2025-02-04T12:49:43+08:002025-02-04|新闻与活动, 活动信息|

The Distinguished Lecture on “SAW-less Multi-Band RF Transmitters Based on N-Path Filtering Modulation Techniques” will take place as follows:

Date: 07 February 2025 (Friday)

Time: 14:30 – 16:00

Venue: Research Building N21, G013 

The speaker is:

Prof. QI Gengzhen, Associate Professor, School of Microelectronics Science and Technology, Sun Yat-Sen University, Guangdong, China

The Lecture is:

SAW-less Multi-Band RF Transmitters Based on N-Path Filtering Modulation Techniques

 

Abstract:

For 5G-New Radio (NR) frequency-division duplexing (FDD) operation, the radio-frequency (RF) systems have been challenged to provide both high-quality in-band signal and low out-of-band (OB) emission (i.e., spurs and noise). Therefore, surface-acoustic wave (SAW) filters are always employed in the RF front-ends to provide adequate suppression on both high-power transmitted signal (e.g., causing gain compression of the receiver) and transmitter-generated OB noise (e.g., de-sensitizing the receiver). However, SAW filters cannot be scaled well and significantly increase the cost of the system. The N-path filtering technique is becoming a promising technique to replace the SAW filters. For transmitters, by combining the N-path filter and modulator, we can obtain the N-path filtering modulator, which enables center-frequency-defined high-Q bandpass filtering at a flexible RF, thus rejecting the OB noises in baseband and the modulator. The transmitters based on N-path filtering modulator can achieve a consistently low OB noise (≤-156dBc/Hz) for a wide RF range. Under a >2dBm output power, the transmitters show a high transmitter efficiency (>3.5%) and a high linearity (CIM3 <-50dBc and ACLR1 <-40dBc).

 

Biography:

Prof. QI Gengzhen (M’19-SM’24) received the B.S. and the M.S. degrees in electrical and electronics engineering from the University of Macau (UM), Macao SAR, China, in 2011 and 2013, respectively, and received the Ph.D. degree in electrical and computer engineering from UM in 2018. After that, he worked as a post-doctoral fellow with the State-Key Laboratory of Analog and Mixed-Signal VLSI, UM, until 2020. He is currently an Associate Professor with the School of Microelectronics Science and Technology (MST), Sun Yat-Sen University (SYSU), Guangdong, China. His research interests are on CMOS RF integrated circuits for wireless communication, including transmitters, receivers, power amplifiers and front-end modules. He did research on RF tunable front-end module design in CMOS SOI technology in imec, Leuven, Belgium, for one year in 2016.

 

For more details, kindly find the event poster, abstract and bio.