Optimization of the breakdown voltage in LDMOS transistors using internal field rings
Bibliographic record
Abstract
It is shown that field rings in the drift region of LDMOS (lateral double diffused MOS) transistors can be used to reduce the electric field at the Si/SiO/sub 2/ interface and increase the breakdown voltage of the structure. A first order analytical approach shows the upper limit of the position of the ring with respect to the channel, and the doping concentration within the ring to increase the breakdown voltage. A 2-D numerical calculation of the breakdown voltage and on-resistance of the LDMOS transistor is presented. The results, which support the analytical approach, allow the designer to use simple design rules for the implantation of high-voltage LDMOS transistors on thick epitaxial layers. A potential improvement of the breakdown voltage arises if the distance between the channel and the field ring is equal to the field plate length and the doping concentration in the ring satisfies a specified equation. Doubling the breakdown voltage is associated with a 25% increase in device area. The on-resistance depends mainly on the field ring position with respect to the channel. A good tradeoff between the breakdown voltage and on-resistance is obtained when the channel-ring distance is equal to the field plate length.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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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".