A 1.9 GHz silicon receiver with on-chip image filtering
Bibliographic record
Abstract
A 1.9 GHz fully monolithic silicon superheterodyne front end receiver is presented; it consists of an LNA, a tunable image reject filter and a Gilbert cell mixer integrated in one die. The chip was fabricated using NORTEL's 0.5 micron bipolar technology with 25 GHz f/sub t/. The receiver was designed to operate with a 1.9 GHz RF and a 2.2 GHz L.O. For a 300 MHz IF. Measured performance for the complete receiver (packaged) was: conversion gain 33.5 dB, noise figure 4.9 dB, input IP3-28 dBm, 50 dB image rejection (tuned to reject a 2.5 GHz image frequency) and 15.9 mA current consumption at +3 V. The image rejection can be tuned from 2.4 GHz to 2.63 GHz. A new version with improved linearity is in fabrication.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.002 |
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".