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ISSUE DATE: NOVEMBER 2002 | |
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November 2002 - In This Issue [Cover Story] DACs Deliver Multiple Carriers Digital-to-analog converters (DACs) continue to advance according to the needs of high-performance modern communications systems. As modern systems employ more elaborate modulation and multiple-carrier formats, the demands on system components such as... — Ron Gatzke [News] Weinschel Celebrates 50 Years Of Excellence Fifty years is a long time for a company in any industry. In the microwave industry, for example, a mere handful of companies can trace their roots back one-half century, making this achievement by Weinschel Corp. (Frederick, MD) all the more... — Jack Browne [Design Features] Selecting Crystals For Stable Oscillators Oscillators are critical components in RF and digital designs. Although oscillator circuitry may already be provided as part of an integrated circuit (IC), a product-design engineer may still be required to select the crystal resonator and external... — Steven Bible [Design Features] Flexible Printed Antennas Span 100 kHz To 40 GHz Flexible circuit technologies have enabled antenna designers to speed the evolution of versatile and cost-effective solutions for a wide range of wireless applications. From contactless access cards, smart passports, RF-identification (RFID) tags... — Martin Nicholson [Design Features] Make Precise Base-Station Power Measurements Measurements of gain and phase are vital to the operation of many radio systems. At one time, this capability required complex and expensive instruments or circuitry. Fortunately, now this capability can be incorporated into wireless infrastructure... — Rick Cory , et al. [Design Features] Buffer Amplifiers Solve VCO Problems Isolation between two circuit stages is often achieved by introducing a buffer amplifier between them. This isolation minimizes adverse effects in a wide range of applications, and especially for those using RF signals. Poor output isolation can... — Mark Crandall [Design Features] Modeling 802.11a-Based WLAN Systems Multicarrier modulation schemes are gaining momentum in the communications marketplace due to bandwidth efficiency. In particular, orthogonal-frequency-division-multiplex (OFDM) systems allow carriers to be very tightly packed by maintaining strict... — Dr. Kurt Mathis [Product Technology] Oscilloscope Conquers Speed And High Bandwidth Relief has come to engineers working with very fast edges or long, complex high-speed signals. The WaveMaster model 8600A digital storage oscilloscope from LeCroy Corp. (Chestnut Ridge, NY) can capture signals up to a 6-GHz bandwidth with a 75-ps rise... — Nancy Konish [Product Technology] Broadband Amplifiers Drive OC-768 Modulators Drivers for lithium niobate (LiNO3) or electro-absorptive (EA) modulators used in OC-768 optical-communications systems must provide high-quality output signals over six decades of bandwidth, covering approximately DC to beyond 40 GHz.... — Jack Browne [Product Technology] Real-Time Processing Merges With Low Power Efficiency Model OMAP1510, which was the first OMAP processor from Texas Instruments, Inc. (TI; Dallas, TX), has evolved into somewhat of a standard for intermediate-generation (2.5G) and third-generation (3G) wireless applications. By extending that... — Nancy Konish [Product Technology] RF ICs Complement Full Device Portfolio Integrated-circuit (IC) suppliers are often known for a handful of circuit functions, such as microcontrollers or data converters. But Linear Technology Corp. (Milpitas, CA), already well-established for their power ICs, operational amplifiers, and... — Jack Browne [Editorial] Where Did All The Wireless Go? High-frequency electronics manufacturers may have been pondering that question these past two years, wondering what became of the wireless business. The industry is nearing the end of what has been a tumultuous two years, where it seemed that the... — Jack Browne |
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