VR2-0377
① SA Source
- Source: 開啟完整 SA 文章
- Section:
PCB Materials Upgrade and Area Growth - Line hint:
473
Context Before
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).
Quartz cloth is the next generation material that replaces the glass fiber cloth materials as the reinforcing layer, pushing dielectric constant even lower. Besides lower dielectric constant, quartz cloth also has the benefits of being stronger, more temperature resistance, and having a lower CTE. On the other hand, the cost is multiples higher than that of the highest-grade glass fiber cloth and is much harder to process at the PCB manufacturing level, leading to worse yield.
Evidence
However, given the cost of the Quartz cloth and the difficulty in Q cloth processing, Nvidia is currently exploring the option of downgrading back to glass fiber cloth
Context After
Source: Nvidia VR NVL72 Component BoM and Power Budget Model ↗
② Atomic Claim
但考量 Quartz cloth 成本與 Q cloth 加工難度，Nvidia 目前正評估降回 glass fiber cloth 的方案。
- Epistemic Mode:
ASSERTED - Mapping Status:
COMPLETE
③ Semantic Frame
{
"attribute": "COST",
"context_nodes": [
{
"id": "02_companies/NVDA",
"label": "Nvidia"
},
{
"id": "04_knowledge_base/高階玻纖布",
"label": "glass fiber cloth"
}
],
"entity": {
"id": "04_knowledge_base/Quartz cloth",
"label": "Quartz cloth"
},
"frame_type": "ATTRIBUTE",
"qualifiers": {
"condition_text": null,
"numeric_mentions": [],
"temporal_mentions": []
},
"value": {
"numeric_mentions": [],
"value_text": "但考量 Quartz cloth 成本與 Q cloth 加工難度，Nvidia 目前正評估降回 glass fiber cloth 的方案。"
}
}④ Canonical Entity Mapping
| Role | Surface Label | Canonical Target |
|---|---|---|
| entity | Quartz cloth | 04_knowledge_base/Quartz cloth |
| context_0 | Nvidia | NVDA |
| context_1 | glass fiber cloth | 04_knowledge_base/高階玻纖布 |
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。