Patent ID: 9647611
Date: 2017-05-09
CPC Classifications: H03F

Claim:
1. A Doherty amplifier comprising: a radio frequency (RF) signal input terminal configured to receive an input RF signal; a packaged power splitter device with a power divider, a first input terminal, a second input terminal, a first output terminal, and a second output terminal, wherein the power divider includes a first port coupled to the first input terminal, a second port coupled to the second input terminal, a third port coupled to the first output terminal, a fourth port coupled to the second output terminal, and a fifth port that is configured to be coupled to a split ratio adjustment circuit, and wherein the first input terminal is coupled to the RF signal input terminal, the second input terminal is terminated, and the power divider is configured to receive the input RF signal and to produce a main RF signal at the third port of the power divider and a peaking RF signal at the fourth port of the power divider; a main amplification path coupled to the first output terminal of the power splitter device, wherein the main amplification path includes a main amplifier configured to amplify the main RF signal; a peaking amplification path coupled to the second output terminal of the power splitter device, wherein the peaking amplification path includes a peaking amplifier configured to amplify the peaking RF signal; a combiner circuit that includes a summing node and a phase delay element between an output of the main amplifier and an output of the peaking amplifier; and an RF signal output terminal coupled to the summing node.