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Software & CAD

Gain for Compressed Amplifiers

Examination of two approaches to the concept of gain, differential and ratiometric in compressed amplifiers
May 1, 2002
Tutorial Gain for Compressed Amplifiers There is growing interest in operating amplifiers into compression to achieve higher power-conversion efficiencies. It becomes constructive then to revisit the concept of amplifier gain, because when an amplifier operates in compression the general assumption that the output signal is directly proportional to the...
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Monolithic RF Matrix Switches

Introduction to a new line of fully monolithic RF matrix switches for cellular infrastructure applications
April 1, 2002
Product Feature Monolithic RF Matrix Switches Peregrine Semiconductor Corp. San Diego, CA A new line of fully monolithic 4 x 6 RF matrix switches for cellular infrastructure applications has been introduced. The parts feature low insertion loss, very high port-to-port isolation and serial programmability. These designs represent the state-of-the-art...
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A Low Cost Oscillator for Fiber-optic Applications

Introduction to a new oscillator for use in synchronous optical network applications
April 1, 2002
Product Feature A Low Cost Oscillator for Fiber-optic Applications A new, low cost oscillator has been introduced for use in synchronous optical network (SONET/SDH) OC-192 applications. The new frequency source utilizes an ultra-low noise active device technology that allows the oscillator to achieve very low overall phase noise performance....
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Temperature Variable Attentuator for Millimeter-wave Applications

A temperature variable attenuator designed for millimeter-wave applications is featured
April 1, 2002
Cover Feature Temperature Variable Attenuator for Millimeter-wave Applications EMC Technology Inc. Cherry Hill, NJ The Thermopad® temperature variable attenuator (TVA) has gained widespread popularity among RF and microwave circuit designers as a simple solution to compensate gain variation over temperature. The TVA is a special case of the absorptive...
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Calculation and Measurement of Lock Time in a Phase-locked Loop Frequency Synthesizer

Presentation of the equations involved in predicting lock time and transient response of synthesizer phase-locked loops
April 1, 2002
Technical Features Calculation and Measurement of Lock Time in a Phase-locked Loop Frequency Synthesizer Lock Time is an Important Design Parameter Florian Krug Technische Universitaet Muenchen Muenchen, Germany Jean Wilwert Infineon Technologies Muenchen, Germany The 'Wireless World' (radio and television broadcast, cordless phones, cellular radio communication, remote controls, wireless...
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A Distributed Amplifier for 40 Gbps Fiber-optic Communications Systems

Description of a distributed amplifier for a LiNbO<sub>3</sub> modulator driver using double-doped AlGaAs/AlGaAs pseudomorphic HEMTs
April 1, 2002
Technical Feature A Distributed Amplifier for 40 Gbps Fiber-optic Communications Systems H. Shigematsu, M. Sato, T. Hirose and Y. Watanabe Fujitsu Laboratories Ltd. Atsugi, Japan In recent years, the rapid development of multimedia communications has generated a strong demand for high speed and high capacity transmission systems. Wavelength-division multiplexing...
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Design of a Predistortive High Power Amplifier Using Carrier Complex Power Series Analysis

Introduction to a new carrier complex power series for linearizing the distortion effects of a high power amplifier
April 1, 2002
Technical Feature Design of a Predistortive High Power Amplifier Using Carrier Complex Power Series Analysis In this article, a new carrier complex power series for linearizing the distortion effects of a high power amplifier (HPA) is proposed. The amplitude (AM-to-AM) and phase (AM-to-PM) nonlinear characteristics of the HPA are...
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The Use of Intermodulation Tables for Mixer Simulations

Use of intermodulation table files to accurately predict the output frequency content of an up-converting or down-converting mixer in system simulations
April 1, 2002
Technical Feature The Use of Intermodulation Tables for Mixer Simulations The use of intermodulation table (IMT) files can lead to accurate prediction of the output frequency content of an up-converting or down-converting mixer in system simulations. For best results, custom IMT files should be constructed from mixer output spectrum...
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Output Power Improvement of a Push-push FET DRO by Using an Additional DR

Measurement of the output power level and phase noise property of nine conventional push-push dielectric resonator oscillators (DRO) incorporating an additional DR
April 1, 2002
Technical Note Output Power Improvement of a Push-push FET DRO by Using an Additional DR In this article, the output power level and phase noise properties of nine conventional push-push dielectric resonator oscillators (DRO) have been experimentally investigated while adding an identical dielectric resonator (DR) at the drain ports....
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Software for Optimizing the Design and Low Cost Production of Waveguide Filters

Presentation of a newly released coupled-cavity filter software developed to allow optimized design of millimeter-wave waveguide bandpass filters
March 1, 2002
Product Feature Software for Optimizing the Design and Low Cost Production of Waveguide Filters Zeland Software Inc. Fremont, CA Because of their low loss and high power-handling capability, waveguide filters have been widely used in telecommunications and wireless communications systems. The key to gaining a competitive edge in the...
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