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Industry News

Effect of Resistivity Variations on the Performance of Lossy Micro-machined Resonators

This article examines the effect of wafer resistivity on micro-machined resonator performance. Two similar topologies, on two wafers of different (low and high) resistivities, have been compared at X-band. The high resistivity wafer shows a 10 dB impro...
Microstrip resonators have very important applications in microwave or millimeter-wave systems. They are important components of microstrip filters, microstrip oscillators and microstrip antennas, and enable miniaturization of microwave equipment with improved performance. The performance of a microstrip resonator relies on the electromagnetic field distribution, the resonant frequency and the...
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A Highly Integrated HBT Down-converter MMIC Employing Optimally Designed Spiral Inductor Filters

In this article, a highly integrated down-converter monolithic microwave integrated circuit (MMIC), employing heterojunction bipolar transistors (HBT), is described for application to a one-chip transceiver solution for a Ku-band commercial wireless co...
Ku-band down-converter MMICs and receiver chips have been reported in the literature. 1–3 However, for one-chip transceiver applications in Ku-band, the following problems should be solved: • Ku-band commercial down-converter MMICs have been fabricated using GaAs MESFETs and HEMTs 1–3 because they can be easily integrated on one chip...
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A Distributed Trans-impedance Amplifier Using InGaP/InGaAs Enhancement-mode PHEMT Technology

A broadband trans-impedance amplifier using a 0.5 μm InGaP/InGaAs E-mode PHEMT process is reported for optical electronic communication applications. The distributed amplifier was achieved with a trans-impedance gain of 50 dB-Ω and a bandwid...
An optoelectronic device performs the transition between optical and electrical components. The trans-impedance amplifier is the most suitable preamplifier configuration in optoelectronic receivers. A block diagram of the circuit module is shown in Figure 1 . The trans-impedance amplifier is the first stage electrical amplifier in the receiver chain...
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Horn Antenna Synthesis CAD Tool

Hybrid mode horn radiators with high aperture efficiency and low cross-polarization levels are commonly used in wideband or multi-beam antennas in modern telecommunications. Such applications usually require the accurate prediction and optimization of the antenna performance parameters for both fundamental and higher order mode operation. Although various analysis tools...
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New Insights into Varying RF Phenomena with Live RF

The rapid expansion of digital RF applications has driven the measurement needs of many applications including mobile communications and spectrum management beyond the capabilities of swept spectrum and vector signal analysis. To address these new requirements, Tektronix has developed Digital Phospor Technology (DPX™) with live RF that first became...
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A Low-cost Digital Synthesizer

The conversion from analog to digital technologies, in such fields as wireless communications, music and video, has historically emerged first in the high end of their respective markets. Initial appearances of digital technology are usually seen in those applications requiring leading-edge performance. The same pattern has been emerging, albeit...
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Web Update

Fabless in Hyderabad AMTL develops standard products based on robust and reliable designs fabricated at GaAs foundries around the world. AMTL products are tested and packaged as per customer requirement at the state-of-the-art facility available with the parent company. AMTL also designs high performance MMICs for customer specific applications....
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Northrop Grumman Demonstrates New Synthetic Aperture Radar

Northrop Grumman Corp. has successfully demonstrated the capability to generate high-resolution, in-flight synthetic aperture radar (SAR) maps using the AESA (active electronically scanned array) radar being produced for the US Air Force’s F-22 Raptor fighter aircraft. “The flight tests, on board a company BAC 1-11 test bed aircraft, have...
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Harris Corp. Introduces First Multiband Radio for Federal Agencies

Harris Corp., an international communications and information technology company, introduced the first multiband land mobile radio that provides real-time interoperable communications for the growing federal public safety and homeland security market. Public safety communications interoperability has been identified by Congress, the National Governor’s Association, the US Conference of Mayors...
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