| | Feed-forward microwave power amplifier with difference signal distortion cancellation circuit - Patent 4629996 |
 | | A microwave power amplifier according to claim 1, wherein said adjusting means comprises a directional coupler and an attenuator for providing said signal having said level S.sub.1 from an output of said first amplifier means, and an auxiliary amplifier means for providing said signal having said level S.sub.2 from an output of said divider means. |
 | | When a number of signals are transmitted by a single power amplifier, an undesirable intermodulaton occurs due to the non-linear characteristics of the power amplifier which operates close to the saturation output power level, and so, the ratio of the desired signal power to the undersired power is decreased. |
 | | The prior feed forward system has still a further disadvantage that a trouble of a main amplifier makes the system transmitting power one fourth, and if the auxiliary amplifier output power is the same as that of the main amplifier, the system operation becomes too difficult to maintain the communication link. |
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