Topic: Analog Circuits
A Colpitts Oscillator is having tank capacitances of 1 nF and 10 nF, and inductance of 0.1 $\mu$H. The gain required by the circuit to start oscillating is
- A. 10
- B. 100
- C. 1
- D. 1000
Answer: A. 10
Explanation: For a Colpitts oscillator, the minimum gain required to sustain oscillations is $A \ge \frac{C_2}{C_1}$.
Given $C_1 = 1\text{ nF}$ and $C_2 = 10\text{ nF}$.
$A \ge \frac{10}{1} = 10$.