Abstract
Photoeffects in common-source and common-drain mode GaAs MESFET oscillators show that the common-source mode oscillator has an optical-frequency sensitivity approx. 5 times higher than that of the common-drain mode, principally caused by the oscillator frequency dependence upon C gs . Although the photoinduced frequency change can be duplicated by a small decrease (0.2–0.6 V) in gate bias voltage, 1 MHz capacitance data indicates that a change in the effective space charge density in the gate depletion layer (not a change in built-in voltage) is the source of the C gs variation.
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