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6 THE OPERATIONAL AMPLIFIER AS A CIRCUIT ELEMENT
short-circuit across them. The input terminals of a practical
Opamp with a large gain behave as if there is a short-circuit
across them, provided the Opamp is in a negative feedback
circuit and it is operating in its linear range.
• The principle of zero input current – The input terminals of
an ideal Opamp do not draw any current from the circuit in
which the Opamp is embedded. The input terminals of a
practical Opamp with a large input resistance draw
negligible current from the circuit in which the Opamp is
embedded. The currents drawn by the input terminals are
usually negligible in both linear ...