Disqus
NTT DoCoMo has developed a prototype multi-band power amplifier that accommodates eight frequency bands between 700 MHz and 2.5 GHz. As a result, a not-too-big mobile phone that works across frequencies — including LTE, W-CDMA and GSM — could be developed.
DoCoMo’s amplifier does its magic by employing matching circuits whose frequency characteristics are controlled by multiple semiconductor switches according to the required frequency band.
Standard mobile phones use a separate single-band amplifier for each band, hence a device that could work across various networks inevitably increases in size to accommodate new frequency bands.
And for the record, power amplifiers are used in mobile phones to increase signal power up to levels required for wireless communication.
About The Author
Dusan Belic
Dusan has been using smartphones since their introduction and is now following the latest trends in the industry. The "convergence" is what he's most excited about, and writing about it is the next logical thing to do. He thinks that using a smartphone is what everyone who cares about their time should do. In addition to his interests in mobile phones, Dusan also loves to experiment with the latest web and mobile 2.0 services. The idea of accessing and managing your information from any device no matter where you are simply amazes him. Whether it's an online to-do list, note taking service or a video sharing social network, he's there to try it out. He admits though, he's still searching for the ultimate web-based organizational tool, which "sings" perfectly with the mobile PIM application. Dusan used to run SymbianWatch.com which later became part of IntoMobile. He lives in Serbia, South-East Europe, from where he edits the site on a daily basis.
