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Semiconductors / Integrated Circuits

A Feedforward Power Amplifier with Loops to Reduce RX Band Noise and Intermodulation Distortion

Introduction to a new power amplifier developed to reduce amplified noise and intermodulation distortion signals using a feedforward technique
January 1, 2002
Technical Feature A Feedforward Power Amplifier with Loops to Reduce RX Band Noise and Intermodulation Distortion This article proposes a new power amplifier approach for the reduction of amplified noise signals in the receiver (RX) band as well as intermodulation distortion signals in the transmitter (TX) band using a...
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Topics in Communication System Design: Carrier Triple Beats

Analysis of carrier triple beats that create third-order intermodulation interference when two or more carriers are present in one channel
January 1, 2002
Technical Feature Topics in Communication System Design: Carrier Triple Beats Howard Hausman Miteq Inc. Hauppauge, NY Intermodulation interference is typically calculated based on two signals present in the RF or IF bandwidth. When the bandwidth is less than an octave, even-order intermodulation products, such as second- and fourth-order intermodulation...
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Stainless Steel Coaxial Cable with Medium Loss at 36 GHz

Development of a high performance stainless steel coaxial cable with medium loss at 36 GHz
December 1, 2001
Product Feature Stainless Steel Coaxial Cable with Medium Loss at 36 GHz Fig. 1 Loss per 100 ft. vs. frequency. Anyone who has tried to use copper cable for high frequency connections in high stress environments knows that it does not hold up very well for long. Attempts to...
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A Broadband, Four-bit, Ka-band MMIC Phase Shifter

Introduction to the design, fabrication and measurement of a broadband, four-bit, GaAs phase shifter at Ka-band frequencies
December 1, 2001
Technical Feature A Broadband, Four-bit, Ka-band MMIC Phase Shifter A compact, robust and broadband, four-bit, Ka-band phase shifter was designed and fabricated in a standard 0.25 m m PHEMT GaAs process. Design trade-offs, simulation versus measured results and architectures for the various bits to achieve broadband performance are discussed....
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Optimum Design for Linearity and Efficiency of a Microwave Doherty Amplifier Using a New Load Matching Technique

Presentation of a new design technique to match the complex load impedance of a Doherty amplifier for various power levels using offset transmission lines at the load modulation network
December 1, 2001
Technical Feature Optimum Design for Linearity and Efficiency of a Microwave Doherty Amplifier Using a New Load Matching Technique A Doherty amplifier with full load matching circuits of the carrier and peaking amplifiers at both low and high power levels is demonstrated for the first time. In the circuit...
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A High Efficiency, Low Cost Silicon Bipolar GSM Dual-band PA Module

Presentation of the design and measurement data for a PA module using silicon RF-IC bipolar chip technology on a simple ceramic substrate
December 1, 2001
Technical Feature A High Efficiency, Low Cost Silicon Bipolar GSM Dual-band PA Module T. Johansson, P. Lundin, J. Engvall and D. Uggla Ericsson Microelectronics AB Kista, Sweden U. Hagström Ericsson Microwave Systems AB Mölndal, Sweden As the wireless communication business continues to expand, there is great demand for reducing...
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Electronically Tunable Thin Film Filters for Microwave Applications

A new line of electronically tunable RF filters is featured
November 1, 2001
Cover Story Electronically Tunable Thin Film Filters for Microwave Applications Paratek Microwave Inc. Columbia, MD Interference in wireless systems increases bit error rate (BER) and decreases the reliability and quality of service of the communication network. Interference mitigation requires filtering of the transmitted and received energies to reject all...
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Dual Mode Broadband Hybrids: Theory and Experiment

Development of a theoretical approach to the control and optimization of the major parameters of side and top wall hybrid couplers
November 1, 2001
Technical Feature Dual Mode Broadband Hybrids: Theory and Experiment Alex D. Lapidus Microwave Communications Company International Inc. Valencia, CA A theoretical approach to both side and top wall (hybrid) couplers based on strong experimental work is developed. Broadband operation, related to dual mode propagation through the coupling section, is...
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Implementation of a Neural Network HEMT Model into ADS

An approach for implementing a neural network algorithm to develop a large-signal HEMT model into ADS
November 1, 2001
Technical Feature Implementation of a Neural Network HEMT Model into ADS Neural network algorithms have been applied to various areas of engineering and computer science. A high electron-mobility transistor (HEMT) large-signal model has been implemented in the Advanced Design System (ADS) software package using a multilayered neural network. The...
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A Broadband Planar Isolator Using Coupled Microstrip Lines on a Magnetized Gyrotropic Substrate

Introduction to a new type of broadband isolator using nonreciprocal coupling between two microstrip lines fabricated on a magnetized gyrotropic substrate
November 1, 2001
Technical Feature A Broadband Planar Isolator Using Coupled Microstrip Lines on a Magnetized Gyrotropic Substrate A new type of broadband isolator, using coupled microstrip lines on a transversely magnetized gyrotropic substrate, is proposed in this article. The nonreciprocal coupling between two microstrip lines can be used to create an...
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