Figure 4.19 shows the block diagram of a closed-loop feedback system for the carrier-frequency stabilization of...
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Figure 4.19 shows the block diagram of a closed-loop feedback system for the carrier-frequency stabilization of a wide-band frequency modulator. The voltage-controlled oscillator shown in the figure constitutes the frequency modulator. Using the ideas of mixing (i.e., frequency trans- lation) (described in Chapter 3) and frequency discrimination (described in this chapter), dis- cuss how the feedback system of Fig. 4.19 is capable of exploiting the frequency accuracy of the crystal oscillator to stabilize the voltage-controlled oscillator. Message signal m(t) FIGURE 4.19 Voltage- controlled oscillator Low-pass filter Problem 4.15 Frequency discriminator Mixer Frequency-stabilized FM wave Crystal oscillator Figure 4.19 shows the block diagram of a closed-loop feedback system for the carrier-frequency stabilization of a wide-band frequency modulator. The voltage-controlled oscillator shown in the figure constitutes the frequency modulator. Using the ideas of mixing (i.e., frequency trans- lation) (described in Chapter 3) and frequency discrimination (described in this chapter), dis- cuss how the feedback system of Fig. 4.19 is capable of exploiting the frequency accuracy of the crystal oscillator to stabilize the voltage-controlled oscillator. Message signal m(t) FIGURE 4.19 Voltage- controlled oscillator Low-pass filter Problem 4.15 Frequency discriminator Mixer Frequency-stabilized FM wave Crystal oscillator
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