Magnitude of the gain in the inverting op-amp amplifier

Home » Analog Circuits » Analog circuits miscellaneous » Question

Magnitude of the gain in the inverting op-amp amplifier circuit shown in the figure be x with switch S₁ open. When switch S₁ is closed, then magnitude of gain becomes

1. x
  2
2. – x
3. 2x
4. – 2x

Correct Option: A

	V_o	= A =	-2R	= -2 = x
	V_i		R

When switch S₁ is closed,

A =	-R	= -1 =	x
	R		2