Friday, July 30, 2010

Understand Radio Architectures, Part 1

May 21, 2009

The fundamental operation of an RF front end is fairly straightforward: it detects and processes radio waves that have been transmitted with a specific known frequency or range of frequencies and known modulation format. The modulation carries the information of interest, be it voice, audio, data, or video. The receiver must be tuned to resonate [...]

Read the full article →

What’s in an RF Front End?

May 21, 2009

The following is excerpted from Chapter 8 from a new edition of the book, RF Circuit Design, 2e by Christopher Bowick. Order the Book here http://www.rfengineer.net/rf-books/ The RF front end is generally defined as everything between the antenna and the digital baseband system. For a receiver, this “between” area includes all the filters, low-noise amplifiers [...]

Read the full article →

Please Help John Kanzius – RF-Induced Hyperthermia Device

May 2, 2009

If you can help one of readers build a John Kanzius – RF-Induced Hyperthermia Device. See post http://www.rfengineer.net/rf-induced-hyperthermia-need-help-building-this/ Please contact Victoria hicksv3@aol.com

Read the full article →

RF-Induced Hyperthermia – Need Help Building This

May 1, 2009

On of our readers needs help building one of these. US Patent Application # 20060190063 Enhanced Systems and Methods for RF-Induced Hyperthermia 24 August 2006 US Cl. 607/101 Intl Cl. A61F 2/00 20060101 A61F002/00 Abstract — A method of inducing hyperthermia in at least a portion of a target area–e.g., a tumor or a portion [...]

Read the full article →

Improving multi-carrier PA efficiency using envelope tracking

April 6, 2009

By Gerard Wimpenny, Nujira Modern complex modulation schemes have the disadvantage of requiring linear power amplification, which compromises overall system efficiency because RF power amplifiers (PAs) are much less efficient when backed off from maximum power. The power amplifier and its associated components consume up to 50% of the overall power in a cellular basestation [...]

Read the full article →