US 12,334,871 B2
Feedforward amplifier
Richard Hellberg, Huddinge (SE)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Appl. No. 17/800,273
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Feb. 21, 2020, PCT No. PCT/SE2020/050205
§ 371(c)(1), (2) Date Aug. 17, 2022,
PCT Pub. No. WO2021/167508, PCT Pub. Date Aug. 26, 2021.
Prior Publication US 2023/0075926 A1, Mar. 9, 2023
Int. Cl. H03F 3/21 (2006.01); H03F 1/02 (2006.01); H03F 1/32 (2006.01)
CPC H03F 1/02 (2013.01) [H03F 1/3223 (2013.01); H03F 3/211 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A feedforward amplifier for amplifying an input signal received at an input port and providing an output signal at an output port, the feedforward amplifier comprising:
at least one power amplifier configured to receive the input signal and to generate an amplified signal;
an error correcting circuitry configured to generate a first error signal and a second error signal based on an error in the amplified signal created when amplifying the input signal; and
an output circuitry comprising:
a first quadrature coupler having a first port configured to receive the amplified signal, a second port configured to generate the output signal, a third port and a fourth port; and
a first error amplifier and a second error amplifier, wherein an output of the first error amplifier is configured to be connected to the third port and an input of the first error amplifier is configured to receive the first error signal, and wherein an output of the second error amplifier is configured to be connected to the fourth port and an input of the second error amplifier is configured to receive the second error signal;
wherein the output circuitry is configured to generate an error compensation signal in the first quadrature coupler from the output signal of the first error amplifier and the output signal of second error amplifier, the error compensation signal is synchronized and in anti-phase with the error in the amplified signal.