High-speed CMOS analog Viterbi detector for 4-PAM partial-response signaling
Bibliographic record
Abstract
In this paper, a 1-Gb/s analog Viterbi detector based on a 4-PAM duobinary scheme is discussed with experimental results for a 0.25-/spl mu/m CMOS implementation. This chip is the first analog integrated implementation of a reduced state sequence detector. Pipelining and parallel processing have been incorporated in this design for high-speed operation. Due to test equipment limitations, experimental results are given for 200-Mb/s operation while simulation results indicate a speed of 1 Gb/s. Power dissipation is 55 mW from a 2.5-V supply. The active area occupies 0.78 mm/sup 2/. Although a duobinary scheme has been the focus of this work for its application in optical links, this design can be readily modified or extended to other partial-response signaling schemes such as dicode and PR4.
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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 | 0.001 |
| 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 | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 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".