Date of Graduation

5-2024

Document Type

Thesis

Degree Name

Bachelor of Science in Electrical Engineering

Degree Level

Undergraduate

Department

Electrical Engineering

Advisor/Mentor

Dix, Jeff

Abstract

More devices than ever are being used to connect to the internet via Wi-Fi than ever before. This creates the demand for improving Wi-Fi standards and wireless transceivers. On of the most important stages of a Wi-Fi receiver is the low noise amplifier (LNA), this is because it is the very first stage after the antenna receives the signal. The LNA is responsible for boasting the incoming signal while adding a low amount of noise to boast the signal enough to make it receptible to the rest of the receiver system. This study sought to design an inductively degenerated common source (CS) LNA to operate within the 5GHz band from 5.15 to 5.85GHz.

This study accomplished this by first simulating the design using ideal components and then changing the ideal passive components to non-ideal components that account for their parasitic values while running parametric sweeps to change values to achieve the desired results. This study designed an LNA that had a noise figure of 0.787dB, a S11 of -22.1dB, a S21 20.0 dB and a power gain of 20dB at 5.5GHz. However, the -3dB bandwidth achieved was only from 5.32 to 5.64 GHz which is a bandwidth of 302MHz instead of 700 MHz that was desired. The bandwidth for S11 was similarly narrow as well and this could be due to the topology chosen for design. Overall, this paper was successful in designing a LNA to operate at the center frequency of 5.5 GHz, however, was not able to meet the bandwidth requirements to operate within the 5GHz band. Future papers could address this by using a more advanced topology or also using bandwidth increasing techniques.

Keywords

LNA, Wi-Fi, IoT, 22nm, 5Ghz

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