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Crystal oscillator


A crystal oscillator is an electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a very precise frequency. This frequency is commonly 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 most common type of piezoelectric resonator used is the quartz crystal, so oscillator circuits incorporating them became known as crystal oscillators,[1] but other piezoelectric materials including polycrystalline ceramics are used in similar circuits.

Quartz crystals are manufactured for frequencies from a few tens of kilohertz to hundreds of megahertz. More than two billion crystals are manufactured annually. Most are used for consumer devices such as wristwatches, clocks, radios, computers, and cellphones. Quartz crystals are also found inside test and measurement equipment, such as counters, signal generators, and oscilloscopes.

crystal oscillator

Crystal Applications: Cell phones, communications, wireless communications, GPS, audio systems, digital devices, smart home, networking, game consoles, computers and computer peripherals, digital products, Walkman, remote control light on consumer electronics products.

Most are relying on the remote control to a specific frequency to send and receive signals. For example, there is a 72.810 crystal, so that the signal is emitted as an electromagnetic wave with a frequency of the transmitter prepared 72.810; also has a receiver with the frequency of the crystal, so that the circuit of the receiver only receives 72.810 electromagnetic waves, electromagnetic waves from other frequency interference. If there is no crystal, the receiver can not receive any signal, because the outside world does not cause waves in the receiver circuits "resonance" will be unable to control. Of course there are crystal-free receiver and transmitter, it is replaced by other circuits crystal.

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