1. Analysis and Design of a 2-40.5 GHz Low Noise Amplifier With Multiple Bandwidth Expansion Techniques
- Author
-
Jiaxuan Li, Jialong Zeng, Yang Yuan, Ding He, Jingxin Fan, Cheng Tan, and Zhongjun Yu
- Subjects
Bandwidth expansion ,broadband amplifier ,gain roll-off of the transistor ,monolithic microwave integrated circuit (MMIC) ,low-noise amplifier (LNA) ,parasitic capacitance ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
This paper analyzes the main factors limiting the bandwidth expansion of low-noise amplifiers (LNA) and designs a broadband LNA with a bandwidth of 2-40.5 GHz. The LNA is designed using multiple bandwidth expansion methods, including cascode, resistance feedback, and cascode Darlington amplifier. The amplitude-frequency characteristics and bandwidth expansion principle of the three structures are studied theoretically based on the small-signal equivalent circuit model. Thanks to these techniques, a three-stage LNA is designed in a 0.15- $\mu \text{m}$ GaAs pseudomorphic high-electron-mobility (pHEMT) process. The measured results show that the designed LNA achieves an average gain of 21.6 dB in 2-40.5 GHz while maintaining a noise figure (NF) below 3.6 dB. The measured output 1-dB gain compression point (OP1 dB) is from 4.5 to 12.8 dBm and the input/output return loss are better than 5 dB. The chip area is only 1.57 mm2, including input and output test pads.
- Published
- 2023
- Full Text
- View/download PDF