Doherty power amplifier system
AssigneeQorvo US, Inc.
InventorNadim Khlat
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Abstract
A Doherty amplifier system is disclosed. The Doherty amplifier system includes a carrier amplifier having a main input for receiving a first portion of a radio frequency (RF) signal and a main output in communication with a RF signal output. A peaking amplifier has a peak input for receiving a second portion of the RF signal and a peak output in communication with the RF signal output. Further included is a first impedance inverter coupled between the main output and the peak output. A second impedance inverter is coupled between the peak output and the RF signal output. A first impedance inverter coefficient of the first impedance inverter is numerically within ±10% of a second impedance inverter coefficient of the second impedance inverter.
Claims19
A Doherty amplifier system comprising:
- a carrier amplifier having a main input for receiving a first portion of a radio frequency (RF) signal and a main output in communication with a RF signal output;
- a peaking amplifier having a peak input for receiving a second portion of the RF signal and a peak output in communication with the RF signal output;
- a first impedance inverter coupled between the main output and the peak output;
- a second impedance inverter coupled between the peak output and the RF signal output, wherein a first impedance inverter coefficient of the first impedance inverter is numerically within ±10% of a second impedance inverter of the second impedance inverter;
- and
- a controller in communication with the peaking amplifier, the controller having a first signal input, a second signal input, and a first control output, wherein the controller is configured to maintain a peak current flowing from the peak output in proportion with a main current flowing from the main output when the peaking amplifier is active by providing through the first control output a control signal that adjusts the peak current of the peaking amplifier based upon at least a first signal received at the first signal input and a second signal received at the second signal input.
Dependencies are inferred from the claim text.