Scientists create graphene electronic mixer

Researchers at Sweden’s Chalmers University have walked away from their massage tables having pummelled out a CMOS compatible graphene based electronic mixer.

Electronic mixers combine multiple input signals into one or two composite outputs and while they had been successful at getting one to go at microwave frequencies they think it could be ready to scratch up to the terahertz range.

Jan Stake, professor of the research team, says that the performance of the mixer can be improved by further improving the circuit, and improving the on-off ratio and finding a really good DJ.

Stake is a big fan of G‐FET, who is not a DJ from Slut in Vasterbotten but a topology which pushes the mixer into higher frequencies.

This helps it to push the exceptional properties of graphene and paves the way for future technologies operating at high frequencies which only your dog can hear.

This will be jolly useful for security radar systems, radio astronomy and environmental monitoring or anywhere you might need a large array of highly sensitive, and compact mixers.

It all works because graphene can switch between hole and electron carriers thanks to its field effect. The mixer is built using only one transistor which makes it very small.

It means that scientists can now think of the possibility of advanced sensor arrays for imaging at millimetre waves and even sub millimetre waves as G-FET technology progresses. Well, it beats going to the pictures.

The full text can be found here.