At the age of 26, he had just graduated and was hired as an associate professor by the school.
Just because his research in the field of chips is really outstanding: independent research and development of millimeter wave communication chips.
His name is Zhang Zhiwei and he is currently working at Hangzhou Dianzi University.
But this "two or three sesame-sized" chip is enough to meet the transmission rate requirements of 5G or even 6G communication. In Zhang Zhiwei's own words:
The power is higher and the transmission distance is longer.
In the past, the coverage area was only half the size of a football field. Now the latest experimental results can transmit 10 kilometers.
For ordinary people, the (video) telephony will be clearer and the Internet access rate will be higher.
More importantly, millimeter-wave chips have long been monopolized by foreign countries. However, with the successful development of Zhang Zhiwei and his team, his mentor believes that:
In some areas, it should be able to no longer rely on foreign chips, which solves the problem of "stuck neck"
It is understood that the chip has been used in mobile base stations, which can realize high-speed transmission of large amounts of data between satellites and ground base stations, and between base stations and base stations.
Once the news was announced, it immediately aroused the attention of a large number of netizens:
Many netizens congratulated and praised Zhang Zhiwei for his breakthrough achievements, but they fell into "deep thinking" about Zhang Zhiwei's ability to become an associate professor at the age of 26:
But in addition to the results themselves, Zhang Zhiwei's previous study and research and development experience has also become the focus of this heated discussion.
Declined an annual salary of 600,000 yuan and chose to stay in school to teach
Zhang Zhiwei studied at Hangzhou Dianzi University. The main research direction is microwave/millimeter wave , which is closely related to 5G/6G communication.
And he decided to develop chips, but also from an undergraduate experience.
At that time, Zhang Zhiwei was participating in the competition, but ended 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.
To this end, he deliberately went abroad for further study in 2020, insisting on doing research for up to 12 hours a day.
Perhaps it is Zhang Zhiwei's hard work and hard work. From 2020 to 2021, he won 2 firsts in the chip field:
- First proposed hybrid EFJ power amplifier
- The concept of impedance frequency modulation was first proposed
Even his tutors abroad commented on it - "It did not live up to your alma mater".
And these "performances" also laid a solid foundation for Zhang Zhiwei on the road of core making.
In March this year, Zhang Zhiwei successfully completed the defense of his doctoral dissertation.
But at that time he was faced with a choice between two -
Either go to a big factory or stay in school.
Even though many big factories offered him an offer with an annual salary of 600,000 yuan, Zhang Zhiwei resolutely chose to stay in school.
According to the description of "China Science News", Zhang Zhiwei chose to stay at the school to teach because:
Because I like the free and "creative" atmosphere of the campus.
Such a choice also made Zhang Zhiwei a "debut is the pinnacle" in the mouths of netizens, and became a distinguished associate professor as soon as he graduated .
Shen Dongsheng, a counselor of Hangzhou Electric Power Co., Ltd., believes:
In recent years, the school's talent recruitment requirements have risen, and it is indeed not easy to become a special-term associate professor after graduation.
But under such a halo, Zhang Zhiwei's hard work and hard work are indispensable.
Published 19 SCI papers
According to the on-site publicity materials for the selection of "Top Ten College Students" by Hangzhou Dianzi University in 2022, Zhang Zhiwei published a total of 19 SCI papers during the 5-year consecutive study of master and doctoral degree .
He has published more than 10 SCI papers as the first author, 9 of which are published in IEEE Society journals.
These papers, of course, also include research papers that propose hybrid EFJ power amplifiers, as well as impedance frequency modulation.
In 2020, under the guidance of his mentor Cheng Zhiqun and others, Zhang Zhiwei developed a new hybrid continuous-stage EFJ power amplifier to amplify the carrier.
Previously, Doherty Power Amplifiers (DPAs) were widely used in base stations due to their simple structure and low cost. But traditional DPA has some inherent shortcomings, such as: narrow bandwidth, and only 6dB output back-off range.
The load impedance of the EFJ class power amplifier proposed by Zhang Zhiwei and his team not only has a variable imaginary part similar to the traditional continuous power amplifier, but also has an inconsistent real part.
Therefore, the EFJ class power amplifier can effectively combine the high energy efficiency of the EF class power amplifier and the large bandwidth of the continuous class J power amplifier under certain conditions, thus greatly making up for the defects of the DPA.
In 2021, Zhang Zhiwei and Vincent Fusco from Queen's University Belfast, UK, and others published a research paper on impedance frequency modulation in IEEE Transactions on Circuits and Systems II.
This is a new way of designing multi-band power amplifiers: using a coupler as the output circuit of the amplifier to achieve multi-band impedance transformation.
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| Coupler |
By combining the obtained periodic impedance traces with the impedance space of the EFJ class power amplifier, real-time acquisition of the desired operating frequency is achieved.
At present, Zhang Zhiwei and his team are studying the technical iteration of version 3.0 of the millimeter wave communication chip.
Zhang Zhiwei said:
It is hoped that our research results can realize the replacement of domestic chips.
Some people also think from the perspective of the school that "professor's salary is too low":
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