Op-amp Example 1

Op-amp Example 

Find the closed loop gain of the following inverting amplifier circuit.

Solution: 

First of all here check for the circuit. ( is it inverting or non-inverting ?)

Here input is at the -ve terminal so it is inverting configuration.

Using the formula for the gain of the inverting op-amp circuit

we can now substitute the values of the resistors in the circuit as follows,

Rin = 10kΩ  and  Rƒ = 100kΩ

and the gain of the circuit is calculated as: -Rƒ/Rin = 100k/10k = -10

Therefore, the closed loop gain of the inverting amplifier circuit above is given -10 or 20dB (20log(10)).