A Tank Based Oscillators — Lesson 1

This lesson covers the tank based oscillator. It explains the basic structure of an oscillator, including the role of inductors, capacitors, and resistors. The lesson also discusses the concept of negative resistance and how it can be achieved using a latch circuit. It further explores the challenges in achieving specific conditions for oscillation and how these can be overcome. The lesson concludes with a discussion on different oscillator topologies, including pit oscillators.

Video Highlights

00:24 - Introduction
05:41 - latch circuit and the cross-coupled pair
22:45 - Biasing and use of the latch circuit in the oscillator
33:53 - Problems with the oscillator and the solutions
47:04 - Explanation of the benefits of using a square wave in the oscillator

Key Takeaways

- Oscillators are fundamental components of CMOS RF integrated circuits.
- The basic structure of an oscillator includes an inductor, a capacitor, and a resistor.
- Negative resistance can be achieved using a latch circuit, which is crucial for the functioning of an oscillator.
- Achieving specific conditions for oscillation can be challenging due to factors such as the unknown values of resistance and the need for large gm values.
- Different oscillator topologies, such as tank-based and pit oscillators, offer various advantages and can be used depending on the specific requirements.