GATE ECE 2023 | Question: 12

Question

 A cascade of common-source amplifiers in a unity gain feedback configuration oscillates when

• A. the closed loop gain is less than $1$ and the phase shift is less than $180^{\circ}$.
• B. the closed loop gain is greater than $1$ and the phase shift is less than $180^{\circ}$
• C. the closed loop gain is less than $1$ and the phase shift is greater than $180^{\circ}$.
• D. the closed loop gain is greater than $1$ and the phase shift is greater than $180^{\circ}$.