Widest Band Amplifier Demonstrated at 235 GHz

University College of London collaborated with Chalmers University of Technology in Sweden to develop and demonstrate the widest band amplifier ever at 235 GHz. Professor Herbert Zirath, in Chalmers’ Department of Microtechnology and Nanoscience and Professor Izzat Darwazeh of UCL’s Department of Electronic and Electrical Engineering led the work.

In the summer of 2012, Zirath and Darwazeh began project to design circuits for communication approaching the terahertz (THz) region. PhD-student Klas Eriksson designed a set of amplifier circuits that Teledyne in the USA fabricated. Researchers at Chalmers measured them a few months ago.The new amplifiers demonstrated extremely wide broadband operation ranging from low GHz frequencies to over 235 GHz.  The amplifiers provided a gain over 15dB, translating to a gain bandwidth product of about 1.5 THz. The team believes the amplifier is at least twice the bandwidth of the highest bandwidth amplifier previously reported.

Professor Darwazeh said, “This achievement was possible both because of excellent technological advances in nanotechnology and state of the art design processes and techniques. This technology will help make ultrafast broadband possible for widespread use not only for communication systems but also for different scientific and test and measurement instrumentation.”

The device’s design builds on two decades of previous research and design work by Zirath and Darwazeh. Details of the work will be presented at the forthcoming IEEE International Microwave Symposium (IEEE-IMS) in Florida, June 2014.