Epitaxial GaAs diodes have been fabricated giving 651mW CW output power at 10 GHz under room temperature operation. A dc to RF efficiency of 10.1 percent was obtained from a diode operating CW while the measured output of another diode was over 20 mW for 3 mA dc with 70-volt biasing.
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L. D. Armstrong (1968) studied this question.
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