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NHE2484: Communication System

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Added on  2019-10-16

NHE2484: Communication System

   Added on 2019-10-16

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NHE2484: Communication SystemFM Demodulation
NHE2484: Communication System_1
NHE2484: Communication SystemAbstractThe PLL CD4046 IC is used as a demodulator circuit for frequency demodulation
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NHE2484: Communication SystemTable of ContentsIntroduction.....................................................................................................................................3Procedure........................................................................................................................................4Theory..............................................................................................................................................9Conclusion......................................................................................................................................13
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NHE2484: Communication SystemIntroductionThe Phase-Locked Loop (PLL) circuit is used in control and communication systems. A phase locked loop circuit consists of three main components; a voltage-controlled oscillator (VCO), a phase comparator, and a low-pass filter . When used as a FM demodulator, the input to the PLLcircuit is a FM signal and the output (demodulated signal) is the output from the low-pass filter.The operation of this demodulator is described as follows: The phase comparator detects the difference between the phase (or frequency) of the VCO output and that of the input signal. The function of low-pass filter is to filter phase error and then it is used to adjust the VCO . That is the phase of the VCO phase locks on the phase of the input signal.
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