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VCO (Voltage Controlled Oscillator) is important for controlling frequency signal by another control signal. Thanks to VCO, you can maintain a stable frequency. Quality of VCO consist to avoid frequency shift when a constant input signal is applied.
A staticly stable high freuqency OSC is simpliy not possible.
Have to make it OSC tunable so that it can keep track of a stable reference low frequency osc source againest factors like enviroment and process error
One application of a VCO is the Phase-Locked Loop. By using PLL, Multiple Systems can be synchronized. And, PLL can be also used in one system, where the input clock frequency can be multiplied. Since the values of the parasitic components including the connecting wires on the PCB are much much higher than those on a chip, fast chips usually adopt PLLs for reliable manufacturing.
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Why do we need VCO? Is it because we have many stages in our circuit and we need VCO to control the fluctuating feedback voltages?? :?: