From the equation, it is clear that the fo is inversely proportional to CT & RT and directly proportional to Vc.Therefore, the output frequency can be changed by changing either voltage control, CT or RT. 7. Calculate the value of external timing capacitor, if no modulating input signal is applied to VCO. Consider fo=25 kHz and RT=5 kΩ.
A. 6nF
B. 100µF
C. 2nF
D. 10nF
Answer:A
From the equation, it is clear that the fo is inversely proportional to CT & RT and directly proportional to Vc.Therefore, the output frequency can be changed by changing either voltage control, CT or RT. 7. Calculate the value of external timing capacitor, if no modulating input signal is applied to VCO. Consider fo=25 kHz and RT=5 kΩ.
A. 6nF B. 100µF C. 2nF D. 10nF
Explanation: When modulating input signal is not applied to VCO, the output frequency becomes fo=1/(4×RT×CT)