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Semiconductors / Integrated Circuits

Gain for Compressed Amplifiers

Examination of two approaches to the concept of gain, differential and ratiometric in compressed amplifiers
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
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
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
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
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
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
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
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
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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A Portable Base Station Installation and Commissioning Test System

Introduction to a base transceiver station test system capable of providing adaptable on-site testing for the verification of transmit and receive paths of base stations
Product Feature A Portable Base Station Installation and Commissioning Test System Racal Instruments Limited Slough, UK Testing in the field puts singular rigorous demands on both the engineer and test equipment used, with the installation and commissioning of field installed base stations presenting particular challenges. Specific considerations include being...
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