Question

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For the electronics experts The following VCO is used for direct FM generation. -) mt) (a) Explain its operation and list the advantages and disadvantages over the indirect method If the voltage variable capacitor is a reversed biased pn junction diode whose capacitance is related to the reverse biasing voltage v by Cy- (100/ 1+2v) p The capacitance Co- 200pF and L is adjusted for resonance at 5 MHz when a (b) fixed reverse voltage v 4 volts is applied to the capacitor Cy. The modulating voltage is m(t) 40.045sin(2T10t) If the oscillator amplitude is 1 volt, write an expression for the angle modulated output signal that appears across the tank circuit.

Answer 1

uitiem. (a) Direct FM modulafr uses areverse bias debonds on width 맛 depletion auording to he magnitude of hertrse btas Vo chanqe^ 2tL. C 知 Va s. VR.B vamtagu : >It cam e used to ununabe hegh sigmal due to harmenib prusimt in m 나)

b) I+ 2 V LE? b 5MHz 2-TT mit)-4 + 0.045るin (2n x10%) xsex5xiot).aous.