Doherty Amplifier Circuit for Load-Impedance Stable Output Power

The amplification circuit is divided into two independent Doherty amplification circuits, each with its own carrier amplifier, peak amplifier, phase shifter, and synthesis circuit. This segmentation isolates the load impedance variation effects, so that variations in one circuit do not directly affect the other, thereby maintaining overall output stability while achieving high output power through parallel operation.

The invention introduces phase shifters that can adjust the phase of output signals from carrier amplifiers, and synthesis circuits that combine multiple amplified signals with controlled phases. By dynamically adjusting phase parameters and combining signals constructively, the circuit maintains stable output characteristics despite load impedance variations, while achieving enhanced output power through coherent signal combination.

By dividing the amplification function into two separate Doherty circuits, each circuit can independently adapt to load conditions through its own feedback and impedance matching mechanisms. This segmentation allows the system to maintain stability across a wider range of load impedances, as the independent circuits can compensate for variations without affecting each other's operation.

The synthesis circuits are designed to combine multiple signals with different phases and amplitudes, making them universally applicable to various load conditions. The phase shifters provide additional flexibility to adjust signal parameters, enabling the amplification circuit to adapt to different load impedances while maintaining stable output power through constructive signal combination.