Speaker Information
Xingyong Jiang
Deputy General Manager of R&D Center, ROFS (Tianjin) Microsystem Technology Co., Ltd.
Wei Zhang
Senior Engineer, ROFS (Tianjin) Microsystem Technology Co., Ltd.
Abstract
In recent years, with the widespread adoption of 5G frequency bands, stringent requirements have emerged for filters to suppress signals above 3GHz. However, bulk acoustic wave (BAW) filters exhibit inherent characteristics that cause significant parasitic effects at 3rd harmonics, leading to deteriorated out-of-band suppression. A conventional solution involves connecting a low-pass filter in series to suppress high-frequency signals. Yet this approach compromises another critical metric: insertion loss. In this paper, a new design and process collaborative optimization scheme is proposed. Under the condition of keeping the fundamental frequency resonance frequency unchanged, the parallel third-order parasitic resonance frequency is shifted upward to the third-order series parasitic frequency, so as to significantly suppress the parasitic spikes while maintaining the passband performance. We used the new technology to make a Band 5 Tx (824–849 MHz) BAW filter, which has an insertion loss of less than 0.5 dB and a peak out-of-band suppression at the 3rd harmonics (2.5-3GHz) reduced to below 23dB.
Speaker Biographies
Xingyong Jiang serves as the Deputy General Manager of R&D Center at ROFS (Tianjin) Microsystem Technology Co., Ltd. He holds a master's degree from the University of Texas, USA, and is in charge of the R&D of product and process technology, with over 25 years of research experience in the radio frequency (RF) field and more than 10 years of work experience in the acoustic RF filter field.
Wei Zhang received Ph.D. degrees from the Institute of Microelectronics at the Chinese Academy of Sciences in 2015. He is currently a senior engineer at Rofs Microsystem (Tianjin) co., Ltd, leads R&D efforts for bulk acoustic wave resonator devices. His research spans multiple technological frontiers, including N-type IBC solar cells, 40nm poly-gate integrated circuit, and 28nm high-K Metal Gate integrated circuit.
Research Focus Areas:
- Bulk Acoustic Wave (BAW) filter design and optimization
- Third harmonic suppression technologies
- Design and process collaborative optimization
- 5G RF filter development
- Acoustic RF filter technology advancement
- High-frequency signal processing and suppression