Accession Number : ADA192692
Title : A Planar IC-Compatible Transferred Electron Device for Millimeter-Wave Operation.
Descriptive Note : Interim rept. no. 4, 1 Sep 87-29 Feb 88,
Corporate Author : JOHANNES KEPLER UNIV LINZ (AUSTRIA) MICROELECTRONICS INST
Personal Author(s) : Thim, Hartwig W
PDF Url : ADA192692
Report Date : 23 Mar 1988
Pagination or Media Count : 8
Abstract : Devices with 0.5 micrometers long gates have been fabricated using E beam lithography. Since no improvement in efficiency has been obtained it is recommended to use 1-1.5 micrometers long gates which are easy to fabricate. It was also found that finger gate devices exhibit ten times smaller efficiencies (0.1%) than overlapping gate devices do. In order to produce gain at a desired frequency (lambda/2 + delta)-lines terminated by radial stubs must be connected to both gate and source. Maximum gain occurs at that frequency at which the capacitive reactances of the lines with 0deltalambda/4 compensate for lead and other parasitic inductances. The device breaks into oscillations when a dielectric resonator with its resonance frequency near the maximum gain frequency is placed near both drain and gate bonding pads. The oscillator frequency can be tuned over a few hundred megahertz by varying the gate voltage by approximately 10%. An unexpectedly steep (12db/octave) fall off of efficiency with frequency has been observed whose origin has not yet been identified. It is speculated that the low field region near the drain contact might cause this steep fall off. Future devices therefore will be made with reduced gate drain distance. That might perhaps enhance efficiency in general.
Descriptors : *GATES(CIRCUITS), *LITHOGRAPHY, DIELECTRICS, EFFICIENCY, FINGERS, FREQUENCY, GAIN, HIGH FREQUENCY, INDUCTANCE, MILLIMETER WAVES, OPERATION, OSCILLATION, OSCILLATORS, RANGE(DISTANCE), REDUCTION, RESONANT FREQUENCY, RESONATORS, VOLTAGE, AUSTRIA, ELECTRON BEAMS, LEAKAGE(ELECTRICAL), MILLIMETER WAVES, INTEGRATED CIRCUITS, ELECTRON TRANSFER
Subject Categories : Electrical and Electronic Equipment
Mfg & Industrial Eng & Control of Product Sys
Distribution Statement : APPROVED FOR PUBLIC RELEASE