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
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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 )
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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
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This note was uploaded on 04/15/2008 for the course COMP CETU311 taught by Professor Butler during the Spring '08 term at Northeastern.

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

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