MVSG GaN-HEMT Model: Approach to Simulate Fringing Field Capacitances, Gate Current De-biasing, and Charge Trapping Effects
Bibliographic record
Abstract
This paper presents new features of the latest MIT Virtual Source GaN-HEMT (MVSG) model covering fringing field capacitances, gate current de-biasing, and charge trapping effects. These model augmentations capture physical device phenomena observed in industry-devices in a robust, computationally efficient fashion. The features enhance simulation accuracy in both HV and RF-circuit applications and is included in the upcoming standard release of the industry-standard MVSG Verilog-A code. Contributions of this work are: (i) Bias-dependent fringing fields that can describe non-linear device-capacitance behavior due to charge-depletion in drain-access region beyond the last field-plate (FP). Previously, this effect was modeled using a "dummy" non-physical field-plate. (ii) Assignment of gate-source and gate-drain Schottky diodes to internal source/drain-nodes before and after FPs. Charge-depletion in FPs at high V <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">DS</inf> results in transitions in both gate-current (I <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">G</inf> ) and capacitance (C <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">GG</inf> ) which can be accurately modeled using the new approach. (iii) Enhanced charge-trapping effects that include drain-lag and gate-lag effects, both capture and emission time-constants and their temperature-dependencies. The model is calibrated against measured transient pulsing data and accurately describes dynamic saturation-current (I <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">DSat</inf> ), knee-voltage (V <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Knee</inf> ) and output-conductance (g <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">DS</inf> ). New parameters are added in the model to capture the effects and can be extracted from independent measurements.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".