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Modulasi Sudut (2). Levy Olivia MT. 3.3.3 Implementation of Angle Modulators and Demodulators. Design an oscillator whose frequency changes with the input voltage. Voltage-controlled oscillator Varactor diode - capacitance changed with the applied voltage.

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Modulasi sudut 2

Modulasi Sudut (2)

Levy Olivia MT


3.3.3 Implementation of Angle Modulators and Demodulators

  • Design an oscillator whose frequency changes with the input voltage.

  • Voltage-controlled oscillator

    • Varactor diode - capacitance changed with the applied voltage.

    • A inductor with the varactor diode is used in the oscillator circuit.





  • A nonlinear device angle-modulated signalsfollowed by a bandpass filter tuned to the desired center frequency can be used as frequency multiplier.

  • For example, assume a nonlinear device has the function

  • The output signal will be

  • The frequency is multiplied by a factor of 2.


  • FM demodulation angle-modulated signals

    • generate an AM signal

    • use AM demodulator to recover the message signal

  • Pass the FM signal through a filter with response

  • If the input to the system is

  • the output

  • The above signal is an AM signal.


FM to AM converter: Tuned circuit implementation angle-modulated signals

But, usually the linear region of the frequency characteristic may not be wide enough.


  • Balanced discriminator angle-modulated signals

    • use two tuned circuits

    • connect in series to form a linear frequency response region.





v(t) is the demodulated signal


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