A 39GHz Bandwidth, 2.5GS/s 7-bit SAR ADC in 22nm FDSOI CMOS
Bibliographic record
Abstract
A synchronous SAR ADC lane architecture using time-interleaved comparators to drive half of the shift-register cells on alternate phases of the clock is proposed to relax the delay constraints around the SAR loop and thus maximize the sampling rate. The set-and-down capacitive DAC further increases the sampling-rate while reducing front-end loading on the input buffer stage to achieve a record analog input signal bandwidth of 39 GHz. The 7-bit SAR ADC, manufactured in 22nm FDSOI CMOS, also includes a 12.5% duty cycle, 8-phase generator featuring CMOS logic with inductive peaking which operates with input clock frequencies up to 40 GHz. The SAR ADC lane occupies 75µm×10µm and consumes 17.5 mW at 2.5 GS/s, and 19.4 mW at 3 GS/s. It achieves an ENOB of 5.18 and 4.75 at 2.5 GS/s and 3 GS/s, respectively, with SFDR greater than 34 dB over the 39 GHz input bandwidth, limited by the linearity of the input buffer.
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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) | 0.002 | 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 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".