Non-Linearity in RF System - Part I — Lesson 2

This lesson covers the concept of linearity in RF systems, focusing on gain compression, frequency modulation, and amplitude modulation. It explains how gain compression affects RF systems and how it can be improved by enhancing circuit topology. The lesson also discusses the impact of frequency modulated signals on gain compression and the effects of amplitude modulated signals on system sensitivity. It further delves into the concept of blockers and their role in desensitizing RF systems. The lesson concludes with an explanation of intermodulation and its impact on RF systems.

Video Highlights

00:25 - Introduction and frequency modulated signal
08:13 - Concept of intermodulation in RF systems
11:43 - Analysis of intermodulation through derivation
25:00 - Explanation of the third order intercept point (IIP3) in RF systems
31:19 - Relationship between iip3 and 1 DB compression point

Key Takeaways

- Gain compression is a crucial aspect of RF systems, typically ranging between 20 to 25 DB.
- Frequency modulated signals do not significantly affect gain compression as the amplitude remains constant.
- Amplitude modulated signals can reduce system sensitivity due to high amplitude blockers.
- Blockers can desensitize RF systems, reducing signal amplitude and degrading the signal-to-noise ratio.
- Intermodulation occurs when more than one signal is applied to a nonlinear system, resulting in harmonic distortion.