Окт22012

# Op amp investing summing amplifiers

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And assign it. Choose something you claims to focus this or edit and security, you might want to. TeamViewer is a great utility to on these items. My suggestion is multiple websites with seconds only.Summing amplifier, as the name goes it sums up the multiple inputs and provides a single output. At the input side, the inputs applied consists of multiple signals that is connected parallelly. This type of amplification circuit can be designed based on inverting or an non-inverting amplifiers. The single output from a summing amplifier can be determined by using the concept of the ohms law. Multiple input signals applied consists of resistors attached before it is connected to the terminal.

The value of the input is equivalent to its connected resistor that means that applied signals proportional to the number of resistors connected to it. An amplifier that is designed such that it adds up the applied input signals to generate the single output is defined as a summing amplifier.

It is very simple to construct. Even the functionality of this amplifier is simple to analyze. The audio mixer is one of the best examples of the summing amplifiers in which the signals are mixed with the help of a mixer or adder. Changing the gain value of the summing amplifier is easier as it involves only the change of the input signal values. If the input signal value has to be constant in that case the resistor values can be altered accordingly to obtain the required gain.

In this type of operational amplifier, multiple resistors are connected to each of the applied input signals. These are summed up in such a way that an individual output signal is obtained. It is generally an inverting amplifier with the multiple input signals.

A non-inverting summing amplifier can be designed similar to that of the inverting amplifier. In this case, the input signals are applied to the non-inverting terminal whereas the feedback is provided to the inverting terminal.

This is possible by the voltage divider biasing circuit. To design these amplifier circuits firstly it is designed based on the required gain. Once it is done then the necessary resistors are arranged based on it. If the resistors considered are equal then in such case the output value of the voltage will be given as.

Let us consider the summing amplifier designed based on the inverting amplifier with the multiple input signals applied to it. Its value of the output voltage can be calculated as. The output voltage Vout value can find out for the summing amplifier with the help of the equation shown below.

Let's see if we can do that. So looking at my circuit the other thing I know about op-amps that's really important always is, that the current going into an op-amp input is zero, or practically zero. And for the purposes of what we're doing here we can treat it as zero. All right. So, we have zero volts on this node. We have zero current going this way. So let's go after let's go after this current right here. Let's figure out what that is. So we'll call that I. So we can write I equals, now what is it?

Well, we have IA here. And we have IB flowing here. So we get I equals, what is IA? IA is this voltage divided by RA. And this voltage is VA minus zero volts. So it's VA over RA. And now let's write down what's IB? IB we look at this voltage here. This voltage is VB minus zero. Or just plain VB over RB. All right, so that's one step. We've written this current in terms of what's going on on the input side over here.

Now one thing we know, because this current is zero, we know, what? We know this current is I. So now let's write an expression for I in terms of RF and this voltage here. What is this voltage here? Well, let's look at the two ends. This is zero volts on this node here.

And on this side it's V out. So, the current there, the current on that side equals it's zero minus V out. So minus V out divided by RF. That's Ohms Law for this resistor right here. Now we know that this current equals this current. So let's just set these two expressions together.

So I'll do that over here. Now we can get the final function I'm just gonna multiply through by RF on both sides. So that's our answer. And you can see that the resistor ratio, there's two resistor ratios here, that are participating in the answer. So it helps to do a little special case of this. Let's let all the resistors be the same. And just to pick a real number we'll just say they're all equal to 10 K ohms. And let's see what this becomes now. Now we have V out equals, we still have the negative sign.

So this is some sort of inversion going on here. RF over RA is one. So it's just VA. And RF over RB is one. So this says VB. So this is what gives us the nickname for this expression which is called a a summing op-amp. Okay, this is what I want.