Q. The necessary condition for oscillation in a Colpitts oscillator is:
✅ Correct Answer: (A)
c2/c1=gm/gi
Explanation: the condition for sustained oscillation in a colpitts oscillator is c2/c1 = gm/gi. here c1 and c2 are the capacitance in the feedback network, gm is the transconductance of the transistor and gi is the input admittance.