Oscillator Design - Part II — Lesson 2

This lesson covers the principles of oscillator design, focusing on the cross-coupled oscillator and voltage-controlled oscillator. It explains the conditions for designing these oscillators, including the importance of the GM RP being greater than or equal to 1. The lesson also discusses the use of three-point oscillators and the role of inductance and capacitance in oscillator design. It further explores the concept of tuning oscillator frequency and the use of voltage control oscillators in transceiver design. The lesson concludes with a discussion on the use of negative resistance models in oscillator design.

Video Highlights

00:43 - Three-point and voltage-controlled oscillators
04:28 - How to change the oscillation frequency using a MOS variable capacitor
09:54 - Concept of discrete tuning in oscillators and its issues
19:14 - Oscillators using a common emitter BJT
21:07 - Explanation of different types of oscillator
25:16 - Oscillator models
29:30 - Condition of oscillation

Key Takeaways

- Cross-coupled oscillators require GM RP to be greater than or equal to 1 for effective design.
- Three-point oscillators are used by tapping out the inductance at one point.
- The use of voltage control oscillators is crucial in transceiver design for tuning oscillator frequency.
- Negative resistance models are used in oscillator design to sustain oscillation.
- Discrete tuning can be used to improve the tuning range of an oscillator.