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What is the purpose of an crystal oscillator?


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Answered 2009-12-08 09:08:28

Crystal Oscillators are more stable oscillator. and used as Local Oscillator in Radio Receivers

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A local oscillator can be a crystal oscillator.


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"A circuit within a computer that creates a series of pulses that pace the computer's electronic system. The oscillator clock synchronizes, paces and coordinates the operations of the computer's circuit." -- webopedia


depends on the oscillator and its purpose


SOME kind of oscillator is required, to create the AC signal that will be modulated, amplified, and eventually sent up to the antenna to be transmitted. It doesn't have to be a crystal oscillator, though.



we can use rc or lc oscillators also but crystal oscillator makes it to have longer life time


IF = Intermediate Frequency A crystal oscillator is an oscillator circuit whose frequency of operation is primarily decided by the frequency for which the crystal was cut. An intermediate frequency oscillator is the oscillator which operates at a specific frequency depending on it's purpose. For an FM receiver, the IF is 10.7MHz. For an AM receiver, the IF is 455kHz. For TVs, it's different for the luminance/chrominance/audio information. When two frequencies are sent to a nonlinear mixer circuit, the frequencies output include both the original inputs, F2-F1, and F2+F1 where F2 is the higher frequency. So, if Fs (signal from antenna) and Fi (intermediate frequency, say 10.7MHz) are both sent to a nonlinear mixer, then Fi+Fs (along with others) will be output, which means that your desired signal (music from the radio, etc.) is NOW on a 10.7MHz carrier, where it can be singled out (via filter) and the signal is worked with at 10.7MHz instead of potentially 107+MHz. It's a lot easier to design a circuit at 10.7MHz then it is at 107+MHz. If the crystal is cut to resonate at the IF, a crystal oscillator can be used for the IF oscillator. So, the IF oscillator COULD be a crystal oscillator. Hope that helps :-)


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A: When exited a crystal will oscillate at precise frequency due to its mechanical make up. An electronic oscillator external influences can make it to shift frequency very easily


Oscillators are connected externally with the microcontroller to provide high frequency signal to the oscillator circuit in the microcontroller. The oscillator circuit provides the clock signal to the micro controller. Usually "PIEZO CRYSTAL OSCILLATORS" are used in micro controllers.


There are two kinds of crystal oscillators. One operates at what is called the "series resonance" of the crystal. This resonance is the frequency at which the (AC) impedance between the pins of the crystal is almost zero. The frequency is independent of how much capacitance happens to be in parallel with the crystal - its inside the oscillator and part of the circuit board, etc. But, even frequency that the oscillator runs at.The other kind of oscillator oscillates at "parallel resonance"of the crystal. At this frequency, the impedance from pin to pin of the crystal is almost infinite. This frequency depends on how much capacitance is connected in parallel with the crystal. This parallel capacitance is called "load capacitance". Generic signal-inverter oscillator is this kind of oscillator.The common oscillator connection is for the crystal to be connected from the inverter output to the input. And, there is a capacitor at each end of the crystal to ground. The NET load capacitance is SERIES equivalent value of those two capacitors.PLUS stray capacitance from the circuit board and the guts of the oscillator. Suppose that the crystal is rated for 22pF load capacitance. The stray capacitance is about 7pF. So, that leave 15pF to be made up from discrete external capacitors. If the external capacitors are equal, then their equivalent is half of their individual value. Thus, in this case, we would want a pair of 30pF capacitors.



Usually the crystal in the oscillators are composed out of Quartz.


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c1 and c2 capacitors with crystal eliminates the Harmonics(Unwanted frequencies) .



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