4-A Chips Charge Smart-Phone Li-Ion Batteries
MD&D News Staff
Trumpeted as the first monolithic, 4-A Li-ion battery charger ICs, Summit Microelectronics’ configurable SMB349 and SMB359 operate from a 3.6-V to 16-V input range...
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Ericsson awarded Bluetooth license agreement by Winbond
Stockholm -- Ericsson Technology Licensing announced a licensing agreement with Winbond Electronics Corp., a Taiwanese semiconductor manufacturer....
Maury Microwave and Modelithics form alliance
Ontario, Calif. -- Maury Microwave Corp. announced that it signed an agreement with Modelithics Inc. to advance the application of load/source pull measurement for more efficient non-linear device modeling and circuit design....
A monolithic X-band Class-E power amplifier for space based radar systems
Low cost, highly efficient, high power, microwave and RF amplifiers are required for many commercial and defense system applications. These include WLANs,...
Affordable phase shifters for electronically scanned phased array antennas
Phase shifters are critical elements for electronically scanned phased array antennas, and typically represent a significant amount of the cost of producing...
Multitone IMD offers clearer picture of MCPA performance
Characterizing distortion is essential when evaluating multicarrier power amplifier (MCPA) performance. Traditional two-tone tests for intermodulation distortion (IMD) or single-carrier adjacent channel power ratio (ACPR) measurements are not sufficient to evaluate MCPAs. These amplifiers must instead be evaluated using multiple carriers as the stimulus, which more realistically simulate conditions the amplifiers will encounter in service. As an alternative to multiple carriers, multiple tones w...
Mobile Multimedia Antenna
Antenova Ltd.'s unique antenna technology improves signal quality such that data transfer rates are multiplied, allowing handsets to support broadband...
Microwave PA Thermal Design for SATCOM Systems
For many years, solid state power amplifiers and traveling wave tube amplifiers have been in competition in communication services. This is particularly so in satellite communication systems. Currently, the highest RF output power achievable from microwave transistors is 60 W at 6 GHz and 20 W at 14 GHz. Not only is the DC to RF efficiency a concern, but the RF combining efficiency is also critical to the success of a solid state power amplifier....
Designing High Efficiency Overdriven and Saturated Power Amplifiers
It is common knowledge that efficiency is a major issue with the design of any transmitter. The benefits of high efficiency include power consumption, low power derating and high reliability, among others. In order to improve efficiency several specific amplification classes, such as class E
EDGE Modulation — How Linearization Improves Amplifier Performance
Historically, the global system for mobile Communications was intended to make power amplifier design simpler. With the introduction of high order modulation schemes for 2.5 and 3G, the design challenges presented to the PA have increased significantly. This article describes the design and implementation of a polar loop to improve the efficiency of a gallium-arsenide field effect transistor (GaAs FET) power operating at 1.91 GHz....
Economy threatens world discrete diode markets
After a period of phenomenal growth due to booming telecommunications and data communications industries, the world market for discrete diodes is constricting,...
Adaptive DC power management for HBT PAs in CDMA handsets
In today's wireless handset market, extending battery life for increased standby and talk time continues to be a paramount goal. Because battery technology...
Noise and ACPR correlation in CDMA power amplifiers
[For a copy of this article in PDF format, which displays figures and equations, click here. Requires Adobe Acrobat Reader, free download.] The issue...
Mounting high-power flanged RF devices to multi-layer PCBs
[For a copy of this article in PDF format, which displays figures and equations, click here. Requires Adobe Acrobat Reader, free download.] Conventional...
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