Doherty amplifier

A Doherty amplifier comprising:

• a main amplifier having a main input in communication with a radio frequency (RF) signal input and a main output in communication with a RF signal output;
• a peaking amplifier having a peak input in communication with the RF signal input and a peak output in communication with the RF signal output;
• main neutralization circuitry having a main neutralization input in communication with the peak input and a main neutralization output in communication with the main input, wherein the main neutralization circuitry is configured to inject a main neutralization signal into the main input such that the main neutralization signal is 180°±10% out of phase and equal in amplitude to within ±10% of a main parasitic feedback signal passed from the main output to the main input by way of a main parasitic feedback capacitance;
• and
• peak neutralization circuitry having a peak neutralization input in communication with the main input and a peak neutralization output in communication with the peak input, wherein the peak neutralization circuitry is configured to inject a peak neutralization signal into the peak input such that the peak neutralization signal is 180°±10% out of phase and equal to within ±10% in amplitude to a peak parasitic feedback signal passed from the peak output to the peak input by way of a peak parasitic feedback capacitance.