VR2-0360
① SA Source
- Source: 開啟完整 SA 文章
- Section:
PCB Materials Upgrade and Area Growth - Line hint:
465
Context Before
Source: Panasonic
Evidence
As discussed earlier, due to the skin effect, smoother copper foil equals to lower insertion loss
Context After
For the power layers, the additional layers in Strata compared to Blackwell are mostly power layers to accommodate more power going into the GPU. By adding more dedicated power layers, cross talk is reduced as power layers and signal layers are separated. Power layer copper foils are much thicker to insulate the current travelling through it.
The glass fiber cloth upgrade aims to reduce the dielectric constant of CCL. Beside glass fiber cloth, resin is also a key factor contributing to dielectric constant. To achieve a desirable dielectric constant, the CCL makers have their unique recipes to their formulation of the two dielectric materials in the CCL. Currently, debate around the CCL spec is around the adoption of Quartz cloth (Q glass).
② Atomic Claim
如前述，受 skin effect 影響，copper foil 越平滑，insertion loss 越低。
- Epistemic Mode:
ASSERTED - Mapping Status:
PARTIAL
③ Semantic Frame
{
"attribute": "UNSPECIFIED_ATTRIBUTE",
"context_nodes": [
{
"id": "04_knowledge_base/Insertion loss",
"label": "insertion loss"
}
],
"entity": {
"id": "04_knowledge_base/Copper",
"label": "copper"
},
"frame_type": "ATTRIBUTE",
"qualifiers": {
"condition_text": null,
"numeric_mentions": [],
"temporal_mentions": []
},
"value": {
"numeric_mentions": [],
"value_text": "如前述，受 skin effect 影響，copper foil 越平滑，insertion loss 越低。"
}
}④ Canonical Entity Mapping
| Role | Surface Label | Canonical Target |
|---|---|---|
| entity | copper | Copper |
| context_0 | insertion loss | 04_knowledge_base/Insertion loss |
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。