Widest band amplifier ever at 235 GHz opens door to ultrafast broadband

Mar 14, 2014
Widest band amplifier ever at 235 GHz opens door to ultrafast broadband
Microphotograph of two stage-235 GHz amplifier Microwave Monolithic Integrated Circuit MMIC (Dimensions: 1.12 mm x 0.48 mm)

(Phys.org) —An exciting collaboration between University College London, UCL, and Chalmers University of Technology has led to a world breakthrough in wide band amplifier circuit design.

An exciting research collaboration between UCL and Chalmers has resulted in the design and testing of the widest band amplifier ever reported. The work was led by Professor Herbert Zirath, Head of the Microwave Electronics Laboratory at the Department of Microtechnology and Nanoscience at Chalmers and Professor Izzat Darwazeh, Head of the Communications and Information Systems Group in UCL Electronic and Electrical Engineering.

Zirath and Darwazeh started on the joint project in the summer of 2012 aiming to design circuits suited for communication at frequencies approaching the terahertz (THz) region. A set of amplifier circuits were designed by PhD-student Klas Eriksson, manufactured by Teledyne in the USA and measured at Chalmers a few months ago.

The research team was delighted that the new amplifiers tested achieved results so close to design predictions; exceptionally wide broad band operation; from low GHz frequencies to frequencies exceeding 235 GHz and provided a gain exceeding 15dB, translating to a gain bandwidth product of approximately 1.5 THz. The design team believes this amplifier is at least twice as fast (in terms of bandwidth) as the fastest reported to-date.

"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," Izzat Darwazeh said.

The circuit builds on previous research and design work reported by Zirath and Darwazeh over the past two decades.

"This result is of considerable interest for the development of new products within the area of communication and instrumentation such as fast oscilloscopes, pulse amplifiers and fast fiber optic receivers," Herberth Zirath said.

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EyeNStein
5 / 5 (1) Mar 14, 2014
Interesting that they choose to quote 'Gain Badwidth Product' (as 1.5 THz). As Fab as this sounds its not useful unless they can create stable negative feedback upto 1.5 THz.
The phase shift (delay) from input to output of their amp must preclude this.
Still +15dB gain upto 235GHz is quite an achievement.
orti
not rated yet Mar 14, 2014
Gain is cheap; power output is hard – at least at lower frequencies. But no mention of what it is here.