[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.08,0:00:02.88,Default,,0000,0000,0000,,>> In this video, I would like to summarize
Dialogue: 0,0:00:02.88,0:00:05.78,Default,,0000,0000,0000,,the function of the inverting op-amp amplifier.
Dialogue: 0,0:00:05.78,0:00:10.05,Default,,0000,0000,0000,,We start with our basic amplifier with the output coming out as shown.
Dialogue: 0,0:00:10.05,0:00:13.53,Default,,0000,0000,0000,,Then, we're going to run our feedback between the negative terminal and
Dialogue: 0,0:00:13.53,0:00:17.34,Default,,0000,0000,0000,,the output as shown here.
Dialogue: 0,0:00:17.34,0:00:20.28,Default,,0000,0000,0000,,This is going to be Rf for the feedback resistor,
Dialogue: 0,0:00:20.28,0:00:25.77,Default,,0000,0000,0000,,and then, we're going to connect our voltage source onto this feedback loop right here,
Dialogue: 0,0:00:25.77,0:00:29.64,Default,,0000,0000,0000,,the Vs and the Rs terms.
Dialogue: 0,0:00:29.64,0:00:31.16,Default,,0000,0000,0000,,This is going down to ground.
Dialogue: 0,0:00:31.16,0:00:32.82,Default,,0000,0000,0000,,Then on the positive side,
Dialogue: 0,0:00:32.82,0:00:35.34,Default,,0000,0000,0000,,we're going to ground that positive terminal right there.
Dialogue: 0,0:00:35.34,0:00:40.50,Default,,0000,0000,0000,,Often, V out might be over some load resistance like this.
Dialogue: 0,0:00:40.50,0:00:44.16,Default,,0000,0000,0000,,So in this case, V out is going to be equal to Vs,
Dialogue: 0,0:00:44.16,0:00:48.10,Default,,0000,0000,0000,,times minus Rf divided by Rs.
Dialogue: 0,0:00:48.10,0:00:54.80,Default,,0000,0000,0000,,Again, we have Vcc and minus Vcc powering this op-amp.
Dialogue: 0,0:00:54.80,0:01:00.64,Default,,0000,0000,0000,,So, V0 is limited between the range of minus Vcc and plus Vcc.
Dialogue: 0,0:01:00.64,0:01:02.18,Default,,0000,0000,0000,,Let's write this as gain.
Dialogue: 0,0:01:02.18,0:01:05.15,Default,,0000,0000,0000,,V0 is equal to the gain times Vs,
Dialogue: 0,0:01:05.15,0:01:06.60,Default,,0000,0000,0000,,and for this amplifier,
Dialogue: 0,0:01:06.60,0:01:10.16,Default,,0000,0000,0000,,the gain is minus Rf divided by Rs.
Dialogue: 0,0:01:10.16,0:01:12.29,Default,,0000,0000,0000,,The negative term right here,
Dialogue: 0,0:01:12.29,0:01:15.66,Default,,0000,0000,0000,,tells us that this is an inverting op-amp amplifier.
Dialogue: 0,0:01:15.66,0:01:20.54,Default,,0000,0000,0000,,We can see, that Rf and Rs could be greater than one,
Dialogue: 0,0:01:20.54,0:01:23.03,Default,,0000,0000,0000,,equal to one, or less than one.
Dialogue: 0,0:01:23.03,0:01:26.12,Default,,0000,0000,0000,,So, the gain can be either positive or negative.
Dialogue: 0,0:01:26.12,0:01:30.01,Default,,0000,0000,0000,,Sorry, the gain is going to be negative because it's going to be inverting.
Dialogue: 0,0:01:30.01,0:01:34.18,Default,,0000,0000,0000,,That the gain can either increase or decrease our amplification.
Dialogue: 0,0:01:34.18,0:01:36.92,Default,,0000,0000,0000,,We can draw our amplifier the same way.
Dialogue: 0,0:01:36.92,0:01:40.22,Default,,0000,0000,0000,,We can say Vs and put it into a multiplier,
Dialogue: 0,0:01:40.22,0:01:42.78,Default,,0000,0000,0000,,multiply it by the gain.
Dialogue: 0,0:01:42.78,0:01:46.18,Default,,0000,0000,0000,,That gives us our V out value.