VR2R-0302
① SA Source
- Source: 開啟完整 SA 文章
- Section:
PCB vs Flyover Cables - Line hint:
274
Context Before
The three main mechanisms contributing to insertion loss in a PCB channel are conductor loss from skin effect and copper surface roughness, dielectric loss from laminate absorption, and geometry loss from discontinuities such as vias and layer changes.
Evidence
Conductor loss is driven by copper surface roughness.
Context After
As signals travel down the copper traces in the PCB, energy is lost due to the resistance in copper. At higher frequencies, the signal traveling through the copper crowds toward the surface of the trace, which is known as the skin effect. On top of the natural resistance of copper, if the surface is rough, the current will not travel along a uniform path incurring more resistance and loss.
② Atomic Claim
Conductor loss 主要由 copper surface roughness 驅動。
- Epistemic Mode:
ASSERTED - Mapping Status:
PARTIAL
③ Semantic Frame
{
"frame_type": "CLAIM_ONLY",
"qualifiers": {
"condition_text": null,
"numeric_mentions": [],
"temporal_mentions": []
},
"reason": "CONDUCTOR_LOSS_AND_COPPER_ROUGHNESS_NOT_CANONICALIZED",
"statement": "conductor loss is driven by copper surface roughness."
}④ Canonical Entity Mapping
| Role | Surface Label | Canonical Target |
|---|---|---|
| — | — | — |
⑤ Human Review
請在 Properties 逐項確認：
- 原文 → Atomic Claim 是否忠實
- Atomic Claim → Semantic Frame 是否忠實
- Canonical Entity mapping 是否正確
- Epistemic mode 是否保留原文語氣
- 最後選擇
review_action
Review state
Markdown 內文不是正式 approval。只有 Apply bridge 寫入的 Decision Ledger event 才是正式決策。