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Industry News

GREEN LIGHT FOR PHILIPS LEAD-FREE PRODUCTS

Royal Philips Electronics has announced that the conversion to the Restriction of Hazardous Substances (RoHS) compliant/lead-free semiconductor products has been completed well ahead of European legislation mandating the manufacture of such electronic products by 1 July 2006 under European Commission Directive 2002/95/EC. In July 2001, Philips Semiconductors teamed up...
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A 125 W Pulsed Ku-band Power Amplifier

Advanced Ku-band radar systems used in airborne military platforms need reliable, small size and weight, high power amplifiers. Sophia Wireless Inc. has developed a solid-state power amplifier, model MPC8-1520, which meets these requirements. Its key features include: Operating frequency: 16 to 17 GHz Internally pulsed RF DC storage capacitor...
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CPW Transmission Insertion Loss on Si and SOI Substrates

The transmission loss properties of coplanar waveguide (CPW), built on bulk silicon and low and high resistivity silicon-on-insulator (SOI) substrates, are investigated systematically in this article. The experimental results show that the insertion lo...
Coplanar waveguides are widely used in MMICs as interconnects and matching networks. Designing low loss, multifunctional and highly integrable transmission lines is a key factor in obtaining high performance from MMICs in silicon technology. 1 Nevertheless, the low resistivity of a standard silicon substrate deteriorates the performance of on-chip...
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A UWB Filter Using a Dual-mode Ring Resonator with Spurious Passband Suppression

A novel, compact, microstrip bandpass filter for ultra-wideband (UWB) radio systems is proposed. This filter has a 3 dB fractional bandwidth of 60 percent, with low insertion loss and sharp rejection. Based on a dual-mode ring resonator structure and w...
The investigation of the use of ultra-wideband (UWB) has been one of the most controversial technologies of modern times. Its applications can be seen in diverse areas such as local area networks, position location searching, advanced imaging of the human body, etc. Microwave ring resonators are the components proposed...
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A New Class of Asymmetrical Directional Couplers for Power/Antenna Control Applications

A new class of asymmetrical directional couplers, convenient for power and antenna control applications, is proposed. The couplers can be fully or partially integrated into a printed circuit board (PCB). The couplers operate over -20 to -40 dB coupling...
Integration of RF power, RF small signal, digital, DC and supervision circuits is still one of the main goals of modern radar, satellite and wireless communications technology. Today’s solutions of close-to-antenna devices use a stack approach for integration of RF filters with power splitters/combiners and multilayer printed circuit boards...
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Making Thermal Resistance Measurements without Test Diodes or Thermal Stages

Thermal resistance is a measure of the amount by which the junction temperature rises for a given level of power dissipation in a transistor Thermal resistance is important since it determines how much power a device and package combination can safely dissipate. Thermal resistance measurements normally require the measurement...
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