THEORY UNDER AND EXPERIMENT OPTICAL FOR THE GaAs MESFET ILLUMINATION A.A. de Salles and J.R. Forrest The effects of light on the DC and RF properties of MESFETs are predicted and measured. Photovoltaic effects in the region of the metal-semiconductor Schottky gate and in the interface between the active channel and substrate or buffer layer are considered, as well as photoconductive effec

A NEW MODEL TO DEVICE FOR BREAKDOWN LIMITATIONS IN POWER MESFET's : CONTRIBUTION OPTIMIZATION R. WROBLEWSKI, G. SALMER ABSTRACT The channel avalanche breakdown in GaAs MESFET's has been investigated. It is due to the stationary high field domain which builds-up between the gate and drain. Various types of domain have been found depending on technological parameters and the gate bias. Desi

NOVEL SCHOTTKY DRAIN MEDIUM POWER GaAs MESFET Didier MEIGNANT ABSTRACT This paper describes a new method used to fabricate a submicronic recessed gate GaAs FET with Schottky drain. Preliminary DC and microwave results are presented together with the advantages of the Schottky drain. 

EXTENDED FREQUENCY RANGE GaAs MESFETs USING O.3~m GATE LENGTHS J. Arnold, R.S. Butlin* ABSTRACT The use of GaAs MESFETs, based on 0.5~m gate length technologies, is now well established up to 18 GHz. However, system requirements are demanding either lower noise performance and/or higher frequencies. This paper describes the technologies necessary to fabricate devices with 0.3~m gate lengths, t

A GaAs MSI WORD GENERATOR OPERATING AT 5 Gbit/s DATA RATE C. Liechti*, G. Baldwin*, E. Gowen*, F. Hennig*, M. Namjoo+, and A. Podell++ ABSTRACT GaAs word generator has been designed with computer aids, built, and tested for applications in commerical test instrumentation. This medium-scale-integrated circuit incorporates 600 active devices. It consists of an 8:1 parallel-to-serial data conv

A TARGET SIMULATOR FOR FREQUENCY John A. H. Wall ABSTRACT A prototype radar target for testing frequency-agile and unit is described and measured simulator using surface acoustic for coherent applications. A made. AGILE RADARS simulator is described possessing features essential coherent systems. A high speed frequency tracking performance limitations discussed. A variable range wave devices is



RADIOMETRIC TARGET SIGNATURES AT FREQUENCIES UP TO 150GHZ M. W. HOSKING ABSTRACT Microwave Technology is now well extended into the millimetre wavelength band and is leading to the evolution of sub-systems such as various types of sensor and seeker. In turn, the effective design of these sub-systems is dependant upon a good data base. This is particularly true for radiometric sensors, ing bloc

MICROWAVE EMISSION CHARACTERISTICS OF SNOW COVERED EARili SURFACES MEASURED BY THE NIMBUS-7 SATELLITE M. Tiuri, M. Hallikainen ABSTRACT The satellite Nimbus-7 is mapping the brightness temperature of the Earth surface at several microwave frequencies. Its observations can be applied to the remote sensing of snow cover. In this report the effects of different types of surfaces, such as fores

THE GLOBAL SNOW COVER SEEN BY THE NIMBUS-7 WAVE RADIOMETER (SMMR) +) S.PATIL, K.F.KUNZI, +) *) H.ROTT SCANNING MULTICHANNEL MICRO- ABSTRACT: The use of spaceborne multifrequency microwave radirnaeter data to obtain important parameters of global snow cover over land is demonstrated. With the help of an interactive image display system we have optimized the retrieval algorithms for snow extent