A 0.82pJ/b 50Gb/s PAM4 VCSEL Driver with 3-Tap Asymmetric FFE in 12nm CMOS FinFET Process
Bibliographic record
Abstract
This work presents a 0. 82pJ/b50Gb/s PAM4 driver designed for vertical cavity surface emitting laser (VCSEL)-based optical transmitter (TX). The proposed voltagemode (VM) driver uses a new pulsed-cascode structure to improve the optical modulation amplitude (OMA) with low power consumption. The driver also includes an asymmetric 3-tap feedforward equalizer (FFE) for MSB and LSB to effectively compensate for the bandwidth (BW) and nonlinearity response of the VCSEL for PAM4 operation. Finally, the driver is implemented using multiple segments to optimize the driver output impedance and linearity. The proposed design is implemented in a 12nm CMOS FinFET process and measured using a commercial 850nm anode-driven VCSEL.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
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 source (direct Gemma or distilled Codex), 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".