Yuandong Alex Gu

A Low-Loss Hybrid Acoustic Bandpass Filter with Continuously Tunable Fractional Bandwidth

Xianli Tang, Yonghao Jia, Yuandong Alex Gu

This research proposes a low-loss hybrid acoustic bandpass filter with continuously tunable fractional bandwidth. A reconfigurable acoustic-wave-lumped-element resonator (AWLR) module with a varactor diode is studied. Based on the reconfigurable AWLR modules, two ladder-type tunable filters, including a single-series/single-shunt configuration (Type I) …

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Equivalent Circuit Extraction of SAW Resonator with Spurious Modes Interference over a −55 °C to 85 °C Temperature Range

Xianli Tang, Yonghao Jia, Yuandong Alex Gu

Surface acoustic wave (SAW) resonators are widely employed to design radio-frequency (RF) filters in wireless communication. To adapt to various application scenarios, the article proposes an equivalent circuit model based on the Butterworth–Van Dyke (BVD) model for SAW devices operating with spurious …

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Design, Fabrication, and Characterization of Mode-switchable Multi-frequency PMUT Based on a Single Chip

Yong Chen, Xinrui Shen, Haochen Lyu, Haolin Yang et autres

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CWM: An Open-Weights LLM for Research on Code Generation with World Models

FAIR CodeGen team, Jade Copet, Quentin Carbonneaux, Gal Cohen et autres

We release Code World Model (CWM), a 32-billion-parameter open-weights LLM, to advance research on code generation with world models. To improve code understanding beyond what can be learned from training on static code alone, we mid-train CWM on a large amount of …

Control of Abnormally Oriented Grains (AOG) in Al x Sc 1–x N Bimorph Stack and Characterization of Piezoelectric Properties on an 8-in Wafer

Yucheng Ji, Ruqiang Yan, Songsong Zhang, Yuandong Alex Gu

Piezoelectric MEMS devices based on bimorph scandium-doped aluminum nitride (AlScN) exhibit greater performance potential than those based on unimorph structures. In this paper, we present an optimized bimorph stack utilizing AlxSc${}_{1-\text {x}}$N on an 8-inch silicon wafer. The control of abnormally oriented …

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Systematic Investigation of Wafer-Level Performance in AlScN-Based PMUTs

Yucheng Ji, Minglang Li, Yong Chen, Songsong Zhang et autres

The systematic investigation of wafer-level performance in AlScN-based PMUTs is crucial for high-yield mass production and application development. In this work, pinned structures with 600 μm and 1000 μm diaphragm diameters (Pinned 600U, Pinned 1000U) were prepared based on an 8-inch SOI …

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Investigation of quasi-Sezawa mode for enhanced electromechanical coupling coefficient in AlN/Sapphire SAW resonators with periodic trench dielectric layer

Huiling Liu, Hao Sun, Xiuli Gao, Xian Wang et autres

Abstract This study enhances the performance of traditional AlN/sapphire surface acoustic wave (SAW) resonators for high-frequency filters and high-temperature sensors by addressing limitations in the moderate electromechanical coupling coefficient ( K 2 ) and low phase velocity ( V p ). A …

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Abnormal Oriented Grains(AOG) Controlled of AlxSc1-xN Bimorph Stack and Piezoelectric Properties Characterization at 8-inch Wafer

Yucheng Ji, Ruqiang Yan, Songsong Zhang, Yuandong Alex Gu

In this paper, we present an optimization of a bimorph stack utilizing AlxSc1-xN on an 8-inch silicon wafer. The control of abnormally oriented grains (AOG) was achieved by incorporating Al0.9Sc0.1N and Al0.8Sc0.2N composite films. The capacitance (C0) and piezoelectric coefficients (d33) of …

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Dual-Channel Wafer Defect Segmentation and Classification Algorithm Based on Adaptive Data Augumentation

Wei Zhao, Yuandong Alex Gu, Yong kang Liu, Ruixiang Yan et autres

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Research on optical proximity correction with embedded coordinate convolution module

Yongkang Liu, Wei Dong Zhao, Kai Ni, Yuandong Alex Gu et autres

As the chip size continues to decrease, the feature size of transistor is getting closer to the optical diffraction limit. When performing the lithography process, the optical proximity effect exists due to the mismatch between the exposure wavelength and the critical dimension …

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Improved Performance of Acoustically Actuated Magnetoelectric Antenna with FeGa/FeGaB Bilayer

K.Y. Li, Qiaozhen Zhang, Yang Chang, Jian Wang et autres

Acoustically actuated magnetoelectric (ME) antennas utilize acoustic wave resonance to complete the process of receiving and transmitting signals, which promotes the development of antenna miniaturization technology. This paper presents a bilayer magnetostrictive/AlN ME laminated antenna. The proposed laminated antenna uses the FeGa/FeGaB …

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Effect of humid environment on electromechanical performance of piezoelectric micromachined ultrasonic transducers (PMUTs)

Zhihao Tong, Zhipeng Wu, Yuandong Alex Gu, Liang Lou

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