Pole-converging intrastage bandwidth extension technique for wideband amplifiers

• Main Authors: Feng, Guangyin, Boon, Chirn Chye, Meng, Fanyi, Yi, Xiang, Yang, Kaituo, Li, Chenyang, Luong, Howard C.
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2020
• Subjects: Engineering::Electrical and electronic engineering; Broadband Amplifiers; Bandwidth Extension
• Online Access: https://hdl.handle.net/10356/144783
• Institution: Nanyang Technological University

To overcome limitations on bandwidth extension in conventional design techniques, a novel pole-converging technique with transformer feedback for intrastage bandwidth extension is proposed and analyzed in this paper. For verification, a three-stage cascode low-noise amplifier (LNA) based on the pole converging and negative drain-source transformer feedback is designed and implemented in a 65-nm CMOS technology. Consuming 27 mW dc power from a 1.8 V supply, the fabricated prototype exhibits peak power gain of 18.5 dB, minimum noise figure of 5.5 dB, 3-dB bandwidth of 30 GHz, and fractional bandwidth of 38.7%. The bandwidth of the three-stage cascode LNA is significantly extended without increasing power consumption and die size.