Military Industry of Great Powers: Build the Strongest Flanker

"Using computers to design chips?"

This was the first time Ji Hongbo heard this statement. He looked at Zhao Guoqing and asked: "Do you mean to use CAD drawings to draw the chip drawings, then connect the printer to print the mask with a laser?"

Zhao Guoqing shook his head and said: "This is only a part of it, a very small part!"

Traditional CAD software is just a tool to assist in drawing, but EDA is different. There is a profound physical definition behind the graphics, and the designed circuit has the conditions for simulation and various analyses.

"..."

"The paper "Introduction to VLSI Systems" published by Carver Mead and Lynn Conway four years ago proposed a new idea of ​​chip design through programming languages. . If this idea is realized, the complexity of chip design can be significantly improved. In fact, foreign research in this area has been very in-depth."

“In March this year, the Design Automation Conference also held the first sales exhibition with the theme of electronic design automation. It was reported in three full pages in the Semiconductor Herald. Professor Ji, you Didn’t you see it?”

"..."

Ji Hongbo was speechless. He really didn't look at it. He was a little embarrassed in front of such a young man. He had to look for it when he got back.

"Xiao Zhao, did you check all this knowledge yourself? By the way, I know you are from Xidian, who is your mentor?"

Tutors? Do undergraduate students have tutors?

"Professor Tian and others have given me lessons!"

"Tian Xiangrong?"

Zhao Guoqing nodded.

Ji Hongbo sighed softly. He still didn't know how Tian Xiangrong could teach such a weirdo like Zhao Guoqing.

If the gallium nitride field effect transistor is proven feasible, the scientific community in China will be shaken.

By the way, there is also this computer-aided design. He can't keep up with the young people's ideas.

With a creak, Gao Changming opened the door.

"The approval note issued by Director Liu is ready, we can leave! I called a car and will have breakfast outside later, and then go directly to Qingdao University."

This research base of AVIC is also confidential. Under normal circumstances, not even a small piece of paper is allowed to be taken out, and you have to be searched when you go out.

I found a state-owned restaurant and had a bowl of beef noodles per person. It was a full bowl with a large piece of beef on top. The price was not cheap, only one yuan a bowl.

"I'm treating you today. If you come to Jinling, come and see me. I'll take you to eat salted duck and lion's head!"

Ji Hongbo readily took out a ten-yuan bill and handed it to the waiter without forgetting to ask for a receipt.

"On National Day, CLP 14 is in Jinling, and Professor Ji is also taking classes at Tsinghua University, running both ways!"

"By the way, Professor Ji, National Day is also yours in Jiangsu Province!"

"What a coincidence, it's National Day, where are you from in Jiangsu Province?"

"Hong Ze!"

"It's a good place with a lot of water. We have agreed to meet me in Jinling during the National Day."

"good!"

After breakfast, we drove to the Microelectronics Research Center of Tsinghua University.

Gou Mingguang, deputy director of the Microelectronics Research Center, and He Zhenhua, associate professor, were already waiting outside.

"Professor Ji, Director Gao, Comrade Guo Qing, welcome you!"

Even Zhao Guoqing also shook hands.

Professor He Zhenhua was not as cold as last time. He was from that time and knew about light-emitting semiconductors.

"National Day, the design theory you provided last time has probably been verified. We found that the closer the doping and epitaxial layer thickness are to the design requirements, the higher the light efficiency..."

Ji Hongbo saw Zhao Guoqing talking to He Zhenhua, turned around and asked, "Do you know each other?"

Zhao Guoqing smiled: "Thanks to Professor He for helping me last time!"

He Zhenhua also smiled. The credit for this matter belongs to the Academy of Sciences, and the country has also notified the public. Although Ji Hongbo's rank is not low, it must be kept confidential.

Ji Hongbo saw that they didn't say anything and didn't ask any more questions.

When we got to the conference room, we started working directly.

Zhao Guoqing took out the drawing and handed it to He Zhenhua. He Zhenhua just took a look at it and said directly: "This is simple and can be done. It can be done today!"

People who are not familiar with it may not know it, but Zhao Guoqing knows it.

In fact, it is a triode-like structure, VMOS field-effect transistor, which has two types: PNP structure and NPN structure. Compared with light-emitting semiconductors, there is no need to distill magnesium atoms under vacuum conditions and then bombard magnesium atoms with electrons for doping. Then use the gallium nitride epitaxial layer to make the P level.

This time, gallium nitride crystal is directly used as the N-level material, and high-purity silicon doped with phosphorus is used as the P-level material. There is no need for long and difficult-to-detect magnesium atom distillation, nor electron gun bombardment.

Zhao Guoqing suddenly thought of a question.

"Professor He, how is this transistor packaged?"

"Imported epoxy resin is used, the process is relatively simple and the quality is good."

Zhao Guoqing frowned slightly. Transistors can be encapsulated with epoxy resin, but it is not suitable for chips. This thing gets hot. He asked again: "What process is used for chip cutting?"

Professor He said: "Before cutting, the automatic saw blade cutting machine imported by Japan's Nikon Company needs to be hung with imported protective glue, and finally chemically cleaned!"

Zhao Guoqing wanted to ask again, and He Zhenhua smiled and said: "Guo Qing, let's do this. When I do it, you can follow me in and take a look. If you have anything to ask, I'll ask you then."

Zhao Guoqing nodded as he was able to go in. The Institute of Microelectronics of Tsinghua University is considered the forefront of the country's most advanced chip manufacturing research.

Ji Hongbo stood up and said, "Okay, that's it. I'll go to the General Staff for National Day. Do you want to come with me?"

Zhao Guoqing shook his head. He didn't know which way to open the General Staff's door.

"Professor Ji, wait a moment, I need to use the drawings again."

"Professor He, please wait a moment!"

Zhao Guoqing walked out of the office, quickly went downstairs, got into the car, took out the drawings of the radar auxiliary computing chip, and unfolded them on the table.

"Professor He, would you like to see if Tsinghua University can make this chip?"

Ji Hongbo also had this question and looked at Professor He Zhenhua closely.

He Zhenhua looked at the drawings and looked up at Zhao Guoqing.

"Did you draw it?"

"Professor He, you don't care who drew it, just do it or not!"

“It can be done, but the manufacturing process cannot reach three microns!”

It was Zhao Guoqing's turn to be confused.

"I have read the newspapers from three years ago. The Institute of Microelectronics of Tsinghua University has manufactured a photolithography machine with a one-micron process, and the bulletin board at the door also introduced it. If it can be made with one micron, why can't it be made with three microns?"

"..."

"The photolithography machine can indeed achieve the accuracy, but the chip cannot be made with the one-micron process by the photolithography machine. National Day, you may not understand!"

"..."

I'm busy, but I want to improve your chip manufacturing process?

Zhao Guoqing collected the limited knowledge about chip manufacturing in his memory, and he didn't know if he could help.

“What process can be achieved now?”

"The maximum is five microns, but the quality is not guaranteed. The seven-micron process is considered relatively mature!"

"What does it mean to be relatively mature?"

“The yield rate can reach half!”

call!

Zhao Guoqing didn't know what to say. The yield rate was half, so it would only be used for military purposes. If it were used for commercial purposes, his pants would lose money.