At the age of 26, he had just graduated and was employed as an associate professor by the University. Only because his research in the field of chips is too prominent: he independently develops millimeter wave communication chips. His name is zhangzhiwei. He is currently working at Hangzhou University of Electronic Science and technology. This chip, which is "twoorthree sesame seeds in size", can meet the demand of 5g or even 6G communication for transmission rate. In zhangzhiwei's own words, the power is higher and the transmission distance is larger.
▲ source: China blue news
In the past, the coverage area was only half the size of a football field. Now, the latest experimental results can spread for 10 kilometers.
For ordinary people, the (video) telephone will be clearer and the Internet speed will be higher.
▲ source: China blue news
More importantly, millimeter wave chips have long been monopolized by foreign countries. However, with the successful R & D of zhangzhiwei and his team, his tutor believes that:
In some fields, it should be able to no longer rely on foreign chips and solve the "neck sticking" problem
It is understood that the chip has been applied to mobile base stations, which can realize the high-speed transmission of large amount of data between satellite and ground base stations, and between base stations.
Once this news was released, it immediately attracted the high attention of a large number of netizens:
Even Zhang Zhiwei's alma mater, Hangzhou University of Electronic Science and technology, sent a "congratulatory message":
Many netizens, while congratulating and praising Zhang Zhiwei for his breakthrough achievements, fell into "deep thinking" about Zhang Zhiwei becoming an associate professor at the age of 26:
However, in addition to the achievements themselves, Zhang Zhiwei's previous study and R & D experience has also become the focus of this heated discussion.
Declined the annual salary of 600000 yuan and chose to stay in school as a teacher
Zhangzhiwei studied at Hangzhou University of Electronic Science and technology. The main research direction is microwave / millimeter wave, which is closely related to 5g / 6G communication.
When he decided to develop chips, he had to start with his undergraduate experience.
At that time, zhangzhiwei was taking part in the competition, but ended up in failure. The reason is that the chip used by Zhang Zhiwei failed during the competition.
Therefore, the matter of "making cores" was deeply buried in his heart.
For this reason, in 2020, he specially went abroad for further study and insisted on doing research for up to 12 hours every day.
Perhaps it is zhangzhiwei's efforts and hard work that has won two firsts in the chip field from 2020 to 2021:
-Hybrid efj power amplifier proposed for the first time
-The concept of impedance frequency modulation is proposed for the first time
Even his tutors abroad commented on him that "you have lived up to your alma mater".
These "achievements" also laid a solid foundation for Zhang Zhiwei on the later road of core building.
In March this year, zhangzhiwei successfully completed his doctoral thesis defense.
But at that time, he was faced with the choice between two——
Either go to a big factory or stay in school.
Even though many big factories offered him offers with an annual salary of 600000 yuan, Zhang Zhiwei resolutely chose to stay in school.
▲ figure source: Official Website of Hangzhou University of Electronic Science and technology
According to the description of China Science Daily, the reasons why zhangzhiwei chose to stay in school as a teacher are as follows:
Because I like the free and creative atmosphere on campus.
This choice has also made zhangzhiwei a "debut is the peak" in the words of netizens, and he became a distinguished associate professor upon graduation.
Shendongsheng, a counselor of Hangzhou electric power, believes that:
In recent years, the requirements for the recruitment of talents in the University have risen. It is really not easy to become a distinguished associate professor upon graduation.
But under this aura, what is indispensable is Zhang Zhiwei's hard work and efforts.
Published 19 SCI papers
According to the on-site publicity materials for the 2022 "top ten college students" selection of Hangzhou University of Electronic Science and technology, Zhang Zhiwei has published 19 SCI papers in the five years of continuous reading of master's degree and doctoral degree.
He has published more than 10 SCI papers as the first author, 9 of which have been published in journals under the IEEE Association.
Of course, these papers also include the research results of hybrid efj power amplifier and impedance frequency modulation.
In 2020, under the guidance of his tutor chengzhiqun and others, zhangzhiwei developed a new hybrid continuous stage efj power amplifier to amplify the carrier wave.
Previously, Doherty power amplifier (DPA) was widely used in base stations due to its simple structure and low cost. However, traditional DPA has some inherent disadvantages, such as narrow bandwidth and only 6dB output back-off range.
The load impedance of efj power amplifier proposed by Zhang Zhiwei and his team not only has the variable imaginary part similar to the traditional continuous power amplifier, but also has inconsistent real part.
Therefore, efj class power amplifier can effectively combine the high energy efficiency of EF class power amplifier and the large bandwidth of continuous J class power amplifier under specific conditions, thus greatly making up for the defects of DPA.
In 2021, zhangzhiwei, Vincent Fusco from Queen's University of Belfast, UK, and others published a research paper on impedance frequency modulation on IEEE Transactions on circuits and systems II.
This is a new method to design multi band power amplifier: a coupler is used as the output circuit of the amplifier to realize multi band impedance conversion.
▲ coupler
By combining the obtained periodic impedance trace with the impedance space of efj power amplifier, the required operating frequency can be obtained in real time.
……
At present, zhangzhiwei and his team are studying the technical iteration of millimeter wave communication chip version 3.0.
Zhangzhiwei said:
It is hoped that our research results can realize the replacement of domestic chips.
One More Thing
Zhang Zhiwei's refusal to stay in school with an annual salary of 600000 triggered a heated debate. In addition to the contents mentioned above, there is another voice.
Some people think that the annual salary of 600000 yuan offered by Dachang to zhangzhiwei is not very high:
Before, the Internet casually gave a fresh student 400000 +
From the perspective of schools, some people think that "the salary of professors is too low":
So what do you think of this?
Paper link:
[1]
[2]