Document Type : Original Research Paper

Authors

• Abolfazl Bijari ¹
• Fereshte Khoshbinahmadi ²
• Mohammad-Amin Mallaki ²

¹ Deptartment of Electrical Engineering, Faculty of Electrical and Computer Engineering, University of Birjand, Birjand, Iran.

² Department of Electronics, Faculty of Electrical and Computer Engineering, University of Birjand, Birjand, Iran.

Abstract

Background and Objectives: Low-power wireless sensor network (WSN) receivers require LNAs with adequate gain, low noise figure, acceptable linearity, and reliable input matching under a strict power budget. This work aims to present a new sub-mW 2.4-GHz CMOS LNA architecture for WSN receiver front ends.
Methods: The proposed 180-nm CMOS LNA employs a single-stage CG/CS architecture that combines current-reuse, noise-cancelling, and gm-boosting techniques. The gm-boosted CG path provides low-power input matching, while the CS path suppresses noise and enhances gain. This complementary PMOS-NMOS current-reuse structure improves transconductance efficiency and achieves an optimized power-performance tradeoff without multi-stage overhead.
Results: Post-layout simulation results at 2.4 GHz show that the proposed LNA achieves a power gain (S21) of 11.9 dB, a noise figure of 3.7 dB, and an input third-order intercept point of -4 dBm. The circuit consumes only 0.99 mW at a supply voltage of 1.8 V, with an occupied active area of 0.394 mm2. The input return loss is better than -11 dB, confirming acceptable impedance matching at the operating frequency.
Conclusion: The proposed LNA demonstrates that the presented current-reuse noise-cancelling architecture can achieve sub-mW operation while maintaining suitable RF performance for 2.4-GHz WSN applications. By embedding noise cancellation and transconductance enhancement into a compact common-gate/common-source topology, the circuit provides an effective solution for low-power CMOS receiver front ends and demonstrates an effective tradeoff among gain, noise performance, input matching, linearity, and power dissipation.

Keywords

• Low-noise amplifier (LNA)
• Current-reuse
• Noise cancellation
• Gm-boosting
• Wireless sensor networks (WSNs)

Main Subjects

• Analogue Integrated Circuits

Open Access

This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit: http://creativecommons.org/licenses/by/4.0/

 

Publisher’s Note

JECEI Publisher remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

 

Publisher

Shahid Rajaee Teacher Training University