Noise Figure Circles - Part II — Lesson 8

This lesson covers the concept of noise figure circles. It delves into how to design a amplifier circuit to achieve a specific noise figure. The lesson explains the process of arranging stages in cascade to get the lowest noise figure. It also introduces the concept of noise figure and noise measure. The lesson further discusses how to obtain noise figure circles and the two aspects of quantity that need to be extracted: the input referred noise voltage and the input referred current. The lesson concludes with a discussion on how to draw noise figure circles and how to obtain optimum values of Y to satisfy both the available power gain requirement and the noise figure requirement.

Video Highlights

00:15 - Introduction
01:32 - How to obtain noise figure circles
03:00 - Noise source, its characteristics and noise figure for a particular value of y
05:55 - Normalization of function
12:24 - Concept of noise measure circles
13:30 - Summary of the module

Key Takeaways

- The DC bias plays a crucial role in amplifier design, ensuring the proper functioning of the transistor.
- Various bias topologies can be used to provide the required bias.
- Frequency compensation is essential to maintain a constant gain despite frequency changes.
- Active bias circuits can produce a specific bias voltage, unaffected by circuit or temperature changes.