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PRODUCT FEATURE BROADBAND DC TO 4 GHZ DIGITAL ATTENUATORS WITH HIGH ACCURACY HITTITE MICROWAVE CORP. Chelmsford, MA Control of signal strength while maintaining signal integrity in the transmit and receive paths of wireless systems has always been a concern of RF design engineers. A family of seven low cost...

TECHNICAL FEATURE HARMONIC TUNING OF POWER TRANSISTORS BY ACTIVE LOAD-PULL MEASUREMENT Abstract: A nonlinear network analyzer combined with an active multiharmonic load-pull system is described. Data acquisition uses an HP 71500 microwave transition analyzer (MTA) and force/sense bias supplies. Complete tuning and monitoring of the incoming and outgoing signals...

TECHNICAL FEATURE THERMAL DESIGN CONSIDERATIONS FOR WIDE BANDGAP TRANSISTORS Abstract: The peak junction temperature of a transistor is an important factor in determining its lifetime and output power degradation over time. Many design parameters determine the temperature rise in the semiconductor, including the transistor performance, semiconductor material and device...

TECHNICAL FEATURE HIGH POWER RF LDMOS TRANSISTORS FOR AVIONICS APPLICATIONS Abstract: This article describes the inherent advantages of using laterally diffused metal oxide semiconductor (LDMOS) amplifiers in high power avionics transponder applications. In comparing this technology to bipolars, key device features such as gain, linearity, switching, thermal issues and...

TECHNICAL FEATURE SIMULATION OF INTERDIGITATED STRUCTURES USING TWO-COUPLED-LINE MODELS Abstract: Some commercial microwave CAD programs do not incorporate models for more than three coupled lines. This fact is especially critical in the design and analysis of multiple-line planar structures, such as interdigital, combline and hairpin filters, meander lines, spiral...

TUTORIAL LOW NOISE VCOS: KEY COMPONENTS FOR BASE STATIONS FRANK BABERG Tekelec Temex Munich, Germany   The great economic success of modern mobile radio systems such as GSM and the digital communication system (DCS) means even greater utilization of the capacity of existing channels. Therefore, it is immensely important...

TECHNICAL NOTE FRACTIONAL OUT-OF-BAND POWER FORMULAS FOR BPSK, QPSK AND MSK FRANK AMOROSO Consultant Santa Ana, CA   Fractional out-of-band power (FOBP) has for some time been a standard metric of spectral containment for digital data signals.1 For any given modulation scheme the FOBP can be measured experimentally or...

News From Washington F/A-18 Radar Production Contracts Awarded Raytheon Co. has received two contract awards for the production of the AN/APG-73 radar for installation in US Navy, US Marine Corps and Royal Australian Air Force (RAAF) F/A-18 aircraft. An award from the Boeing Co. totals approximagely $467.2 M and...

International Report Thomson-CSF Wins BIFF Contract French contractor Thomson-CSF Comsys has been awarded a Euro 38 million contract covering the production of 1500 Battlefield Identification Friend-or-Foe (BIFF) systems for France's armed forces. As currently structured, the French BIFF effort anticipates acquisition of 5400 units in three production lots. The...

Commercial Market Hong Kong Telecommunications Market Opens Up The Hong Kong government has opened up its telecommunications market by granting fixed network licenses to five companies and the right to operate international satellite services to 12 other applicants. PSINet HK Ltd., HKNet-Teligent Company Ltd., HK Broadband Network Ltd., Eastar...