A bandwidth enhancement technique for CMOS TIAs driven by large photodiodes
Bibliographic record
Abstract
A new method of enhancing the bandwidth of a conventional series-peaked transimpedance amplifier (TIA) driven by a large photodiode is introduced. It is shown that by using N identical TIAs in parallel the circuit bandwidth can be significantly improved. The advantage of the proposed technique is in its ability to provide large bandwidth enhancements in multi-GHz frequency ranges even when photodiode capacitance is large, without a noticeable increase in TIA core circuit area. This technique is supported by a design example simulated in a 0.13μm standard CMOS technology. Simulation results show a 3dB bandwidth of 26GHz with 0.5pF photodiode capacitance, a transimpedance gain of 51dBΩ and group delay of 33.5±4ps. The proposed technique shows an overall bandwidth enhancement ratio of 3.25 with less than 0.1dB gain ripple resulting in higher bandwidth enhancement than previously reported for large photodiode capacitances.
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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 | 0.000 |
| 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 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 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".