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A voltage-controlled crystal oscillator (VCXO) is used for fine adjustment of the operating frequency. The frequency of a voltage-controlled crystal oscillator can be varied a few tens of parts per million (ppm) over a control voltage range of typically 0 to 3 volts, because the high Q factor of the crystals allows frequency control over only a ...
Crystal oscillators can be manufactured for oscillation over a wide range of frequencies, from a few kilohertz up to several hundred megahertz.Many applications call for a crystal oscillator frequency conveniently related to some other desired frequency, so hundreds of standard crystal frequencies are made in large quantities and stocked by electronics distributors.
The whole Types of VCO section needs a bunch of work (see tags inline and otherwise) and these points are the least of the issues there. ~Kvng 14:48, 2 August 2015 (UTC) Kvng, thanks for the feedback. I add a few other questions. 1c. Is the image an example of grounded-capacitor VCO, an emitter-coupled VCO or a delay-based ring VCO? 1d.
Using a varactor-controlled or voltage-controlled oscillator (VCO) (described above in varactor under analog VFO techniques) and a phase detector, a control-loop can be set up so that the VCO's output is frequency-locked to a crystal-controlled reference oscillator.
A crystal oscillator is an electronic oscillator circuit that uses a piezoelectric crystal as a frequency-selective element. [1] [2] [3] The oscillator frequency is often used to keep track of time, as in quartz wristwatches, to provide a stable clock signal for digital integrated circuits, and to stabilize frequencies for radio transmitters and receivers.
Assume that the loop power supply is initially switched off and then at = the power is switched on, and assume that the initial frequency difference is sufficiently large. The loop may not lock within one beat note, but the VCO frequency will be slowly tuned toward the reference frequency (acquisition process).
Oscillator sync is a feature in some synthesizers with two or more VCOs, DCOs, or "virtual" oscillators.As one oscillator finishes a cycle, it resets the period of another oscillator, forcing the latter to have the same base frequency.
Rakon Limited is a technology company founded in 1967 that designs and manufactures frequency control products, primarily quartz crystals and temperature-compensated crystal oscillators (), [1] oven controlled crystal oscillators and voltage controlled crystal oscillators (). [2]