Clock recovery for a 40 Gb/s QPSK optical receiver
Bibliographic record
Abstract
A clock recovery circuit for a 40 Gb/s optical coherent receiver realized in CMOS 90 nm technology is presented. The core PLL generates less 0.3 ps rms jitter for a bandwidth of 0.5 MHz. This is mainly due to the on-chip differential LC VCO with power supply regulation. The VCO operates at 11.5 GHz center frequency with a 25% tuning range. Its phase noise at 1 MHz offset is better than -110 dBc/Hz, and consumes 3 mW of power. In tone acquisition mode the PLL is a regular charge pump PLL, while in data acquisition mode the DSP core corrects the frequency through the tuning ports. The presented PLL is one of the key components in the 24 Gs/s ADC and coherent receiver chip.
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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".