A 0.1-3.2 GHz Reconfigurable LPF With Peaking Reducing and Selectivity Enhancement Using Adaptive Impedance Transformation

• Published in: 2024 IEEE/MTT-S International Microwave Symposium - IMS 2024 pp. 953 - 956
• Main Authors: Cheng, Xu, Rao, Yunbo, Luo, Xianhu, Zhang, Liang, Han, Jiangan, Wu, Rui, Tang, Haibo, Liang, Xingdong, Deng, Xianjin, Gao, Hao
• Format: Conference Proceeding
• Language: English
• Published: IEEE 16.06.2024
• Subjects: Adaptive impedance transformation (AIT); BiCMOS integrated circuits; Cognitive radio; Heterojunction bipolar transistors; Impedance; low-pass filter (LPF); Microwave filters; on-chip; Passband; peaking reducing; selectivity enhancement; Topology

This paper presents an on-chip low-pass filter (LPF) for cognitive radio in a 130-nm SiGe BiCMOS technology. The LPF achieves a broad tuning range of 0.1-3.2 GHz with a 100 MHz step. To address gain variation caused by the frequency peaking effect, we propose an adaptive impedance transformation (AI...