Physics for Electrical Engineering: Unit I: Dielectric Materials and Insulation
Crystal Filter
Diagram, Working Principle, Applications
Crystal filter allows certain frequencies to 'pass' through an electrical circuit and cut the undesired frequencies. The crystal filters are used in radio communications, telecommunications, signal generation, GPS devices and many electronic devices.
CRYSTAL
FILTER
Crystal
filter allows certain frequencies to 'pass' through an electrical circuit and
cut the undesired frequencies. The crystal filters are used in radio
communications, telecommunications, signal generation, GPS devices and many
electronic devices.
Working
Crystal
filters are electronic filters that use monolithic crystals. A monolithic
crystal filter uses one large crystal rather than an array of several discrete
crystals. (Fig. 1.31)
Crystal filters are usually usually made of
synthetically- manufactured quartz. The quartz crystal is cut into planks and
then polished to produce a smooth surface.
The
surface is chemically-etched to further refine the finish and minimize the
effects of aging.
In
a monolithic filter, the single crystal is fitted with two sets of electrodes
on either side. The electrodes made of silver, gold, or aluminium are deposited
on the top and bottom surface of the crystal. The electrodes use the resonance
qualities of the crystal to pass signals.
The
crystal filters use the piezo-electric effect to transmit filtered signals from
one set of electrodes to the other set. The signals on the originating
electrodes cause the crystal to vibrate at a certain frequency.
Only
the signals within the band-pass of the filter are allowed across the crystal.
This crystal band-pass filter operates efficiently at a frequency below 30 MHz.
Applications
1.Crystal
filters are used in the intermediate frequency (IF) stages of high-quality
radio receivers. They are very stable mechanically. Thus, only a small change
in resonant frequency with changes in operating temperature.
2.
The most common use of crystal filters are at frequencies of 9 MHz or 10.7 MHz
to provide selectivity in communications receivers.
Physics for Electrical Engineering: Unit I: Dielectric Materials and Insulation : Tag: : Diagram, Working Principle, Applications - Crystal Filter
Physics for Electrical Engineering: Unit I: Dielectric Materials and Insulation
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Physics for Electrical Engineering
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