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继CoWoS之后,COUPE成为AI芯片的下一个关键字

继CoWoS之后,COUPE成为AI芯片的下一个关键字

自英伟达提出以“五层蛋糕”描述AI产业生态——从电力、数据中心、芯片、模型到应用层层堆叠,5月14日,台积电在2026年技术论坛上又抛出“三层蛋糕”理论,台积电副共同营运长张晓强表示,AI芯片本身还可再细分成“三层核心蛋糕”:

底层(Compute):主要指逻辑运算层,如2nm、3nm先进制程下的GPU、ASIC、CPU等;

中层(System Integration):主要指3D IC/异质整合,如CoWoS、SoIC等先进封装技术;

顶层(Optical Interconnect):主要指光互连,即COUPE硅光子技术,台积电明确表示,光互连是未来最重要的技术,并预告COUPE将成为继CoWoS之后,下一个主导AI产业的半导体关键字。

图片说明:台积电技术论坛张晓强演讲重点,数据来源于《工商时报》

COUPE是什么,解决了什么问题?

2021年6月的IEEE第71届电子元件与技术会议上,台积电首次展示了COUPE(Compact Universal Photonic Engine),一款由英伟达与台积电联合研发的“紧凑型通用光子引擎”技术,彼时台积电认为,COUPE这种新型封装技术,相比于基于微凸块封装工艺(uBump)下的引线键合方案(Wire Bonding)和硅通孔方案(TSV),COUPE方案的能耗降低了40%, 信号传输速率提高了70%。

图片说明:COUPE封装方案首次亮相时的性能展示,数据来源于台积电

COUPE诞生于2021年,彼时ChatGPT尚未引发AI革命,如今历经5年时间的研发,COUPE成为了解决CPO方案而量身定制的先进封装工艺。

图片说明:CPO交换机中的COUPE,数据来源于英伟达

具体来说,硅光子技术始终面临的一个巨大挑战,是如何将电芯片(EIC)和光芯片(PIC)高效、紧密地结合在一起。

电芯片EIC负责电信号的处理、放大和控制(如DSP、Driver、TIA等),电芯片需要处理海量数据和极低的功耗,因此一般采用先进制程(如5nm或更小),制程越先进,电芯片EIC的功耗越低、速度越快。

光芯片PIC负责光信号的产生、调制、传输和探测(如光调制器、光电探测器、光波导、波分复用/解复用器等),光的物理波长(通常为1310nm或1550nm)是固定的,如果光芯片也采用先进制,则会发生严重的漏光问题,因此光芯片PIC通常采用较成熟的制程工艺,比如一般来说65nm就已经足够了。

由于EIC和PIC的制程通常不一致,因此很难制作在同一块晶圆上,但同时EIC和PIC又必须“紧密结合”在一起,因为EIC和PIC之间的高速电信号传输极易受到干扰,距离越远、信号衰减就越大,进而就需要更高的功耗去弥补。

在800G和1.6T光模块中,EIC和PIC的主流封装方案,通常采用Flip Chip(3D倒装)与uBump(微凸块)封装工艺,PIC表面和EIC表面都预先做好了极其微小的金属凸块(通常是铜柱加上一点焊锡),将EIC直接倒装贴在PIC上,通过回流焊让两者的微凸块(很小的焊锡球)熔接在一起。

图片说明:光模块中EIC和PIC的封装工艺(连接EIC和PIC的灰色柱子,即微凸块),数据来源于Journal of Lightwave Technology

然而,微凸块再小,也有物理极限(典型高度在20-100μm之间,直径在20-125μm不等),当3.2T或更高速率的信经过焊锡球时,会向外辐射能量(变成电磁波漏走),进而会产生比较严重的寄生电容问题,数字信号容易变得微弱且失真。

当寄生电容问题出现,EIC里的驱动器(Driver)就必须拼命加大马力,用更高的电压和电流去推这个信号,进而抬升系统功耗。

COUPE工艺的核心便在于:EIC和PIC连接点不再是微凸块(焊锡球),而是通过打磨得极其平滑的铜触点(无微凸块的铜对铜混合键合工艺),在原子级别直接吸附在一起,原本几十微米的传输距离,缩短到了个位数微米,寄生电容问题基本消失。

这便是本文开头部分,对台积电2021年首次展示COUPE方案时,表达的能耗降低40%,信号传输速率提高70%的解释。

图片说明:COUPE中EIC和PIC的封装工艺(无微凸块的铜对铜混合键合工艺),数据来源于台积电

目前台积电已经宣布,全球首款采用COUPE工艺的200Gbps微环调制器已于2026年开始量产,未来台积电通过COUPE工艺做好光引擎,再把光引擎通过CoWoS工艺和ASIC芯片封装在同一基板上形成CPO,自然也是水到渠成。

图片说明:为了实现更高的带宽和更低的功耗,光互联的技术路线不停地在变化,数据来源于日月光半导体

先进封装的重要性,怎么强调都不为过

估值之家特别提醒投资者要注意的是:过去几年光通信的蛋糕主要被中国大陆企业瓜分,不排除台积电是酸葡萄心理,因为嫉妒而吹牛的可能性。

同时估值之家也提醒投资者,如果台积电没有瞎吹牛,则意味着光通信的蛋糕未来会不可逆地向英伟达和台积电转移(见下图)。

图片说明:CPO产业链上下游中的参与者,数据来源于SEMI VISION

然而,无论台积电有没有吹牛,有一点是确定性极强的:无论CoWoS还是COUPE,本质都是先进封装工艺,因此先进封装的重要性,未来怎么强调都不为过。

最后,先进封装正好是中国的强项领域,国内已经诞生了一批在国际上具备极强竞争力的先进封装企业,包括但不限于长电科技、通富微电、盛合晶微等等。

END

免责声明

本文所讨论的公司与股价表现无关,股价表现更与宏观变量、行业预期、市场风险偏好等不确定性因素高度相关,因此本文不构成任何投资建议,股市有风险,投资需谨慎。

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  1. CONNECT:[ UseTime:0.000489s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000879s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000338s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000282s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000486s ]
  6. SELECT * FROM `set` [ RunTime:0.000206s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000592s ]
  8. SELECT * FROM `article` WHERE `id` = 641240 LIMIT 1 [ RunTime:0.000433s ]
  9. UPDATE `article` SET `lasttime` = 1784054787 WHERE `id` = 641240 [ RunTime:0.026335s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000395s ]
  11. SELECT * FROM `article` WHERE `id` < 641240 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000649s ]
  12. SELECT * FROM `article` WHERE `id` > 641240 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000472s ]
  13. SELECT * FROM `article` WHERE `id` < 641240 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004260s ]
  14. SELECT * FROM `article` WHERE `id` < 641240 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000743s ]
  15. SELECT * FROM `article` WHERE `id` < 641240 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.012851s ]
0.134873s