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Industry News

Trend is for ZigBee Solutions “In a Box”

Opportunities for the emerging 802.15.4 Wireless PAN (WPAN) technology, and the imminent ZigBee network layer, look promising according to In-Stat/MDR. Using an aggressive scenario, annual shipments will surpass 150 million units in 2008. And, based upon discussions with system providers, the high tech market research firm believes that the...
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Despite Lack of Standard, UWB Consumer Products to Hit Retail in 2005

Being the wireless technology that can deliver the bandwidth and QoS that many consumer electronics companies have been looking for, Ultra-wideband (UWB) presents attractive opportunities, primarily for fast video transfer between peripheral devices, such as digital camcorders, TVs and PCs, and between set top boxes and TV monitors. In-Stat/MDR...
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The Book End

Microwave Ring Circuits and Related Structures Second Edition Kai Chang and Lung-Hwa Hsieh Wiley Interscience 377 pages; $125 ISBN: 0-471-44474-X Ring resonators have been used extensively in microwave circuits such as filters, oscillators, mixers, couplers, power dividers/combiners, antennas and frequency selective surfaces. They are also useful in various techniques...
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Lockheed Martin Deploys First Satellite Supporting Space-based GPS

A satellite that will enable future air navigation enhancements has been deployed by Lockheed Martin. The payload is the first use of the GPS L5 civil navigation frequency for the Federal Aviation Administration (FAA), and supports a move toward satellite-based navigation to make air traffic management safer, more reliable...
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A Ceramic Resonator Technology for 200 to 500 Percent Q Improvement

A new family of patent-pending high Q ceramic resonators has been introduced that sets a new standard for Q and ease of circuit integration for chip and wire, or SMT assemblies. The technology is ideally suited to the stabilization of microwave oscillators and VCOs, and low loss narrow band...
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High Voltage HBTs for 3G W-CDMA Base Station Power Amplifiers

A new high voltage, high power InGaP HBT discrete device has been developed that can significantly improve the efficiency of power amplifiers (PA) in cellular base stations. This new technology provides superior performance compared to silicon LDMOS. A 30-watt device driven by a predistorted W-CDMA signal has demonstrated 45...
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Design Software for Virtual Prototyping of RF and Microwave Devices

The use of simulation software is becoming an essential part of the design cycle of any new device, and has allowed the concept of “virtual prototyping” to become commonplace. Not only does this provide engineers with the ability to test new ideas before building prototypes, it also allows for...
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Thin Film Electronically Tunable Pre-selectors for Software Defined Radios

A multi-band, multi-waveform software defined radio (SDR) that provides programmable and re-configurable communications is at the core of ad-hoc networks, and ad-hoc networks are key to the transformational needs of the military (manned and unmanned). To meet interoperability requirements and mitigate co-site interference issues of a multi-band, multi-waveform architecture,...
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5.7 GHz 0.25 μm CMOS RF Front-end Circuits for an IEEE 802.11a WLAN Receiver

A 5.7 GHz 0.25 mm CMOS RF front-end, including a CMOS differential LNA and a CMOS Gilbert-cell mixer, for an 802.11a WLAN receiver is presented. The differential LNA, fabricated with the 0.25 mm 1P5M standard CMOS process, utilizes a current-reuse tech...
Due to the growing demand for broadband wireless communications, the operating frequency is moving toward the 5 GHz U-NII band. The advantage of combining the baseband circuitry and the RF front-end on one single chip for cost savings is strongly desired for highly integrated system-on-chip (SoC) applications. Due to...
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Design of a Predistortion HPA Using a Frequency Up-conversion Mixing Operation

In this article, a new predistortion linearizing method using the frequency up-conversion operation of a microwave mixer is proposed. This linearizing method does not require any additional signal source in spite of the frequency up-conversion mixing o...
Mobile communication systems currently use linear modulation schemes for effective usage of the frequency spectrum resource. Signals that use linear modulation schemes, however, such as QPSK, and 16- and 64-QAM, have a high peak-to-average power ratio and the signal envelope is changed severely. Therefore, modern mobile communication systems require...
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