FILTERS IN MOBILE CELL PHONE & THEIR FUNCTION

Types of Filters in Mobile Cell Phone and Their Function
Types of Filters in Mobile Cell Phone and Their Function – Learn about different types of filters and filters used in mobile phone and their function.

Types of Electronic Filter

In a mobile cell phone, there are generally four different types of filters used to get the desired frequency which are designed according to their properties. These 4 types of filters are as follows:
  1. Low-Pass Filter
  2. High-Pass Filter
  3. Band-Pass-Filter
  4. Band-Stop Filter
Only pass-band and one stop-band frequency is available in most general type of filters.

Low-Pass Filter

A low-pass filter allows only a specific frequency to pass and stops or rejects all frequencies above the low-tuned frequency.

High-Pass Filter

A high-pass filter stops or rejects all lower frequencies below the set frequency and passes the higher frequencies.

Band-Pass Filter

This is a type of filter that passes only a specific band of frequencies and stops higher or lower bands. This type of filters may also be tuned for one or more pass bands.

Band-Stop Filter

This type of filter stops a particular band but allows passing high or low bands. This band-stop filter is almost a low pass filter and is a combination of band-pass filter.

Crystal Filter

Mobile Phone Filter
Mobile Phone Filter
A thin section of quartz can produce RESONANCE  EFFECT like an L.C. Circuit by mechanical vibrations. This property of quartz crystal is due to PIZO-ELECTRICAL EFFECT. When this is compressed, rotated or stretched, this crystal can be stimulated by input voltage or generated output voltage. There are one or more piezoelectric crystals in a crystal filter which make resonant or anti-resonant circuit. Therefore, crystal filter is an ELECTRONIC COMPONENT that passes a selected frequency like a resonant filter.

SAW (Surface Acoustic Wave) Filter

SAW filter is used to receive desired frequencies from the range of frequencies. A SAW filter produces ultrasonic waves which are prepared by aching technique. It is made on a plate of piezoelectric material. PIEZOELECTRIC materials convert electrical signal into mechanical vibrations. Two electrodes are made at the output end of the plate like the teeth of combs combined to adjust. These tooth like electrodes perform as tuned electrical circuit. Signals of appropriate WAVELENTH and phase can be obtained from it. Similarly two electrodes are provided at the input terminal of the plate which performs as receiver.

Working System of SAW (Surface Acoustic Wave) Filter

When AC signal is given at the input terminal of a SAW filter, mechanical vibration is produced because when the signal passes between the two electrodes at the input terminal and reaches piezoelectrical plate, this vibration is converted into mechanical waves and the electrodes at the output terminal receive these waves and send out the desired controlled frequency of the phase after converting them to electrical signals. High input impedance of SAW filter is the prime drawback of this filter. As a reason, the input signal has to be amplified before directly sending to the SAW filter.

Comments

Post a Comment

Popular posts from this blog

Image
Five Simple Tips to Increase the Life of Your Phone's Battery    Properly charging your smartphone is essential for maintaining the health of your battery, and ensuring better battery life and increased safety in the long run. Simply plugging your phone in as soon as you get home and leaving the charger on until you leave in the morning is not the right solution. Since there is a lot of different advice floating around on how to charge your phone, we decided to get you tips to get the most out of your smartphone's battery from the guys who built. Here's what they told us: 1. Don't let your phone overheat Heat is perhaps the worst enemy of lithium-ion batteries, the kind most smartphones use. "You should take basic precautions like not keeping your phone on the dash board of the car where it will get a lot of direct sunlight," You should also avoid charging your phone while playing graphically intensive games, because that will also raise the temperatur...
Read more

SCIENCE.

Image
BLACK HOLE MYSTERY DATING BACK 40 YEARS SOLVED BY "BEST EVER" SIMULATION  A team of astrophysicists from Northwestern University, Oxford University, and the University of Amsterdam, used graphical processing units to crunch large sets of data and simulate how black holes interact with their accretion disks. The first photo of a black hole was captured in APRIL this YEAR PARIS: Scientists on Thursday unveiled the most detailed simulation of a black hole yet, solving a mystery dating back more than four decades over how the star-devouring monsters consume matter Coming fresh on the heels of the first ever photo of one of the giant objects, which are scattered across the Universe, astrophysicists are now several steps closer to understanding how they form and develop. A black hole is born when a large star collapses in on itself. Far from being a "hole", they are instead incredibly dense objects with a gravitational pull so strong that nothing, not even lig...
Read more

MOBILE PHONE AND THEIR ELECTRONIC COMPONENTS FUNCTIONS

Image
Small Parts / Electronic Components of Mobile Phone and Their  Function                               The PCB of a mobile cell phone has several small parts or electronic components. When LEARNING MOBILE REPAIRING , it is important to learn and understand how to identity these small parts or electronic components and understand their function. Identification of these small parts on the PCB OF MOBILE PHONE is easy if you know and understand some of the basic rules. It is also important to understand what to do if any of these small components is faulty. Most of these electronic components are SMD  ( SURFACE MOUNT DEVICES) They don’t have any leads like thru-hole ELECTRONIC COMPONENTS .                                                            ...
Read more