An Interface Circuit With Wide Dynamic Range for Differential Capacitive Sensing Applications
Bibliographic record
Abstract
An interface circuit for differential capacitive sensing applications with tunable dynamic range is presented. Capacitive microsensors are ubiquitously employed in many applications pertaining to all aspects of modern life. The proposed circuit requires a small chip area and offers a good signal-to-noise ratio as well as adjustable sensitivity and dynamic range. Reference signals are produced on chip and used for the synchronous demodulation of current signals through a differential capacitive sensor. In addition to the normal open-loop operation mode of the circuit, it can be operated within a novel closed-loop configuration in order to extend its dynamic range. The circuit was designed and fabricated in a standard 0.35-μm CMOS technology from Austriamicrosystems. Experimental and simulation results are presented and discussed. The circuit is capable of resolving 0.4 fF of variation in capacitance with a 50-kHz measurement bandwidth. Reducing the bandwidth to 1 kHz for signal frequencies around 10 kHz increases the dynamic range of the closed-loop circuit to 99 and 110 dB for open-loop and closed-loop circuits, respectively.
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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 | 0.001 |
| 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".