Patent ID: 8749306

Claim:
An enhanced Doherty amplifier comprising: a power splitter configured to receive an input signal and split the input signal into a carrier signal provided at a carrier splitter output and a peaking signal provided at a peaking splitter output; a Doherty combining node; a carrier path comprising; carrier power amplifier circuitry; a carrier input network coupled between the carrier splitter output and the carrier power amplifier circuitry; and a carrier output network coupled with the carrier power amplifier circuitry and the Doherty combining node; and a peaking path comprising: peaking power amplifier circuitry; a peaking input network coupled between the peaking splitter output and the peaking power amplifier circuitry; and a peaking output network coupled with the peaking power amplifier circuitry and the Doherty combining node; wherein the carrier input network is configured to advance a phase of the carrier signal and the peaking input network is configured to delay a phase of the peaking signal thereby causing the peaking signal to lag the carrier signal by approximately 90 degrees when the carrier and peaking signals are respectively presented to the carrier and peaking power amplifier circuitries and the carrier and peaking output networks are configured to respectively impose compensated carrier and peaking phase offsets causing the peaking and carrier signals to arrive at the Doherty combining node for reactive combining to generate an output signal.