MiBS IF COMBINER FOR SPACE AND ANGLE DIVERSITY IN DIGITAL RADIO: FIRST TRIAL RESULTS. U. Casiraghi .. .. A Conti R. Nobili .. P. Troyer . ABSfRAcr The performance of a minimum Bit Error Strategy (MiBS) combiner operating at intermediate frequency (IF) is described. A considerable reduction in system outage compared with the traditional strategies for digital radio transmission using space

HIGH OUTPUT DISTORTION PORT ISOLATION MULTI-PORT-AMPLIFIER AND LOW INTERMODULATION Kazuichi YAMAMOTO* and Masayoshi TANAKA* ABSTRACT The multi-port-amplifier (MPA) is an innovative on-board power amplifier for multi-beam mobile satellite communications because it enables the efficient use of DC power and the flexible allocation of RF power. It is important for the multi-beam mobile satellite co

'HIGH EFFICIENCY, LINEARIZED POWER AMPLIFIER FOR COMMUNICATION A. DARBANDI SATELLITES -W. ZOCCARATO Abstract A high efficiency, very linear payload is being described. multicarrier signal operation power ratio (NPR) for this high power solid-state amplifier for mobile communication satellite The amplifier provides an output power in excess of 9 W for a with an associated dc-to-rf efficiency grea

Power Amplifier Adaptive Linearization Using Predistortion with Polynomial Functions Mohammad Ghaderi., Surinder Kumar. ABSTRACT Quadrature amplitude modulation has high spectral efficiency but is highly sensitive to power amplifier nonlinearities. It is shown that an adaptive predistorter using polynomial amplitude and phase predistortion functions can be used to linearize the power amplifier. T

A LARGE-SIGNAL EQUIVALENT HYPERABRUPT P-N JUNCTION CIRCUIT MODEL FOR V ARACTOR DIODES Vicentiu I. Cojocaru* and Thomas J. Brazil* ABSTRACT A large-signal equivalent circuit model is presented for a hyperabrupt p-n junction varactor diode (HJVD), suitable for nonlinear CAD and computer simulation. A new function is proposed to describe the nonlinear dependence of the junction capacitance on the

BLACK-BOx MODELLING OF NONLINEAR DEVICES FOR FREQUENCY-DOMAIN ANALYSIS Tapani Nfu"hi * ABSTRACT A large-signal black-box model for nonlinear microwave devices is presented. The model is directly constructed from measured small-signal s-parameters and DC characteristic curves of the device without complicated parameter extraction procedures. Separate determination of device parasitics is not

AN ADVANCED SIMULATION EMPIRICAL MESFET MODEL FOR USE IN NONLINEAR Vittorio RIZZOLI (1), Alessandra COSTANZO (1), Andrea NERI (2) ABSTRACT The paper discusses the mathematical formulation and the parameter extraction mechanism for a new largesignal MESFET model suitable for application in nonlinear CAD. All nonlinear components of the equivalent circuit are related to the state variables by s

FREQUENCY.DOMAIN ANALYSIS OF ELECTRICALLY NONLINEAR MICROWAVE CIRCUITS AND THERMALLY Vittorio RIZZOLI (1), Claudio CECCHETII (2), Franco MASTRI (3), Alessandro LIPPARINI (1), Valeria FRONTINI (4), Fiorella SGALLARI (5) ABSTRACT The simulation of temperature-dependent microwave circuits under large-signal multitone excitation is reduced to the simultaneous solution of two coupled nonlinear circui

A UNIFIED CONSISTENT DC TO RF LARGE SIGNAL FET MODEL COVERING THE STRONG DISPERSION EFFECTS OF HEMT DEVICES A. Werthof, G. Kompa* ABSTRACT A large signal FET model is presented which is valid for DC, small signal and nonlinear operation over the whole range of bias conditions. Novel features of the proposed approach include the consideration of dispersion in transconductance and channel conductanc

COMPARATIVE STUDY OF MONOLITHIC MICROSTRIP LINES FOR ELECTROOPTIC LIGHT MODULATORS M. MABROUK* & S. TEDJINI* AND COPLANAR STRIPS ABSTRACT: In this communication, double heterostructure GaAs/GaAIAs MMIC microstrip and coplanar strips structures are studied over the 2-18 GHz band, for their use as travelling wave electrooptic modulators. The obtained theoretical and experimental results show that