OUTPUT VOLTAGE OF AN INVERTING AMPLIFIER
OUTPUT VOLTAGE OF AN INVERTING AMPLIFIER
Welcome back with a new Online Technologies For Beginners (NPROT) quiz.
A classic circuit based on the use of an operational amplifier is assigned.
The operational amplifier is powered with a Vin voltage equal to 2 V and the output voltage of the amplifier is marked with the Vout symbol.
The amplifier circuit is made up of two resistors, R1 and R2, with values respectively equal to 2 kΩ and 8 kΩ and it is requested in particular to calculate the value of Vout.
SOLUTION
It can be observed that the circuit in question is a classic configuration of a inverting amplifier whose voltage gain, as known, is given by the formula:
Substituting the values of the resistors in the formula, we have that the voltage gain is equal to:
To calculate the output voltage, it is sufficient to observe that:
And therefore, substituting the values of G and Vin, we have that:
And with this calculation, we therefore obtained the result required by the exercise.
In particular, we observe that the voltage measured at the output of the amplifier is equal to -8V.
The sign “-” clearly reflects the inverting function of the amplifier.
Well, exercise solved!
Good electronics everyone!
