# SPICE A Guide to Circuit Simulation and Analysis using by Paul W. Tuinenga

By Paul W. Tuinenga

A ebook on desktop circuit simulation utilizing SPICE.

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Additional resources for SPICE A Guide to Circuit Simulation and Analysis using Pspice

Example text

4 This means the feedback section has to square the output voltage, a function we just covered earlier. Now we can build a circuit that calculates, with a small degree of error, the square-root of the input voltage. DC Vin 0 L O . END Notice that resistors were placed across all of the source outputs. Without them the source outputs would be dangling, for the inputs to the controlled sources are considered by PSpice to have infinite impedance. 2 Build and run the square-root circuit. Check the output values.

Does it work for negative input voltages? Now suppose we wanted a circuit whose output would be the ratio of the two input voltages. Then the function the feedback section has to perform is gain = outputlinputl = (inputllinput2)linputl = I linput2 = 1 IK This means the feedback section has to multiply the output voltage by the denominator point. So now we can build a circuit that calculates, with a small degree of error, the ratio of two input voltages.

Try a different DC sweep, starting at +5 volts and sweep to -5 volts. Why doesn't the circuit work for negative input voltages? 3 Build and test a cube-root circuit. Does it work for negative input voltages? Now suppose we wanted a circuit whose output would be the ratio of the two input voltages. Then the function the feedback section has to perform is gain = outputlinputl = (inputllinput2)linputl = I linput2 = 1 IK This means the feedback section has to multiply the output voltage by the denominator point.