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Mechanism Analysis of Periodicity and Weakening Surge of GaAs Photoconductive Semiconductor Switches

The periodicity and weakening surge of GaAs Photoconductive Semiconductor Switches is analyzed. We think periodicity and weakening surge of the output current waveform is caused by self-excitation of the circuit. The electric field threshold and maintenance field of Gunn threshold electric field are modulated by the AC electric field; the output waveform became two main modes of trans-electron oscillator, namely delay dipole domain mode and quenched dipole domain mode.