Figure 9.2. There is a block labeled crystal oscillator. Its output goes into input 1 of the phase detector. The output of the phase detector goes through a resistor, R1, to the input of the V C O. The input of the V C O also connects through a capacitor then through R2 to ground. The output of the V C O goes to another block labeled divide by N. The output of the divide by N block goes to input 2 of the phase detector. End verbal description.
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