US 12,308,799 B2
Power amplifier arrangement comprising Ruthroff transformer
Mingquan Bao, Västra Frölunda (SE); and Sven Mattisson, Lomma (SE)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Appl. No. 17/626,418
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Jul. 11, 2019, PCT No. PCT/SE2019/050688
§ 371(c)(1), (2) Date Jan. 11, 2022,
PCT Pub. No. WO2021/006782, PCT Pub. Date Jan. 14, 2021.
Prior Publication US 2022/0321061 A1, Oct. 6, 2022
Int. Cl. H03F 1/07 (2006.01); H03F 1/02 (2006.01); H03F 3/24 (2006.01)
CPC H03F 1/0288 (2013.01) [H03F 3/245 (2013.01); H03F 2200/451 (2013.01); H03F 2200/541 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A power amplifier arrangement for amplifying an input power signal (Pin) to an output power signal (Pout), the power amplifier arrangement comprising:
a main amplifier having an input and an output;
at least one auxiliary amplifier, each having an input and an output;
a power divider having an input and outputs, wherein the input of the power divider is configured to receive the input power signal (Pin), and wherein each output of the power divider is connected to a respective input of the main amplifier and the at least one auxiliary amplifier; and
a Doherty combiner comprising at least one Ruthroff transformer and configured to combine all the outputs of the main amplifier and the at least one auxiliary amplifier to, at an output of the Doherty combiner, produce the output power signal (Pout), wherein one of the at least one Ruthroff transformer is configured to provide an upward impedance transformation.