Experimental investigations of hybrid mode operation in oversized Gunn effect devices

Experimental observation of the hybrid mode of oscillation in oversized samples of bulk and epitaxial GaAs is discussed. This mode of operation is a hybrid of Gunn domain and LSA modes, and is achieved by allowing dipoles to partially form in the sample while operating at appropriate ratios of electron concentration to operating frequency (n/f) so that several such partially-formed dipoles exist simultaneously within the sample. The increase in the power × (frequency)²× impedance product in the hybrid mode over that of the ordinary domain mode appears to be significant; also, the stringent starting conditions and severe thermal problems associated with pure LSA operation are not encountered.