High efficiency linear power amplifier of plural frequency bands and high efficiency power amplifier

摘要: The invention presents a high efficiency linear power amplifier of plural frequency bands reduced in the number of parts and elements, simplified circuit construction, saved circuit space, FIG. 1, signals entering from common input terminal 1 in frequency A B are matched both bands A wide band matching network 2, amplified in a pre-amplifier 3, put into 4a switch circuit 4, signal is into a changeover 4b, network 5 post-amplifier 6, its output is matched post-matching 7 sent out an output 8, while, similarly, other 4c of switch 9, amplified 10, matched in 11 an outputs terminal 12. also power amplifier capable of maintaining similar characteristic if lowered of maximum efficiency, FIG. first second power amplifiers 113, 114 disposed parallel, a necessary number amplifiers connected depending on required by circuits 115 to 118, source turned only the connected amplifiers, while off, therefore lowering portion power, current consumption decreases proportion, so that equivalent high efficiency operation same as case maximum efficiency realized.