An integrated 3.6 GHz bidirectional direct quadrature modulator/demodulator
Bibliographic record
Abstract
A bidirectional direct quadrature modulator/demodulator IC has been developed for high speed data communication applications in enhanced digital wireless communication systems operating in the 3.6 GHz fixed-wireless-access (FWA) band. The IC contains a precise quadrature phase shifter and a passive double balanced mixer core, as well as microwave band amplifiers and the associated signal conversion circuits. An important feature of the design is a passive double balanced mixer which allows the system to function as both a direct quadrature modulator in a transmit channel and a direct quadrature demodulator in a receive channel, which is advantageous for simplified transceiver realization. The mixer's output has a 1-dB compression point of -20.4dB corresponds to a input signal level of -12.5dB and exhibits a high input and output port isolation. The silicon implementation was carried out using Cadence 0.18/spl mu/m CMOS technology. Physical layout of the entire system occupies an area of 1.2mm/sup 2/ with a low power dissipation of 137mW at a single power supply of 3.3V.
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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 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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 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".