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ISSUE DATE: SEPTEMBER 2004 | |
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September 2004 - In This Issue [Cover Story] Modulators Direct Linear Gain And Phase Modulators make wireless transmissions possible. Whether in fixed wireless links, wireless local loops (WLLs), or current and next-generation cellular systems, modulators enable the complex modulation formats that support modern, high-data-rate... — Jack Browne [News] ATE System Speeds Avionics Testing Complex avionics and microwave instrumentation systems serve critical roles aboard Boeing Army Rotorcraft Systems' CH-47 and MH-47 Chinooks, MV-22 and CV-22 Osprey tiltrotor aircraft, and RAH-66 Comanche armed reconnaissance helicopters. The... — Jack Browne [Design Features] Modulation Choices For Telemetry Transmitters Designing a transmitter for telemetry applications requires careful consideration of the modulation scheme. For one such system, a weather-balloon telemetry transmitter was required to send digital data at 384 b/s (48 B) from the output of multiple... — Dr. Tufik Buzid [Design Features] Approach Increases Amplifier Gain Amplifier performance can be enhanced by understanding the electrical requirements of the active device, the transistor. As was seen last month in the second part of this article series, adding the appropriate stabilizing circuitry can make a... — Joseph F. White [Design Features] Examine The Effects Of Random Noise On Jitter Timing jitter and noise are among the least understood engineering concepts, yet they are among the most critical parameters in analog and digital designs. Especially in high-speed communications systems, poor jitter performance can cause increased... — Steve Lee , et al. [Design Features] High-Speed Logamps Precisely Detect Power Transmitters require circuitry to measure and control RF power for proper operation. Since system requirements vary widely, a power-control circuit may be as simple as a low-dynamic-range diode detector. The whole purpose for this device is to... — Eamon Nash [Product Technology] Palm-Sized Analyzer Surveys 6 GHz Spectrum analysis normally requires a heavy, rack-mount receiver with built-in filters, attenuators, and monitoring capabilities. The model FSH6 spectrum analyzer from Rohde & Schwarz (Columbia, MD) features all those components and more, but... — Jack Browne [Product Technology] Digital Receiver Processes 3 GHz Digital receivers offer versatility that is simply not possible with conventional superheterodyne or homodyne analog receivers. The model RX00103-005 digital receiver from LNX Corp. (Salem, NH) is a case in point: the wideband, dual-channel module... — Jack Browne [Product Technology] MEMS Technology Arms 6-GHz Switch Signal routing in high-frequency systems requires reliable switches. For higher-power signals where speed is not an issue, designers often prefer the robust performance of electromagnetic (EM) switches. For lower-power signals where switching speed... — Jack Browne [Editorial] Planning For Future Combat Systems Casualties are an inevitable part of any military conflict, as Americans have constantly been reminded by this country's involvement in Iraq. Effective military electronic systems can help to minimize those casualties, however, by providing what at... — Jack Browne |
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