POWER AMPLIFIER WITH A PARALLEL AMPLIFICATION STAGE AND A RELATED IMPEDANCE MATCHING NETWORK, CAPABLE OF IMPROVING EFFICIENCY IN A LOW POWER OUTPUT REGION AND A HIGH POWER OUTPUT REGION

摘要

PURPOSE: A power amplifier with a parallel amplification stage and a related impedance matching network are provided to avoid overlapped power loss and complexity by excluding an additional RF switch or complex phase delay circuit.;CONSTITUTION: A first main amplifier(430-1), a third impedance matching circuit(432-1) and a fifth impedance matching circuit(434-1) form a first main amplification branch. A second main amplifier(430-2), a fourth impedance matching circuit(432-2) and a sixth impedance matching circuit(434-2) form a second main amplification branch. The first main amplification branch, the second main amplification branch and a second impedance matching circuit(424) form a main amplification stage. The main amplification stage is arranged in parallel with an impedance transformation network(440). The parallel combination of the impedance transformation network and the main amplification stage forms a second amplification stage.;COPYRIGHT KIPO 2011