Differential operational amplifier explained.

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01:22:30

Start from the top of the workspace.
Differential and amplifier. 

Differential:
The op amp. calculates the difference between the positive and the negative inputs. 
See the top amplifier:
Difference = Input(+) - Input(-) = 1V - 1.2V = -0.2 mV 

Amplifier:  It multiplies the difference between the two inputs with its gain. The higher the difference, the higher the output. 
See the middle amplifiers:
Output = Difference * Gain = -0.2 mV * 25 V/V = -5V

The gain factor.
The larger the gain factor of the op amp, the more rapid the response of the output is. The faster we can reach the Supply voltage levels (with a sine wave)

published 9 years ago

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