Time interleaved C-2C SAR ADC with background timing skew calibration in 65nm CMOS
Bibliographic record
Abstract
This paper presents a 5GS/s 8-bit 40-way time-interleaved SAR ADC fabricated in 65nm CMOS. Two-level hierarchical interleaving is employed, resulting in 4 sub-ADCs each operating at 1.25GS/s at the topmost level with front-end track and hold samplers. The sub-ADCs use capacitive C-2C DACs to minimize the input capacitance and area. A novel background timing skew calibration method is used which requires no redundant signal paths. After calibration, the ADC achieves an SNDR of 33.3dB at Nyquist and consumes 138.6mW from a 1V supply with a 5GS/s sampling rate, yielding an FOM of 738fJ/conv-step. The individual sub-ADC achieves an SNDR of 37.9dB at Nyquist and consumes 34.2mW, yielding an FOM of 428fJ/conv-step.
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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".