Question

In the expression $V_0=A{V}_n$, A is called ______________

• A. Closed loop gain
• B. Open loop gain
• C. Negative feedback gain
• D. Feedback gain with inverting input

Answer 1

The correct option is B Open loop gain

$\left(i\right)$ Closed loop gain $=A_{C1}=\frac{A_{01}}{1+A_{01}\beta }$

Where,

$A_{o1}=$Open loop gain

$\beta =$Feedback factor

$\left(ii\right)$ Open loop gain $A_{OL}=\frac{V_{out}}{V_{in}}$

$V_{out}=$Output Voltage

$V_{in}=$Input Volatge

so, $V_{out}=A_{OL}.V_{in}$

or, $V_o=A.V_n$

$\left(iii\right)$ Negative feedback gain$=\frac{A}{1+A\beta }$

$\left(iv\right)$ Feedback gain with inverting input$=\frac{A}{1-A\beta }$

$\therefore$ in the expression $V_o=A{V}_n,A$ is called open loop gain.