In this simulation of this lesson, we're going to do a DC sweep of a CMOS inverter. So we're going to understand what it means. So, first thing, we have here, your schematic and let's draw this circuit. Let's choose a p MOS far, which is a big channel MOSFET transistor with with explicit substrates connection. Yeah, ASCII and loss for Yeah. We have we must have jus voltages losses here and here.

We need to ground and then the connections Add some labels this is v n V out connect the book of those two resistors of CMOS reconnect VDD on the voltage SOS supply voltage source and, and laws are connects or grounds He's usually John's his way. So, let's proceed with some explanations. What happens here is that the CMOS inverter which is very basic devices or digital circuits, is consisted of two transistor drew most fat transistors A p MOS and then mas which is a B channel resistor and an H and channel transistor when they're connected this way, this is the equal to voltage inputs B and this is the outputs. And we have here the supply voltage which magically serve as a supply in order to the secrets your operates. It supplies the power to the secret This also applies the input voltage, input voltage Bible to voltage.

I mean that information if it's high, it's a bit one. If it's low, it's a bit zero. Remember, it's used for digital circuits law. So high signal, he means we're going to use a five volts for instance and the low signal, he means we're going to use zero volts. For instance, the event the operation means we're going to get the opposites logical value here. If we put zero volts here, we're going to have five volts here.

And if we put five volts here, we're going to get zero volts here. So let's set up these voltage which is supposed to be constant and then Let's set up this one. Although this is going to change in our DC sweep. We must set up channel configuration length and width. Let's have one Meeker run Meeker Okay. Here we got to use the same.

Okay. And then what are we going to do? We're going to simulate a did simulation command, and then we're going to choose the C suite. Now, in this spot, you're about to understand what the DC simulation really means. We're going to but v true because we're going to sweep feature typesafe linear starts with zero, stop value, that supply voltage five increments zero dot one. But stop, how does it worked, how it's supposed to, to be?

What all these values are supposed to represent. Now I explained this to you. This is the voltage source, it will vary and very diverse. It means that the computer program or we're on the simulation for v2 in zero volts, and we'll get the outputs and it to start these and then to run the simulation for zero dot one because the increment is zero dot one, zero dot one in the input and it will store the output and then 402 Starring valves but zero dot freeze zero dot fall until it reaches five volts. So in this sweep, what basically happens is that we've got a list of voltages, we, we want to test the secret with a range of voltages values. And we have to know separately which voltage we have in the output.

And then we can have a graph have lots relating the output voltage to the input voltage. So this is how it works. So let's click OK. We're going to put something somewhere here week last week and then Whoa, I think I, I didn't forget anything. So let's click the randomize. Now we get a blood pain. What are we supposed to do now we're going to blots.

See that the x axis is already set up with zero to five volts because this voltage is supposed to vary between zero and five volts. And then we're going to pop V out. It's like this. So what's happening? In this axis, we've got the input voltage, these days, this and that y axis. Whereas got the output voltage, it means that for zero voltage, we get five volts on the outputs.

And for high input, which means five volts, five volts on the input, we get zero volts, the outputs. It clearly needs to represent some continual, continuous transition. It couldn't be some something like five and then arbitrarily choose zero. He doesn't work this way. What happens is that when we slowly increase the voltage by increasing the voltage I mean we resetting up offer Experiments Not, not online, not changing wire measuring it in the online. No, we do experiments get these when do we do another experiment, get another balloon and over and over and over and we're storing all this to make a plot and then we got this.

So because of this, we can know that transition voltage, which means the voltage input voltage, which makes the output to be equal to the input. In this case, it means to dot five volts, we see that a two dot five volts in that on the input, we've got to that five volts on the output and this transition is john this way Now, we we see that here, we have some lines, straight lines. It's It is so likely that between these values where transition will be like a straight line. So why does it happen? It happens just because we, we haven't chosen a increments small enough we can decrease is it even further. So let's put the zero dot 01 and click OK. And they're going to simulate it again.

Run. And you see it became smoother because we're running the same experiment on a larger number, larger number of inputs voltages. So gets a wider range of input voltages and then we get to the more precise blots. So this was the lesson about this is we done this presenting a CMOS Nevada showing you how you can set up on our despise range of voltages. And we're getting to see the output voltages. great number of them in one singer.

Lots. So see you next lesson.