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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.
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.
The 8284 contains a clock generator capable of a third the frequency of the input clock (5 or 8MHz with the 8284A, and 10MHz with the 8284A-1), with sources selectable between an external crystal and clock input. The main clock output consists of a 4.5V (Vcc @ 5V) pulse wave at a 33.3% duty cycle, with an additional peripheral clock running at ...
The Pierce oscillator is a type of electronic oscillator particularly well-suited for use in piezoelectric crystal oscillator circuits. Named for its inventor, George W. Pierce (1872–1956), [ 1 ] [ 2 ] the Pierce oscillator is a derivative of the Colpitts oscillator .
The frequency of the oscillator can be "pulled" in wider range than with high-Q crystal. This allows wider range of adjustments, which may be critical in devices operating in extreme (especially low) temperatures where the crystal's own temperature-frequency dependence could take it outside of the pullable range for the desired frequency.
The clock rate of a CPU is normally determined by the frequency of an oscillator crystal. Typically a crystal oscillator produces a fixed sine wave—the frequency reference signal. Electronic circuitry translates that into a square wave at the same frequency for digital electronics applications (or, when using a CPU multiplier, some fixed ...
An OCXO inside an HP digital frequency counter Miniature crystal oven used to stabilize the frequency of a vacuum-tube mobile radio transmitter. A crystal oven is a temperature-controlled chamber used to maintain the quartz crystal in electronic crystal oscillators at a constant temperature, in order to prevent changes in the frequency due to variations in ambient temperature.
The Gonset's receiver was manually tuned over the unit's frequency range with an analog dial, while the transmitter frequency was controlled by a crystal oscillator. The original model had a single jack on the front panel for an FT-243 style crystal. A chain of frequency multipliers allowed crystals in the 8 MHz range to be used. Many such ...
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