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Do multi GHz ultra low jitter oscillators work the same way as low frequency ones

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matrixofdynamism

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Modern systems need very high speed oscillator sources with very narry tolerance for jitter. A simple oscillator used to supply clock to a microcontroller can be built by connecting a quartyz crystal with some external components to the microcontroller clock input.

Are multi GHz ultra low jitter oscillators built the same way? How are they different?
 

biff44

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they are either VCO's with PLL's locked to a low frequency crystal to control the jitter, SAW resonator based oscillators free running, or high Q microwave resonators (like sapphire, etc) and possibly phase locked to a crystal
 

jiripolivka

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In principle yes but the real technology differs. Up to ~500 MHz quartz crystals are used as resonators, other resonator types are used at microwaves. To stabilize the frequency, low-frequency crystal oscillators are used as reference, their frequency multiplied to control the high frequency VCO by phase-lock or other techniques.
 

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