The inductance L_F and resistance R_F in the above circuit is used for

Concept:

Frequency compensation is used to

i) Avoids the unintentional creation of positive feedback because positive feedback reduces the stability of the system.

ii) To improve the bandwidth of the system.

Capacitance reactance \({X_C} = \frac{1}{{j\omega C}}\) 

Inductive reactance \({X_L} = j\omega L\)

Solution:

Since, when ω = ∞ (i.e., high frequency)

Capacitive reactance is given as:

\({X_C} = {\left. {\frac{1}{{j\omega C}}} \right|_{\omega = \infty }} = 0\)

i.e. short circuit and due to short-circuit a huge current will flow and may damage the circuit.

So To compensate the capacitive reactance and inductive reactance (X_L = jωL_f) with inductance L_f and resistance R_f is used. So the circuit can be protected.

Hence L_f and R_f are used for high-frequency compensation only.