Digitally Controlled Oscillator

A digitally controlled oscillator or DCO is a hybrid digital/analogue electronic oscillator used in synthesizers. The name is an analogy with "voltage-controlled oscillator". DCOs were designed to overcome the tuning stability limitations of early VCO designs.

Read more about Digitally Controlled Oscillator:  Confusion Over Terminology, Relation To Earlier VCO Designs, Historical Context, Operation, Problems With The Design

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