COMPUTER MODELING OF SOME SOLID STATE DEVICES M.D. Profirescu+, H. Moarcas, O. Marinescu, M. Mateescu, G. Mateescu, G. Antonoiu ABSTRACT A. Stanculescu, The paper presents a set of flexible computer programs for the modeling of bipolar and MOS devices with one or two dimensions, in steady state or dtnamic regime. The numerical treatment allows for the exact solution of the set of nonlinear part

PERFORMANCE ANALYSIS OF DUAL-GATE MESFET MIXERS OSMAN LOTFY EL-SAYED* ABSTRACT Starting from the "cascode" model of the dual gate microwave an analysis of its performance as a mixer is carried. In this app- MESFET roach, the modulation of the transconductance of the second FET as well as the "drain" resistance of the first FET by the local oscillator voltage are taken into consideration. The

MEASUREMENT ZERO CURRENT F. OF THE EXTRINSIC CONDITIONS SERIES ELEMENTS OF A MICROWAVE MESFET UNDER Diamand, M. Laviron ABSTRACT A new measurement method of the parasitic series impedances a microwave MESFET is presented. The basic point of the method the MESFET is polarized under zero drain voltage, resulting in analytical model. Comparison with experiment is discussed. of is that a simp

3600 CONTINUOUSLY VARIABLE PHASE SHIFTER G. CACHIER - Y. MANCUSO ABSTRACT This analog X-band phase shifter is made up of four variable gain amplifiers combined in parallel, and respectively in phase quadrature. The association of these amplifiers is equivalent to a sum of vectors in the complex plan; by controlling the amplitudes of these vectors, the phase of the output signal can be controll

A HIGH POWER GaAs FET FREQUENCY MULTIPLIER RADIO APPLICATION TAO CHOW, PHILIP AT C-BAND FOR MICROWAVE T. CHEN AND CHI C. HSIEH ABSTRACT This paper describes a C-band GaAs FET frequency doubler with 2 dB of multiplication gain at an output level of 1 Watt. The result clearly demonstrated the advantage of using a power GaAs FET over the conventional step recovery diode. The circuit design and dep

COMPUTER AIDED DESIGN OF GaAs MESFET POWER AMPLIFIERS Carlo Naldi * Fabio Filicori ** ABSTRACT Computer microwave to the of This the algorithm the GaAs large is aided MESFET computer proposed design power time in techniques amplifiers, necessary every based is which for on for are non linear too I L:ear for circuits, time analysis. the such A as due new in actually each non expensive mi

THE CHOICE CALIBRATION OF SLIDING LOAD POSITIONS TO IMPROVE NETWORK ANALYSER H.C. Heyker ABSTRACT Using a sliding load for the calibration of a network analyser a wrong choice of sliding load positions can cause an incorrect calibration and lead to errors in the corrected measurements of an unknown reflection coefficient. The frequency dependence and error sensitivity have been studied fo

NETWORK ANALYSIS BY A DIGITAL PHASE SAMPLING TECHNIQUE OLAF OSTWALD and BURKHARD SCHIEK ABSTRACT A network analyzer method is presented which is based on detection principle. The radio frequency part of the system one source, two balanced mixers, and a phase modulator. The lation function must exceed 2TI, but is otherwise completely because a digital signal processing is employed. This

ENERGY ABSORPTION ELECTROMAGNETIC P. Bernardio, IN SUBJECTS EXPOSED TO TRANSIENT FIELDS A. D'AmatoO, G. D'Inzeooo ABSTRACT The determination of energy absorption in subjects exposed to transient electromagnetic fields is important to evaluate the possible biological effects and to quantify the exposure limits. This work analyses a model that permits to determine with good precision the field ab

SURGICAL MICROWAVE ANTENNA FOR ENDOSCOPIC PROCEDURES Lundquist,S.Bj6rn * and Roos, Dan ** ABSTRACT An invasive 2.45 GHz antenna for surgical applications has been developed. Its efficiency for controlled heating to depths between 3 and 6 nun has been demonstrated in phantom material and animal experimental investigations. The primary therapeutic goal is the palliative treatment 'of infi