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Adom Fields
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Adom Fields: where the current and the heat go on your board.
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John Lauer
0.9.5: compliance prediction with bench calibration, certification readiness report
e0da4a3
adom-fields 0.9.5
- Compliance prediction (
review.compliance).- The sources: every emission source the review models (the switching hot loop, each cable's common mode, an oscillator's copper, a receiver's oscillator leaking out of its antenna port, and the conducted emissions) in one table against the chosen limits.
- Bands and verdicts: each source has an uncertainty band from its model's own error, and each test (radiated, conducted, antenna port) gets a verdict.
- Fixes: ranked by the dB each buys per source. These cover a slower edge, spread spectrum, a smaller loop, a ferrite, a choke, moving a connector's ground, an input filter, RF isolation and a shield can. With them comes the cheapest combination that gets every source to 6 dB.
- A bench plan: LISN, current clamp, near-field probe and antenna port, each with the level to expect.
- Bench calibration: spec
measurementsmove a prediction onto the bench's reading and narrow its band to ±2 dB. A cable reading also moves the other cables. - On the TPS54202 buck:
- Predictions: radiated at risk (J2's cable −7 to +13 dB), conducted likely fail (−33.5 dB). The cheapest fix set is an input filter, spread spectrum and a 16 ns edge.
- With a 9 dBµA clamp reading on J2: radiated becomes a thin pass, and the set drops to the input filter plus spread spectrum.
- On the AM/FM receiver: the FM oscillator's leak out of the antenna port is 16 dB over FCC 15.111. An RF amplifier's isolation plus weaker LO coupling gets it to +9.6 dB.
- Certification readiness report (
adom-fields report).- Inputs: the fields solve, Adom Safety's creepage and clearance check, and Adom Mechanics' reliability screen.
- Output: one Markdown and JSON report, with each area ready, needs work, blocked or not checked, its numbers and findings, what the report does not cover, and the evidence hashes.
- The buck today: blocked by conducted emissions. Mechanics needs work (an 0805 inside a mounting pin's keep-out). The rest is ready.
# adom-fields 0.9.5
- **Compliance prediction (`review.compliance`).**
- **The sources:** every emission source the review models (the switching hot loop, each cable's common mode, an oscillator's copper, a receiver's oscillator leaking out of its antenna port, and the conducted emissions) in one table against the chosen limits.
- **Bands and verdicts:** each source has an uncertainty band from its model's own error, and each test (radiated, conducted, antenna port) gets a verdict.
- **Fixes:** ranked by the dB each buys per source. These cover a slower edge, spread spectrum, a smaller loop, a ferrite, a choke, moving a connector's ground, an input filter, RF isolation and a shield can. With them comes the cheapest combination that gets every source to 6 dB.
- **A bench plan:** LISN, current clamp, near-field probe and antenna port, each with the level to expect.
- **Bench calibration:** spec `measurements` move a prediction onto the bench's reading and narrow its band to ±2 dB. A cable reading also moves the other cables.
- **On the TPS54202 buck:**
- **Predictions:** radiated at risk (J2's cable −7 to +13 dB), conducted likely fail (−33.5 dB). The cheapest fix set is an input filter, spread spectrum and a 16 ns edge.
- **With a 9 dBµA clamp reading on J2:** radiated becomes a thin pass, and the set drops to the input filter plus spread spectrum.
- **On the AM/FM receiver:** the FM oscillator's leak out of the antenna port is 16 dB over FCC 15.111. An RF amplifier's isolation plus weaker LO coupling gets it to +9.6 dB.
- **Certification readiness report (`adom-fields report`).**
- **Inputs:** the fields solve, Adom Safety's creepage and clearance check, and Adom Mechanics' reliability screen.
- **Output:** one Markdown and JSON report, with each area ready, needs work, blocked or not checked, its numbers and findings, what the report does not cover, and the evidence hashes.
- **The buck today:** blocked by conducted emissions. Mechanics needs work (an 0805 inside a mounting pin's keep-out). The rest is ready.