Home > Published Issues > 2024 > Volume 13, No. 4, July 2024 >
IJEETC 2024 Vol.13(4): 293-303
doi: 10.18178/ijeetc.13.4.293-303

A Variable-Gain Low-Noise Amplifier for MedRadio Band Applications

Mutanizam Abdul Mubin1, Mohd Tafir Mustaffa1,*, and Arjuna Marzuki2
1. School of Electrical and Electronic Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Malaysia
2. School of Science and Technology, Wawasan Open University, 10050 George Town, Malaysia
Email: mutanizam@student.usm.my (M.A.M.), tafir@usm.my (M.T.M.), arjunam@wou.edu.my (A.M.)
*Corresponding author

Manuscript received January 8, 2024; revised April 3, 2024; accepted April 18, 2024.

Abstract—A variable-gain 0.18 μm Complementary Metal- Oxide-Semiconductor (CMOS) Low-Noise Amplifier (LNA) for Medical Device Radiocommunications Service (MedRadio) applications has been designed and verified through simulations in Cadence IC5 with Silterra’s C18G CMOS technology Process Design Kit. Unlike other MedRadio LNAs from previous works, this proposed LNA can vary its gain from just above 10 dB to nearly 30 dB. It consists of three stages; the input-matching stage, the interstage buffer, and the gain-varying stage. The input-matching stage provides an input impedance match and drives the initial gain of the LNA. The inter-stage buffer isolates the input-matching stage from the gain-varying stage. The overall gain of the LNA can be varied and is determined by the variable biasing of the driving transistors of the gainvarying stage. On post-layout simulations with a sourcefollower output buffer, this LNA exhibits a wide-ranging gain from 11.2 dB at 0.49 mW DC power consumption to 29.1 dB at 1.34 mW DC power consumption.

Index Terms—Low-Noise Amplifier (LNA), Medical Device Radiocommunications Service (MedRadio), variable-gain

Cite: Mutanizam Abdul Mubin, Mohd Tafir Mustaffa, and Arjuna Marzuki, "A Variable-Gain Low-Noise Amplifier for MedRadio Band Applications," International Journal of Electrical and Electronic Engineering & Telecommunications, Vol. 13, No. 4, pp. 293-303, 2024. doi: 10.18178/ijeetc.13.4.293-303

Copyright © 2024 by the authors. This is an open access article distributed under the Creative Commons Attribution License (CC BY-NC-ND 4.0), which permits use, distribution and reproduction in any medium, provided that the article is properly cited, the use is non-commercial and no modifications or adaptations are made.