Zin = (Z1*Z2)/(Z1 + Z2)
Is it possibly in the context of virtual potential, as in the case at the inverting input to an op amp, i.e. virtual earth? Must agree I've not come across the term "virtual short" before.BTW what is a virtual short circuit? A circuit is either a short or it isn't, there is no "virtual" about it.
Greeting haditya,yup..algebra is fine..
Actually, there is no true "short" -- even a piece of wire has some resistance. A "short" is relative only to other circuit resistance or impedances.BTW what is a virtual short circuit? A circuit is either a short or it isn't, there is no "virtual" about it.
But is that really a "virtual" short? Virtual meaning that something exists or results in essence or effect, though not in actual fact, reference the decription at the op amp inputs given by haditya before. Surely by bypassing the circuit in the way you describe there is nothing "virtual" about that?If you wanted to bypass a circuit, you may add a wire jumper, or a resistor of some relatively low value (1, 10, 100 ohms) across the circuit that would then act as a "virtual" short because its impedance is much lower than the circuit impedance being bypassed.
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by Jake Hertz