NHE2484: Communication System

Added on - 16 Oct 2019

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NHE2484: Communication SystemFM Demodulation
NHE2484: Communication SystemAbstractThe PLL CD4046 IC is used as a demodulator circuit for frequency demodulation
NHE2484: Communication SystemTable of ContentsIntroduction.....................................................................................................................................3Procedure........................................................................................................................................4Theory..............................................................................................................................................9Conclusion......................................................................................................................................13
NHE2484: Communication SystemIntroductionThe Phase-Locked Loop (PLL) circuit is used in control and communication systems. A phaselocked loop circuit consists of three main components; a voltage-controlled oscillator (VCO), aphase 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 thedifference 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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