Design of a 5-17 GHz Wideband GaAs Low Noise Amplifier with Capacitive Feedback
Received: 9 March 2025 | Revised: 5 April 2025 | Accepted: 19 April 2025 | Online: 4 June 2025
Corresponding author: K. Sowjanya
Abstract
This paper presents a two-stage broadband Low Noise Amplifier (LNA) that uses a matching network and source degeneration technique, combined with Capacitive Feedback (CFB). The novelty of the design is the integration of CFB and source degeneration, in order to achieve a flat, wideband gain while maintaining a low Noise Figure (NF). The proposed LNA has its foundation in GaAs pHEMT technology and is simulated using the Keysight ADS software. The simulation results demonstrate that the LNA delivers a consistent gain of 23 dB and NF below 1.016 dB, while maintaining excellent input and output reflection coefficients of <-8 dB, across the operating range of 5 - 17 GHz.
Keywords:
LNA, pHEMT, Noise Figure (NF), two-stage, capacitive feedbackDownloads
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Copyright (c) 2025 K. Sowjanya, Paramesha, P. Shanthi, K. Sreelakshmi
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