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Dialogue: 0,0:00:00.08,0:00:04.62,Default,,0000,0000,0000,,>> In this video, I would like to review what a non-inverting summer does.
Dialogue: 0,0:00:04.62,0:00:08.63,Default,,0000,0000,0000,,We begin by starting with a non-inverting amplifier that you see here,
Dialogue: 0,0:00:08.63,0:00:12.34,Default,,0000,0000,0000,,where you have a single input voltage going to a single output voltage.
Dialogue: 0,0:00:12.34,0:00:15.88,Default,,0000,0000,0000,,Then, we're just going to start adding input voltages to it.
Dialogue: 0,0:00:15.88,0:00:21.86,Default,,0000,0000,0000,,So, we've got this Rs2 with a second voltage Vs2.
Dialogue: 0,0:00:21.86,0:00:28.17,Default,,0000,0000,0000,,What happens over here is that this side acts somewhat like a voltage divider,
Dialogue: 0,0:00:28.17,0:00:31.26,Default,,0000,0000,0000,,and so we're going to have an additional gain term over here which is
Dialogue: 0,0:00:31.26,0:00:36.15,Default,,0000,0000,0000,,Rs2 over Rs2 plus Rs1,
Dialogue: 0,0:00:36.15,0:00:45.21,Default,,0000,0000,0000,,and then we're going to add in our second voltage Vs2 times Rs1 over Rs1 plus Rs2.
Dialogue: 0,0:00:45.21,0:00:49.14,Default,,0000,0000,0000,,This again right here is multiplied by both of them.
Dialogue: 0,0:00:49.14,0:00:53.08,Default,,0000,0000,0000,,This gives us a circuit that has positive,
Dialogue: 0,0:00:53.08,0:00:54.65,Default,,0000,0000,0000,,both of these are positive,
Dialogue: 0,0:00:54.65,0:00:56.42,Default,,0000,0000,0000,,this value is positive,
Dialogue: 0,0:00:56.42,0:01:00.32,Default,,0000,0000,0000,,this is positive, this is the non-inverting part that we
Dialogue: 0,0:01:00.32,0:01:04.52,Default,,0000,0000,0000,,have no change in the polarity or the positive-negative of our values.
Dialogue: 0,0:01:04.52,0:01:10.58,Default,,0000,0000,0000,,So, we could bring Vs1 and Vs2 into
Dialogue: 0,0:01:10.58,0:01:16.72,Default,,0000,0000,0000,,a circuit where we're going to multiply each of them by a separate value,
Dialogue: 0,0:01:16.72,0:01:18.92,Default,,0000,0000,0000,,a gain term, and then we're going to bring them
Dialogue: 0,0:01:18.92,0:01:22.90,Default,,0000,0000,0000,,together and add them up and that gives us the V out.
Dialogue: 0,0:01:22.90,0:01:25.06,Default,,0000,0000,0000,,This is what a non-inverting summer does.
Dialogue: 0,0:01:25.06,0:01:29.00,Default,,0000,0000,0000,,Remember that as with all of our op-amp circuits,
Dialogue: 0,0:01:29.00,0:01:32.81,Default,,0000,0000,0000,,the value of V out is still limited between
Dialogue: 0,0:01:32.81,0:01:37.49,Default,,0000,0000,0000,,the two power supply voltages Vcc and minus Vcc,
Dialogue: 0,0:01:37.49,0:01:39.94,Default,,0000,0000,0000,,we can't get any bigger or smaller than the
Dialogue: 0,0:01:39.94,0:01:43.71,Default,,0000,0000,0000,,power supplies that we're using, and there's our circuit.