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 constant frequency. This 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 most common type of piezoelectric resonator used is a quartz crystal, so oscillator circuits incorporating them became known as crystal oscillators. However, other piezoelectric materials including polycrystalline ceramics are used in similar circuits.
invented by Frits Zernike
Phase-contrast microscopy (PCM) is an optical microscopy technique that…
invented by Xerox PARC
Produced at Xerox PARC by Butler Lampson, Charles Simonyi and colleagues.
invented by Fujio Masuoka
Flash memory (both NOR and NAND types) is invented in Japan by Fujio Masuoka…
invented by Herbert A. Gilbert
An electronic cigarette is an electronic device that simulates tobacco smoking.…
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