Block
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Purpose in Example
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Pulse Generator
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Generates the reference signal, which is a periodic pulse train.
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Logical Operator (XOR)
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XOR's the frequency-divided reference signal with the frequency-divided synthesized signal.
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Analog Filter Design
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Uses a lowpass Butterworth filter to generate the control signal (along with the Gain block) and filter out high frequencies.
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Gain
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Multiplies the signal by a constant.
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Voltage-Controlled Oscillator
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Controls the frequency of the synthesized signal, by means of the input control signal.
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