Question

How do you calculate the output voltage of a non-inverting op-amp amplifier?

Answer 1

To calculate the output voltage of a non-inverting operational amplifier (op-amp) amplifier, you'll need to know the circuit configuration, the input voltage, and the gain of the amplifier. The non-inverting op-amp configuration is one of the most commonly used amplifier topologies.

The non-inverting op-amp amplifier circuit looks like this:

lua
Copy code
       +Vin ----- R1 -----+----------- Vout
                          |
                         R2
                          |
       GND --------------+


Here, +Vin is the input voltage, Vout is the output voltage, R1 is the feedback resistor, and R2 is the input resistor. GND represents the ground (0V reference).

The gain of the non-inverting op-amp amplifier is given by the formula:

scss
Copy code
Gain (A) = 1 + (R1 / R2)


Now, to calculate the output voltage Vout, you can use the following formula:

makefile
Copy code
Vout = Gain * Vin


Simply multiply the input voltage Vin by the gain A to get the output voltage Vout.

It's important to note that ideal op-amps have very high input impedance, which means the current flowing into the input terminal is negligible. Therefore, the current entering the input terminal of the op-amp is considered zero, and the input terminal voltage is the same as the voltage at the non-inverting terminal (V+).

As a result, the voltage at the non-inverting terminal (V+) is equal to the input voltage Vin. This makes the analysis of the non-inverting op-amp amplifier simple, and the output voltage Vout is determined solely by the input voltage and the gain, as shown in the formula above.