Fujitsu Laboratories has developed a circuit technology that enables industry-leading electrical efficiency for wireless transmission power amplifiers used in radio-frequency wireless devices, such as mobile phone base stations.
Fujitsu Laboratories has developed a compact, low-loss power combining circuit along with 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).
Fujitsu said its new technology will help pave the way toward lower energy consumption for mobile phone base stations and other radio-frequency wireless equipment.
http://www.fujitsu.com/global/news/pr/archives/month/2013/20130926-01.html
