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Industry News

Specification and Measurement of Local Oscillator Noise in Integrated Circuit Base Station Mixers

Residual phase noise from local oscillators can be degraded by additive noise of on-chip local oscillator (LO) drivers/buffers in integrated circuit mixers. Reciprocal mixing of strong RF signals with the LO noise degrades the receiver sensitivity. Spe...
Cellular base station receivers work in the presence of high level blockers/interferers while being required to sense weak signals of interest at the antenna. The interferers are usually rejected by filters but only at an intermediate frequency (IF) after the first down conversion. The LNA and mixer preceding the...
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A Voltage-controlled PIN Diode Attenuator Using an Accurate PIN Diode Model

This article presents a voltage-controlled PIN diode attenuator using an accurate PIN diode model that can precisely simulate the attenuation characteristics. After carefully investigating the problems with conventional PIN diode models, an accurate PI...
PIN diodes have been widely used in a variety of microwave and RF applications, including antenna switches, phase shifters and attenuators. PIN diode attenuators are used extensively in automatic gain control (AGC) and RF leveling applications. Most PIN diode attenuators control the attenuation characteristics through the forward bias current....
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Siemens and Tele2 in Russian Federation

Marrying the skills of two leading companies, the Sweden-based telecom operator Tele2 AB has awarded Siemens Information and Communication Mobile Group (Siemens mobile) the contract to build its GSM 1800 network throughout the Russian Federation. As per the agreement, Siemens mobile will provide the switching network, radio base stations...
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Dual-band WLAN Pioneer Crosses Frontiers

Demonstrating that technical development knows no boundaries, Synad, the fabless WLAN System-on-Chip company, has begun an international expansion programme with the opening of new offices in Asia, Europe and the US. The company has moved into a new 10,000 ft2 headquarters and engineering facility in Reading, UK, which will...
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Radar Antenna Faces Tough Test in Australia

Northrop Grumman Corp. has begun structural testing of the antenna for its Multirole Electronically Scanned Array (MESA) radar, which the company is producing under contract to The Boeing Co. for the Australian Defence Force's Wedgetail airborne early warning and control aircraft. The antenna is an innovative aperture that provides...
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Commerce Dept. Announces Plans for Modernization of Technology Agencies

US Secretary of Commerce, Don Evans, announced that he will propose to modernize the structure for the Department's formulation of technology and telecommunications policy. The new structure will combine the Technology Administration (TA), the National Telecommunications and Information Administration (NTIA) and the e-commerce policy functions of the International Trade...
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Wireless LAN's Future Established as Big Tech and Telecom Companies Enter the Market

The wireless LAN (WLAN) industry is experiencing tremendous growth aided by lower pricing points and standardization of the technology. Allied Business Intelligence (ABI) believes that this growth will continue to accelerate, as multi-billion dollar technology and telecommunications companies such as Microsoft, Intel, Dell, AT&T and IBM, to name a...
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