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OP_Amp_Basics

OP_Amp_Basics - 741 Op Amp Offset null Inverting input...

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741 Op Amp + - 1 2 3 4 5 6 7 8 V + (typically + 15V) Output Offset null N/C Offset null Inverting input Non-inverting input V - (typically - 15V)

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741 Op Amp – Circuit Diagram
Let’s consider the input voltage required to produce an output of 1.0 volt for a range of values of the open-loop voltage gain. Gain Input 10 0.1V 100 10mV 1,000 1mV 10,000 100 μ V 100,000 10 μ V It should be evident from this table that at typical gain values of 10 5 the input voltage will be vanishingly small.

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Ideal Op Amp Very high input resistance (R in ) – Input current tends to zero (I in 0) Very low output resistance (R out 0) Output voltage independent of current Infinite bandwidth – A V constant for 0 f Infinite gain (A V )
Ideal Op Amp + - + - + - V + V - v O = A V ( v 2 - v 1 ) v 1 v 2 i 1 = 0 i 2 = 0

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Negative Feedback A fraction of the amplifier output is returned to the input and subtracted from the original input signal. Closing the feedback loop has the effect of reducing the overall gain of the system.
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OP_Amp_Basics - 741 Op Amp Offset null Inverting input...

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