Graphene enhanced devices simulation based design microwave optical frequencies | Video

Graphene is a material with extraordinary properties. It promises to open up new application areas or to enhance existing devices, as indicated by a large amount of research on this topic. Currently, commercial applications are still small in number but increasing. EM simulations are a formidable tool to aid in the research and design of new devices that employ graphene.
This webinar will show a number of applications, ranging from RF to optical frequencies. The main focus will be on absorption, nanoantennas, and plasmonic behaviour.

Impact of RF Impairments
Impact of Major RF Impairments on mm-wave Communications using OFDM Waveforms In this paper, the joint impact of major RF impairments which are oscillator phase noise, power amplifier nonlinearity and I/Q imbalance and their impacts on OFDM modulation has been investigated.

Phase noise is caused by the jitter in the oscillator and it results in a phase difference between the received signal and the carrier. Increasing operation frequency can cause higher phase noise. Power amplifier nonlinearity can be seen significantly at mm-wave frequencies as the amplifier design is more challenging at higher frequencies due to physical limits of the semiconductors.

This noise can be shown as I/Q imbalance is caused by amplitude and phase mismatching of I and Q chains of the transceiver. Phase noise could be the main limiter in the system and it becomes more influential at higher frequencies (e.g. 28GHz vs. 82GHz).