inverting amplifier

This is a super short video on the functional use of an op amp inverting amplifier circuit. More detailed info is available at www.ece.utah.edu/~ece1250

>> In this video, I would like to summarize

the function of the inverting op-amp amplifier.

We start with our basic amplifier with the output coming out as shown.

Then, we're going to run our feedback between the negative terminal and

the output as shown here.

This is going to be Rf for the feedback resistor,

and then, we're going to connect our voltage source onto this feedback loop right here,

the Vs and the Rs terms.

This is going down to ground.

Then on the positive side,

we're going to ground that positive terminal right there.

Often, V out might be over some load resistance like this.

So in this case, V out is going to be equal to Vs,

times minus Rf divided by Rs.

Again, we have Vcc and minus Vcc powering this op-amp.

So, V0 is limited between the range of minus Vcc and plus Vcc.

Let's write this as gain.

V0 is equal to the gain times Vs,

and for this amplifier,

the gain is minus Rf divided by Rs.

The negative term right here,

tells us that this is an inverting op-amp amplifier.

We can see, that Rf and Rs could be greater than one,

equal to one, or less than one.

So, the gain can be either positive or negative.

Sorry, the gain is going to be negative because it's going to be inverting.

That the gain can either increase or decrease our amplification.

We can draw our amplifier the same way.

We can say Vs and put it into a multiplier,

multiply it by the gain.

That gives us our V out value.