- 5 If A Varactor Has A Capacitance Of 90 Pf At Zero Volts What Will Be The Capacitance At 4 Volts 6 An Oscillator Has 1 (35.84 KiB) Viewed 23 times
5. If a varactor has a capacitance of 90 pF at zero volts, what will be the capacitance at 4 volts? 6. An oscillator has a frequency of 100 MHz at 20°C, and a tempco of +10 ppm per degree Celsius. What will be the shift in frequency at 70°C? What percentage is that? 7. Two sinusoidal signals, V, and V, are fed into an ideal balanced mixer. V is a 20- MHz signal; V, is a 5-MHz signal. What frequencies would you expect at the output of the mixer? 8. Suppose the phase-locked-loop frequency synthesizer of Figure 2.39 has a reference frequency of 1 MHz and a fixed-modulus divider of 10. What should be the value of the programmable divider to get an output frequency of 120 MHz?