Military Industry of Great Powers: Build the Strongest Flanker

Liang Zhujin went to the UK, not surprisingly, as a member of the expert team negotiating with Rolls-Royce.

Zhao Guoqing didn't ask. China's military exchanges with the West did not limit cooperation partners to the Yingjiang family, just like eggs cannot be put in one basket.

What worries Zhao Guoqing is that the three months are coming soon. How is Tu Jinda doing? The down payment for the "Pearl of Peace" plan is 200 million U.S. dollars. You shouldn't make a decision so quickly!

Fortunately, good news came from Tsinghua University, and the chip tape-out was successful.

There are thousands of transistors on one chip, so ADC and DAC chips are more complicated. There are several different types of transistors in the analog digital chip, including three-pole gallium nitride transistors and ordinary PN junction transistors. It needs to be completed in dozens of steps. Others only need three. Four steps of light and etching.

Moreover, after the chip is manufactured, the completion of the chip can be manually inspected through an electron microscope to see if there are any defects. For a chip with thousands of transistors, three or four can be inspected in half a day. This also greatly guarantees the quality of the chip. Of course, this is also The scale of the chip is relatively small, so the primitive method of manpower can be used.

When the scale of chips reaches hundreds of millions, manual microscopic inspection will lose any meaning. For this reason, a special discipline called chip detection science was born.

As for such a chip scale, the method Zhao Guoqing currently uses to rub the processor by hand would not take a hundred years to draw the blueprints, so it can only be designed through a computer.

As for chip inspection, in addition to visual inspection of defects, power-on inspection is essential.

These chips are also designed with side branch detection circuits to test whether each module in the chip is working normally.

The testing of ADC and DAC chips is a lot more troublesome. It needs to test the tolerance of high voltage and whether the high voltage current can be controlled by low voltage.

It took most of the day to conduct the test. The physical inspection of the chip showed no problems, and the circuit test yielded a 90% good product rate. But I don’t know what the yield rate of a wafer can be when cutting?

"Professor He, the manufacturing technology of Tsinghua University Microelectronics is becoming more and more mature!"

He Zhenhua shook his head and said, "Mr. Zhao, come over sometime to help us solve the one-micron process. The etching, light source, calibration, workbench and mask have all been replaced, but the success rate is still not high."

"Have you trial-produced a one-micron process? What kind of chips are you making? What's the yield rate?"

"I originally wanted to use a one-micron process to make chips for you..."

It seems that it was not successful!

A 462-nanometer ultraviolet light source can produce wafers up to 600 nanometers. Logically speaking, the one-micron process is far from reaching its limit.

"Why don't we try the 1.5 micron process first? As the process improves, these photolithography and etching processes cannot be used in many cases using the old method."

Zhao Guoqing still suggested proceeding step by step, but He Zhenhua did not speak, obviously not recognizing what Zhao Guoqing said.

"Teacher Zhao, can the immersion lithography you mentioned solve the one-micron process?"

"..."

"Professor He, there are many problems that need to be solved in immersion lithography. You have to think about how to prevent the infiltration solution from contaminating the operating table, and the photoresist that does not change its properties when exposed to water. Even after etching, how can you remove the contaminated crystal? Yuan cleansing to a high clean state?"

This is simply overthinking. If any of these problems cannot be solved, there will be no chance. Zhao Guoqing can feel that He Zhenhua is a little impetuous and eager to get things done.

Zhao Guoqing had no time to talk nonsense with He Zhenhua about the lack of a shadow, so he said hello and got directly into the jeep parked at the entrance of the Microelectronics Center of Tsinghua University.

In the base testing workshop, Factory 207 PCB circuit board engineer Hong Min felt a little uneasy. The integrated circuit boards for the Eagle Eye project were all made by their factory, especially the double-layer circuit boards. This was their first time making them. Although they had passed the extreme test, The current redundancy reaches more than 80%, but there is no final assembly test and it always feels unstable.

beep... beep...

"General Master Zhao is back!"

Before Zhao Guoqing got out of the car, a large group of people gathered around him, and everyone's eyes were extremely enthusiastic.

"General Master Zhao, is everything going well?"

"General Master Zhao, is the chip ready?"

Zhao Guoqing nodded. Jia Pengfei next to him was holding a wooden box in his hand. He has never put it down from the Microelectronics Center of Tsinghua University until now. Even the driver Xiao Sun is very careful when driving, and he is reluctant to cover any small pit. Going up, it was supposed to be a half-hour drive, but it took more than an hour.

Ji Hongbo stepped forward and patted Zhao Guoqing on the shoulder and said: "National Day, thank you for your hard work!"

Zhao Guoqing smiled and said, "You must have been waiting for a long time!"

"It doesn't take long!"

Ji Hongbo's eyes were bloodshot. Even though he had seen strong winds and waves, he couldn't calm down at this moment. He didn't sleep well last night.

Gu Yuzhou, a senior electrician at Factory 207, wearing gloves, a hat and a mask, carefully took the chip out of the box, attached the copper spine heat sink, inserted the chip pins into the reserved holes according to the model number, and then used a soldering iron to Carefully solder the chip to the PCB.

Unrelated personnel could only watch from a distance. As soon as the last pin was welded and Master Gu put the soldering iron back in place, applause could be heard sparsely in the venue, and the sound became louder and louder.

Ji Hongbo pressed his hands with a serious look on his face and said, "The power-on test was successful. It's not too late to celebrate!"

He subconsciously looked at Zhao Guoqing. Teacher Zhao was talking to Hong Min, the chief engineer of Factory 207, like a normal person.

"The tantalum capacitors, solid aluminum electrolyte capacitors, and ferrite induction coils on the circuit board are all imported. The copper wires on the circuit board are thickened by 0.2 mm in accordance with aviation specifications..."

Zhao Guoqing thought about it and found that there were no omissions. The person in charge of each sub-item had also checked it and reported that there was nothing wrong.

Tong Yihong, the chief engineer of the test, stepped forward and said: "General Engineer Zhao, Chief Engineer Ji, the test antenna has been arranged, the radar equipment is checked normally, and the power supply voltage and frequency are normal. There are three test contents: test whether the sending and receiving radar waves are normal, test search, Whether the locking function is normal, whether the test beam distribution is normal, whether to test now, please indicate!"

"test!"

The radar test workshop is a semi-open workshop, with

Tong Yihong made a sound to prepare for the test. Within a range of 60 degrees to the left and right in front of the two TV-sized radar prototypes, personnel quickly withdrew. There were soldiers guarding the dangerous area to prevent other personnel from accidentally intruding.

Because X-waves are microwaves, if they shine on a person, it will be like putting the person in a microwave oven and will cause irreversible damage. However, you don’t need to pay attention to the radar echo. The radiation energy is too small to cause harm to the human body.

"Seat No. 1 is ready!"

"Seat 2 is ready!"

…

"Position 9 is ready!"

With all observation positions in place, Tong Yihong pressed the power switch.

Zhao Guoqing heard a slight sound of electricity, and each indicator light gradually turned on. Each light turned on, which represented that the radar had completed a warm-up process.

When the power is turned on, the computer will immediately check whether the main circuit is normal, whether the bypass circuit is normal, and whether the storage and memory chips are normal. After the detection is completed, the main program of the fire control system is retrieved from the Flash ROM. As the last blue light turns on Up, Zhao Guoqing also breathed a sigh of relief.

"Report to Commander Zhao that the computer started successfully and is working normally!"

"Proceed to the next step and start the search process!"