- Buyers Guide
5G and IoT Supplement
Fujitsu Laboratories Ltd. announced the development of circuit technology that enables industry-leading electrical efficiency (the ratio between output power and consumed power) for wireless transmission power amplifiers used in radio-frequency wireless devices, such as mobile phone base stations.
In recent years, due to the widespread adoption of smartphones, there has been a constant rise in the number of mobile phone base stations. These base stations and other radio-frequency wireless equipment typically consume a substantial amount of electricity. Transmitter power amplifiers, which are used to amplify transmission signals, consume a particularly large amount of power, which has led to a need for improved electrical efficiency. By applying outphasing(1) in a transmitter power amplifier, Fujitsu Laboratories has developed a compact, low-loss power combining circuit and a high-precision phase error compensation technology based on digital signal processing. These technologies enable high-efficiency transmissions across more than 95% of the transmission duration, compared with 65% for existing amplifiers. In addition, Fujitsu Laboratories succeeded at developing a prototype transmitter power amplifier with a peak output power of 100 W. This development improved average electrical efficiency during transmission, from the current rate of around 50%, to 70%(2).
The new technology will help pave the way toward lower energy consumption for mobile phone base stations and other radio-frequency wireless equipment.
Details of the technology will be announced at a monthly Institute of Electronics, Information and Communication Engineers' Technical Group on Microwave Engineering conference, to be held on October 24, 2013 at Tohoku University in Sendai, Japan.
Get access to premium content and e-newsletters by registering on the web site. You can also subscribe to Microwave Journal magazine.