EVALUATION OF NON-LINEAR FUNCTIONAL EQUIVALENT CIRCUIT MODELS FOR A DESIGN GAAS MESFET, AND THEIR APPLICATION TO OPTIMUM POWER AMPLIFIER T. J. Brazil* ABSTRACT Three different for the GaAs MESFET, parameter system. A added-power conditions power amplifier, and time-domain analysis non-linear equivalent circuit models are developed based on V-parameters, S-parameters, and a hybrid comparis

LARGE Vincent SIGNAL MODELING AND ANALYSIS Itoh* OF GAAS MESFET D. Hwang and Tatsuo ABSTRACT For the first time. the modified mul tiple reflection technique is used for simulation of large signal performance of MESFET. The circuit elements and parameters are extracted with relatively small effort by systematically measuring the device S-parameters and DC current-voltage characteristics. Th

A FAST FREQUENCY SYNTHESIZER FOR MICROWAVE RADIO G. Kolumban * ABSTRACT The exact system equations of the sampled PLL's using one or two sample-and-hold circuits are given. The model takes into account the characteristics of the realizable sampler circuits. By formulating the system equations as a fixed-point problem the behaviour of the loops is studied rigorously correctly from mathematical po

A NEW METHOD TO PREVENT SPURIOUS OSCILLATIONS IN COUPLED CAVITY TWT's G. Busacca, V. Meli, M. Spalla ABSTRACT SelfPower and drive Travelling induced oscillations Wave Tube Amplifiers are prevented in Coupled Cavity (TWTA' s) by introducing frequency dependent R.F. losses at the upper cutoff. This paper describes a new method to realize the requested lossed by means of the cutoff propert

LOW NOISE MICROWAVE INTEGRATED RECEIVER FOR 64 QAM DIGITAL RADIO A. Giavarini/F. Marconi * ABSTRACT 64 QAMdigital radio requires a very high linear operation not only in the transmitter section, but also in the receiver. The paper presents a low noise microwave integrated receiver able to cover each CCIR radio frequencies band from 4 to 11 GHz with the linearity performances required for 64 Q

Multiband frequency overmoded diversity waveguide for high capacity digital radio links using C. stager, B. Eicher, W. Bolinger ABSTRACT A new design allows the use of one single waveguide run to carry 4 and 11 GHz radio link signals simultaneously. High performance diplexers are used at both ends of the waveguide run. Mode suppression allows to use the H10 mode for both frequencies.

HIGH BROAD LINEARITY UPCONVERTER FREQUENCY WITH ULTRA RADIO LOW DISTORTION OVER A LINKS BAND FOR DIGITAL Wolfgang Schiller* ABSTRACT Micro-Computer Controlled Mixer (MCCM) will be the keyword for the next generation of highly linear, very low distortion, and, in spite of these contradictory terms, broadband single-sideband upconverters. These components can be used for 64-QAM and 256-QAM m

A 94 GHZ HIGH POWER LOW LOSS JUNCTION CIRCULATOR G. FORTERRE, E. LAROCHE ABSTRACT In this paper, using the design of a high power W Band junction hexagonal ferrites is described. circulator monocristalline 

A HIGH POWER MILLIMETER PASSIVE SOLID STATE LIMITER* A. Armstrong, ABSTRACT J. Goodr1ch . and W. Moroney ** The design of an array of limiter diodes arranged in series/parallel configuration to form an RF activated control window has enhanced significantly the performance of solid state control components. A monolithic element is formed using high resistivity silicon and fabricated in a beam lea

DIELECTRIC RESONATOR BANDPASS FILTERS FOR MILLIMETRE WAVE APPLICATIONS Wolfgang Holpp* ABSTRACT This paper describes a new bandpass filter for W-band using cylindrical dielectric resonators. With ceramic materials recently available, dielectric resonators become fit for use being a weighty alternative to waveguide cavities or planar microstrip devices even in the millimetre range. Titanium wit