Motivation First Cut Design - Part II — Lesson 2

This lesson covers the low noise amplifier design. It explains the role of the MOSFET and the concept of degenerating the source of the MOSFET. The lesson also discusses the computation of input impedance and the current going in. It further simplifies the concept by explaining the process of replacing the MOSFET. The lesson also delves into the importance of choosing the right inductor and the impact of resistors and capacitors on the design. It concludes with a discussion on noise generation and the importance of input and output matching for maximum gain.

Video Highlights

03:17 - Simplification of the circuit and the computation of z in prime
14:14 - Strategy of having a mosfet degenerated by an inductor and the need for a matching network
23:15 - Load, output matching and gain
45:04 - Tuned LNA design and the importance of choosing the values of the inductors
47:42 - Explanation of the noise generating sources in the circuit and the strategies to handle them

Key Takeaways

- The MOSFET plays a crucial role in the design of CMOS RF integrated circuits.
- Degenerating the source of the MOSFET can help in achieving a non-capacitive input impedance.
- The computation of input impedance and the current going in is essential in the design process.
- The choice of inductor can significantly impact the performance of the design.
- Resistors generate noise and should be avoided in a low noise amplifier design.
- Capacitors can lead to unstable behavior if they dominate the design.
- Input and output matching is crucial for achieving maximum gain.