The dynamic characteristics of GaN-based Gunn and IMPATTs are reported at same operating conditions to find out the potentiality of each device to use as high frequency signal generator. The general model is developed by the author’s group considering all the physical phenomena for both the devices. It is seen that Double Drift Region IMPATTs produce better microwave power compare to Gunn diode...

Intervalley scattering of hot electrons during high-field transport in transverse-field photorefractive quantum wells induces a nonlocal optical response in which photoinduced changes in the refractive index are spatially shifted relative to the optical stimulus, providing an avenue for optical gain. We demonstrate that the onset of the photorefractive phase shift coincides with the onset of ve...

A current controlled bistable switching element using a CW Gunn diode is reported. With modest circuits switching rates of the order of 10 MHz have been obtained. Switching is initiated by current pulses of short duration (5 10 ns). Rise times of the order of several nanoseconds could be obtained. The apparent mechanism which allows the bistable operation of the Gunn diode is the reduction in t...

Several abnormal synkinetic eye movements during jaw movements may often be seen after trauma or congenitally in the Marcus Gunn jaw winking phenomenon. The most frequent type consists of unilateral ptosis and retraction of the ptotic lid upon moving the jaw. The authors describe a case with isolated simultaneous adduction of the left eye upon jaw movement. This paper presents a rare case of Ma...

Pledging went slowly at fraternities and independent living groups on the first day, but picked up slightly in the late afternoon. By midnight Wednesday morning, 233 freshmen had pledged fraternities and ILGs, said Interfraternity Council Membership Recruitment Chair Dakus S. Gunn ’01. About one-half of an estimated 350 bids were accepted by 4 p.m. yesterday, according to reports from residenti...

This paper represents a novel second harmonic power combining oscillator using mutually synchronized Gunn diodes embedded on slot line resonators. A both-sided MIC technology is adopted in the oscillator. The oscillator consists of Gunn diodes, slot line resonators and microstrip lines. By embedding Gunn diodes on slot line resonators, desired harmonic RF signal can be generated very easily. Th...