Swedish Researchers Create Graphene Based Electonic Mixer

Sweden's Chalmers University researchers have come up with a sub-harmonic graphene mixer that is CMOS compatible.

Electronic mixers are basically devices that combine various input signals to produce one or two outputs. In the process, the researchers, for the time being have been successful in getting one to achieve microwave frequencies and they are hopping that they can scratch up the output to "terahertz range".

The university in an official statement said that, "Future applications at THz frequencies such as radar systems for security and safety, radio astronomy, process monitoring and environmental monitoring will require large arrays of mixers for high-resolution imaging and high-speed data acquisition," reported Electronicsweekly.com.

According to Jan Stake, a professor in the team of researchers, mixer's performance can be enhanced by working on the circuit and also by bringing some improvements in the on-off ration.

The university statement further says that "Such mixer arrays or multi-pixel receivers need new types of device that are not only sensitive but also power-efficient and compact."

Researchers were able to successfully carry out the experiment because of the inherent properties of graphene whereby it can switch between hole and the electron carriers due to field effect. The electronic mixer has been made with one transistor only, which in effect makes it small, compatible and convenient.

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