The effects of mismatch in complex bandpass ΔΣ modulators
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Bibliographic record
Abstract
Mismatch between the real and imaginary channels of a complex system is examined and equations are presented that show the relationship between mismatch and image rejection. An example is given that demonstrates the effects of mismatch on the properties of a complex filter. These results are applied to the design of a fourth-order complex bandpass /spl Delta//spl Sigma/ modulator and a technique is discussed that alleviates the negative effects of mismatch on modulator performance. The technique modifies a modulator's noise transfer function by placing a notch in its image band, giving an SNR performance improvement of approximately 15 dB (2.5 bits) over an unmodified modulator. The practical implementation of this technique is discussed.
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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)
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Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
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