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Figure shows the frequency-determining network of a voltage

Figure shows the frequency-determining network of a voltage

Figure shows the frequency-determining network of a voltage-controlled oscillator. Frequency modulation is provided is produced by applying the modulating signal Am sin (2pA?mt) plus a bias Vb to a pair of varactor diodes connected across the parallel combination of a 200-ÂľH inductor and 100-pF capacitor. The capacitor of each varactor diode is related to the voltage V (in volts) applies across its electrodes by C = 100V-1/2 pF. The unmodulated frequency of oscillation is 1 MHz. The VCO output is applied to a frequency multiplier to produce an Fm signal with a carrier frequency of 64 MHz and a modulation index of 5. Determine
(a) The magnitude of the bias voltage Vb and
(b) The amplitude Am of the modulating wave, given that A?m = 10 kHz.

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