased by tuning the impedances/admittances seen by each of said at least two power amplifiers (41, 42, 71, 72). The amplifiers being differently driven and they may further be part of a Chireix outphasing system or a pair of a Doherty amplifier.
A composite amplifier for use in a radio terminal of a telecommunications wireless system, comprising at least two power amplifiers that are arranged to be connected to an output combiner network and to a load, the output combiner network comprising at least one dynamically tunable reactance, and wherein said at least two power amplifiers are configured to be differently driven and wherein at least one of the impedances seen by each of said at least two power amplifiers is arranged to be dynamically tuned such that the instantaneous efficiency of the composite amplifier is increased.
A method of increasing the instantaneous efficiency of a composite amplifier comprising at least two power amplifiers being connected to an output combiner network and to a load, said output combiner network comprising at least one dynamically tunable reactance, said method comprising:
Dependencies are inferred from the claim text.