A non-linear user defined model of a resonant tunnelling device in harmonic
balance software
- The Department is currently engaged in modelling the high frequency behaviour of resonant
tunnelling devices (RTDs).
These are double barrier quantum well devices grown by MBE or MOCVD which exhibit high non-
linearities in their I-V (and C-V) characteristics: NDR region, high cut-off frequency make it
possible to use RTDs for fundamental power generation at terahertz frequencies
Current equivalent circuit models were established and verified at Bath University (1989-92,
C V Sammut)
- Custom device model written and implemented in Microwave HarmonicaTM (J Muscat & C V
Sammut)
- Model uses actual experimental data on real devices and integrates seamlessly with a
commercial MW CAD & analysis tool
- Next step is to use our models & techniques to simulate power combining from several RTDs
An RTD chip mounted in a microwave package -
top cover removed. This device is a low frequency
test device (MOCVD - Siemens - 50um dot -
packaged at Bath University)
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