What you'll learn
Understand problems of VCO design and challenges
Oscillator design methodology and approach
Learn to build the unit cells to improve the design scope
Solving the phase generation and phase difference problem

Requirements
Understanding phasor diagram
Phase relationships of passive and active devices
Description
Every activity in the world is designed to work on a reference.

Timing is important for deteing a relationship between events and activities in the world. A method to have a reference in the electronic design is Clock. A clock is a signal used to provide the reference for all the activities, events and order in which the execution has to take place. Controlled Oscillators are an important cog-in-the-wheel of the timing circuit in the electronics world. They can be controlled either using voltage or current. The VCOs are designed using Ring Oscillators or LC Tank oscillators. The high performance oscillators are part of the LC Tank domain while the low frequency oscillators are done using Ring Oscillator.

The design of a high performance voltage controlled oscillator, VCO, is not is not a trivial task. Consideration of the circuit, components used and the layout all play a role in deteing the performance. This requires sound theoretical design, followed by careful choice of all the components and then a good custom layout. Even with circuit simulation, it may take a couple of iterations of the VCO layout.

To make a VCO, the oscillator needs to be tuned by a voltage. This can be achieved by making the variable capacitor from varactor diodes. The tune voltage for the VCO can then be applied to the varactors.

Who this course is for
Advanced designers of oscillators
People interested in learning VCO design
ADC design using VCO
Designing DLLs for high speed circuits

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