Low Noise Amplifier Design - Part I — Lesson 1

This lesson covers the process of designing low noise amplifiers using S parameters. It begins with a discussion on the concept of low noise amplifiers and the importance of input referred noise. The lesson then delves into the process of transforming a noisy two-port network into a noiseless one by adding voltage sources. It further explains how to derive the noise factor and the short circuit current. The lesson also discusses the correlation between noise voltage and noise current, and how to minimize the noise factor. The lesson concludes with a practical example of designing a low noise amplifier at 4 GHz using given S parameters.

Video Highlights

00:25 - Low noise amplifier design
06:12 - how to reduce the noise factor in amplifier design
08:21 - Explanation of how to reduce the noise factor in amplifier design
13:26 - Converting admittance to reflection coefficient
17:18 - Example problem
26:48 - Explanation of how to plot the noise Circle and gain Circle to find the minimum noise speaker

Key Takeaways

- Low noise amplifiers are crucial in high-frequency RF transceiver design.
- The noise factor can be minimized by choosing the right parameters.
- The correlation between noise voltage and noise current plays a significant role in amplifier design.
- The process of designing a low noise amplifier involves plotting noise figure circles and gain circles and optimizing the gain.