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Software & CAD

Finite Element Determination of the Intrinsic Small-signal Equivalent Circuit of MESFETs

Description of a theoretical procedure used to calculate the intrinsic elements of a FET small-signal equivalent circuit
August 1, 2001
TECHNICAL FEATURE Finite Element Determination of the Intrinsic Small-signal Equivalent Circuit of MESFETs The finite element time domain method is used to determine the intrinsic elements of a broadband, small-signal equivalent circuit (SSEC) of FETs. The values of the different elements are calculated from the Y parameters of the...
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A Method of Measuring Large-signal S-parameters of High Power Transistors

Determination of large-signal scattering parameters of high power transistors from measured data during normal operation
August 1, 2001
TECHNICAL FEATURE A Method of Measuring Large-signal S-parameters of High Power Transistors A measurement method for scattering parameters (S-parameters) of high power transistors is presented. The proposed method directly determines the S-parameters of high power transistors by measuring overall gain, phase and S-parameters of input and output matching network...
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Design of a Planar Microstrip Balun at S-band

Design, simulation and measured results of a planar microstrip balun at S-band
August 1, 2001
TECHNICAL FEATURE Design of a Planar Microstrip Balun at S-band An innovation for the Marchand balun model is presented. The structure of the designed planar microstrip matching circuit is fairly simple, practical and easily fabricated without requiring complex multiple metal or dielectric layers. Moreover, the designed balun performs well....
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Using APLAC to Simulate an RFIC Mixer

Use of the APLAC Design Suite to simulate integrated mixer circuitry
July 1, 2001
PRODUCT FEATURE ="BANNER"> Using APLAC to Simulate an RFIC Mixer APLAC Solutions Inc. Irving, TX Mixers are important RF elements in modern communication devices. As the size of devices is reduced, RF integration is increased. Using the APLAC Design Suite, integrated mixer circuitry can be simulated using the RFIC...
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* Two Novel Radar Vehicle Detectors for the Replacement of a Conventional Loop Detector

Introduction to intrusive and non-intrusive radar vehicle detectors developed at 24 GHz
July 1, 2001
TECHNICAL FEATURE Two Novel Radar Vehicle Detectors for the Replacement of a Conventional Loop Detector In this article, intrusive and non-intrusive radar vehicle detectors, compatible with existing inductive loop detectors (ILD) without any modification of the communication algorithm, have been developed at 24 GHz. The intrusive detector is based...
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A Ka-band Planar Printed Antipodal Linearly-tapered Slot Antenna

Measurement, fabrication and design of a 27 to 32 GHz Ka-band planar antipodal linearly-tapered slot antenna
July 1, 2001
TECHNICAL FEATURE A Ka-band Planar Printed Antipodal Linearly-tapered Slot Antenna A Ka-band (27 to 32 GHz) planar antipodal linearly-tapered slot antenna (ALTSA) is designed, fabricated and measured. The numerical simulation was performed by 3D finite-element method (FEM). The printed ALTSA has been realized by using an RT/Duroid printed circuit...
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Adaptive Feedforward Amplifier Linearizer Using Analog Circuitry

Description of a typical feedforward architecture along with the simulation results of a compensation technique using the least mean square algorithm
July 1, 2001
TECHNICAL FEATURE Adaptive Feedforward Amplifier Linearizer Using Analog Circuitry Alfonso J. Zozaya, Eduard Bertran Albertí and Jordi Berenguer-Sau Dept. of Signal Theory and Communications Polytechnic University of Catalonia Barcelona, Spain Nowadays, feedforward is the most effective and broadly used linearization technique employed in modern multi-carrier communications systems. Different versions,...
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MEMS for RF/Microwave Wireless Applications: The Next Wave ­ Part II

Description of the possibilities afforded by MEMS in system integration and novel architectures
July 1, 2001
TUTORIAL MEMS for RF/Microwave Wireless Applications: The Next Wave ­ Part II Microelectromechanical systems (MEMS) technology is on the verge of revolutionizing RF and microwave applications.1 The requirements of present day and future RF and microwave systems for lower weight, volume, power consumption and cost with increased functionality, frequency...
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High Speed Analysis and Optimization of Waveguide Bandpass Filter Structures Using Simple Neural Architectures

Presentation of a simple and accurate neural architecture to facilitate the design of waveguide bandpass filter stuctures
June 1, 2001
TECHNICAL FEATURE High Speed Analysis and Optimization of Waveguide Bandpass Filter Structures Using Simple Neural Architectures At microwave frequencies, from about 7 to 60 GHz, inductive irises are very often used as coupling networks between half-wavelength cavities in rectangular waveguides to develop very selective low loss bandpass filters. This...
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Power Efficient MMIC Frequency Triplers

Presentation of an approach to optimize the power efficiency of an MMIC frequency tripler
June 1, 2001
TECHNICAL FEATURE Power Efficient MMIC Frequency Triplers The design of an efficient frequency tripler for an S-/X-band communications receiver is described. An approach for optimizing the tripler for best power efficiency is presented. The tripler topology consists of the harmonic generator circuit, a bandpass filter and an amplifier. A...
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