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如何判断系统真的做对了? →

做出一枚芯片,离一条可持续的产线有多远?

从一枚通过规格测试的芯片往回走,数一数它没有告诉我们的事:同一片晶圆上有多少良品,设备由谁调校,产线中断以前是否已在承受资金压力。

本文的问题 · 6
  1. 掩模已经算对了,晶圆为什么还可能印不出来?
  2. 买到设备、点亮芯片、连续供货,哪一步已经发生?
  3. 拆开产品看见一枚好芯片,分母在哪里?
  4. 火灾发生在哪一天,工厂的困难就始于那一天吗?
  5. 画出供应链之后,还缺谁会什么?
  6. 收音机响了,距离下一万台还有多远?

掩模已经算对了,晶圆为什么还可能印不出来?

目标是在晶圆上印出一个 L。HOPE 的演讲解释为什么掩模本身需要先补偿变形;ASML 的报道则顺着光走,说明光子还要经过真空光路与多面镜子才抵达晶圆。这是两个可以分别失败的环节:算对掩模的几何图形,不等于系统能稳定传递足够的光。一枚形状正确的试片又能告诉我们多少有关下一批的事?这就回到了量产所需的重复测量。

原文与时间戳 · 4
you'd think I'd put that L shape on a mask.
Indistinguishable From Magic: Manufacturing Modern Computer Chips · ▶ 13:49–13:55
That shape is numerically determined, basically calculated in a supercomputer.
Indistinguishable From Magic: Manufacturing Modern Computer Chips · ▶ 14:11–14:19
the entire process has to happen in a vacuum
Why The World Relies On ASML For Machines That Print Chips · ▶ 8:06–8:16
only about 5% of the photons reach the actual wafer
Why The World Relies On ASML For Machines That Print Chips · ▶ 9:44–9:52

买到设备、点亮芯片、连续供货,哪一步已经发生?

看见「购入一套设备」时,先在纸上接着写出几格:装好、调通、生产一批、筛出良品、完成交付。俄罗斯工厂的历史里,购入二手设备的计划和一条生产线启用的日期是不同种类的记录。东德的案例再揭出另一层困难:采购者能得到的技术和车间实际需要的技术未必一致。只有从后往前问每道工序拿到了什么,才能判断一份采购记录证明了哪一格。

原文与时间戳 · 4
The 90 nanometer production line launched in 2012
Why Russia Can’t Replace TSMC · ▶ 5:11–5:17
purchase some old 110 and 130 nanometer chipmaking equipment from AMD.
Why Russia Can’t Replace TSMC · ▶ 9:34–9:41
Because the Stasi were spymasters not technical experts
How Semiconductors Ruined East Germany · ▶ 14:15–14:22
I'm giving you the best technology available, why can’t you use it?
How Semiconductors Ruined East Germany · ▶ 18:06–18:10

拆开产品看见一枚好芯片,分母在哪里?

拆机找到一枚可用芯片足以说明这种器件曾成功制成。Asianometry 在讲中芯的工艺时追问的是另一笔账:一批做出的晶粒中,多少能通过规格测试?剩余晶粒仍占了晶圆面积和生产步骤。要说这条路线经济上可持续,下一项有用的证据是良率、产量和每枚良品的成本,而不是再找一张相同样品的放大照片。

原文与时间戳 · 3
is it **economically** competitive without EUV?
China's 7nm Chips: SMIC N+2 · ▶ 3:09–3:13
Yield, meaning they can be used and also perform to spec.
China's 7nm Chips: SMIC N+2 · ▶ 4:00–4:04
The 90 nanometer production line launched in 2012
Why Russia Can’t Replace TSMC · ▶ 5:11–5:17

火灾发生在哪一天,工厂的困难就始于那一天吗?

印度 SCL 的厂房火灾是清楚的时间分界,讲者同时指出,竞争所需的资金压力更早就已出现,起火原因本身仍不确定。做一次反事实检验:假定那天没有着火,把重建所需的设备、专业知识和持续投资列在左边;把即使没有火灾也必须支付的成本列在右边。这样既不会抹掉火灾的直接损失,也不会把它当作能解释整段产业史的单一开关。

原文与时间戳 · 3
The cause of the fire remains unknown.
India's Semiconductor Failure · ▶ 7:09–7:21
SCL was starting to experience the financial strain
India's Semiconductor Failure · ▶ 11:01–11:08
I'm giving you the best technology available, why can’t you use it?
How Semiconductors Ruined East Germany · ▶ 18:06–18:10

画出供应链之后,还缺谁会什么?

Friedman 把铅笔拆成供应木材、石墨等组件的人;来自不同地方的参与者不必认识彼此,也能共同交付一件产品。东德工厂的案例让这张依赖图多了一种边:采购到了器件,也需要知道怎样把它接进本地工艺。下次看到技术转让的清单,给每件硬件配一条动作:谁负责调校,谁能发现偏差,谁可以修复?未写在装箱单上的工作也占交付时间。

原文与时间戳 · 3
This black center, we call it lead but it's really graphite
Milton Friedman - I, Pencil · ▶ 0:39–0:46
Literally thousands of people cooperated to make this pencil
Milton Friedman - I, Pencil · ▶ 1:18–1:24
Because the Stasi were spymasters not technical experts
How Semiconductors Ruined East Germany · ▶ 14:15–14:22

收音机响了,距离下一万台还有多远?

在日本半导体故事里,团队已经做出能运行的晶体管收音机,却还没准备好向公众供货。后来谈良率时,分母从一台展品换成一整批器件。若要据此比较两条生产线,还得确认芯片类型和通过测试的标准相同;只把两个百分数并排,可能比较的是两张不同难度的考卷。

原文与时间戳 · 2
This radio worked but product and production were not good enough to sell to the public.
How Japan Learned Semiconductors · ▶ 6:07–6:12
Japanese yields were hitting 70-80%
How Japan Learned Semiconductors · ▶ 15:22–15:26

读完再想一步

找一则宣称「突破量产」的报道,分别圈出产品样片、合格比例和交付数量的出处。若只找到其中一项,下一份最值得查的记录是什么?