An amplifier’ input impedance can be an important piece of information, as many amplifiers are often cascaded and one amplifier’s input impedance becomes another amplifier’s load impedance. Unintended audio band low-pass filters can be created if one amplifier’s coupling capacitor sees too little a load impedance.
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| This material was aimed at around a sophomore/junior EE. I read the title thinking it was going to go into those same measurements on real live product schematics, trying to solve some of the real limitations real circuits have. In real equipment, you are faced with getting the actual dynamic input Z, output Z, loop gain (in the face of potential instability), and usable max output. Spice is a great tool because you can take the actual dynamic I and V and, with gain elements, come up with accurate dynamic Zin, Zout, etc.
On many analog and digital circuits, actual Zin dives and dips from the dynamic impedances and energies moving from the driven circuitry to the loading circuitry. As we work more and more with digital-implemented analog, using Spice to accurately view the I, V, Z, and energies will become even more important.
Perhaps later articles will reflect more reality.
--Steve Grout
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