Output networks in combination with linc technique
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorThomas Lejon
Life of this patent
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Abstract
The present invention relates to balanced power amplifier network in combination with outphasing techniques such as Chireix. The object of the present invention is to provide a solution to the problem to combine balanced amplifiers like the current mode class D (CMCD) or class E/F with a LINC network. The main problem is that some power amplifiers have balanced output and the LINC network is single-ended so that a high power low loss transformer that works at several impedance levels is needed, which is hard to realize at cellular frequencies.
Claims3
A composite power amplifying system for amplifying a signal according to Linear Amplification using Nonlinear Components (LINC) or Chireix outphasing techniques, comprising:
- two balanced power amplifiers, each having two outputs, wherein a first output of the first power amplifier is connected to a first transmission line and the first output of the second power amplifier is connected to a third transmission line, and a second output of the first power amplifier is connected to a second transmission line and the second output of the second power amplifier is connected to a fourth transmission line, wherein the first and the third transmission lines are connected to a first connection point and the second and fourth transmission lines are connected to a second connection point, said first connection point is connected to a first input of a balun arrangement and the second connection point is connected to a second input of the balun arrangement, wherein one of the outputs of the balun arrangement is connected to an output load.
Dependencies are inferred from the claim text.