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Modelling of THz power generation based on ultra-fast PIN photodiodes
| Content Provider | Semantic Scholar |
|---|---|
| Author | Fritsche, Carsten Krozer, Viktor |
| Copyright Year | 2005 |
| Abstract | A large-signal and small-signal model for PIN and superlattice PIN photodiodes have been developed and implemented into a CAD tool. Results for the predicted output power from these devices are presented and optimization is outlined. The model is intended for the determination of the embedding impedance at large-signal operation. A large amount of literature exists on the performance and circuit modelling of PIN diodes both for electrical and optical applications. A number of models exist for the PIN photodiode, which are in general small-signal models, including the models for travelling-wave structures [1], [2]. Most models do net lend themselves to implementation in a circuit simulator. A large-signal PIN photodiode model suitable for circuit simulations has been developed including avalanche breakdown for APDs photodiodes and for reverse bias only. This model has also been used for nipnip superlattice photodiodes. It is based on the drift-diffusion model with a modified velocity versus field characteristic and takes into account the rate equations. The model is currently being extended to include travelling-wave effects, which will be discussed during the conference. Simulation studies have been performed for PIN photodetectors for IR power generation [3]. These include simulation of the DC dark and illuminated currents, as well as prediction of RF performance. Especially interesting is the determination of the large-signal impedances, because these indicate the impedance level required by the antenna or waveguide structures. Fig. 1 shows the comparison between measured and predicted PIN diode dark currents. Also shown are predictions of the THz power output versus frequency. The predicted power is in the range of 2-3 mW at 100 GHz and 200 μW at 1000 GHz. At higher frequencies it is clearly observed how the power drops according to a slope of 1/f . |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.nrao.edu/meetings/isstt/papers/2005/2005486489.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
