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# Le1_13lb - Physics 375 Laboratory 13 Analog Math Overview...

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Physics 375, Laboratory 13 Analog Math Overview The purpose of these experiments is to use op-amps to perform mathematical operations on input voltages. Operations include sum, difference, logarithm, differential and integral. Background An operational amplifier (op-amp) is a differential amplifier with very high gain, very high input impdance, and very low output impedance. The 741 op-amp is an integrated circuit thaat comes in an 8-pin dual in-line package (DIP). The connections for the chip looking down with the notch facing up is: For large gain, low input current amplifiers used with feedback to the negative input there are two rules to follow: 1. I + = I - = 0. The input currents are 0. 2. v + - v - = 0. The input voltage difference is 0. For feedback to the negative input, the general steps for analysis are to find the voltage at the non- inverting input and use rule two to assign that same voltage to the inverting input. The next step is to find the current flowing at the inverting input from any voltage source. Based on rule one all

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