8.6 A Highly Reconfigurable 40-97GS/s DAC and ADC with 40GHz AFE Bandwidth and Sub-35fJ/conv-step for 400Gb/s Coherent Optical Applications in 7nm FinFET
Bibliographic record
Abstract
Low power digital signal processing (DSP) and optical integration have fueled the development of high-performance optical pluggable modules due to their deployment flexibility and network disaggregation. In addition, the rapid growth of new technologies such as 5G, cloud computing, IoT and AR/VR has prompted the demand for even higher data rates, requiring optical modules to scale beyond 400Gb/s while targeting the best possible tradeoff between power efficiency and reach. This necessitates more complex equalization schemes and coding techniques such as probabilistic shaping (PS) [1] and drives ever higher the specifications of analog building blocks. These requirements, as a result, constantly push the envelope of traditional analog-front-end (AFE) bandwidth and the rates of companion data converters such as DACs and ADCs to the technology limits, making it challenging to address a diversity of DSP modulation needs and oversampling rates while maintaining low power consumption. In this paper, we present an energy efficient optical transceiver fully integrated in a 400G coherent DSP chip using 4 reconfigurable 40-97GS/s 8b DACs and ADCs with a 40GHz AFE bandwidth, fabricated in a 7nm FinFET process.
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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".