Question:
The characteristic of an ideal operational amplifier is
The characteristic of an ideal operational amplifier is
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Ideal Op-Amp Memory Rule:
- Input Impedance = \(\infty\) (Draws zero current, preventing loading effects).
- Output Impedance = \(0\) (Can supply unlimited current to drive any load).
Updated On: Jun 25, 2026
- Infinite input impedance and zero output impedance
- Zero input impedance and infinite output impedance
- Infinite input impedance and infinite output impedance
- Zero input impedance and zero output impedance
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The Correct Option is A
Solution and Explanation
Concept:
An operational amplifier (op-amp) is a high-gain, direct-coupled differential voltage amplifier used to build a wide variety of analog signal processing circuits. To simplify circuit analysis, engineers use an ideal model with idealized performance parameters.
Let's review the core properties that define an ideal operational amplifier:
• Infinite Input Impedance (\(Z_{\text{in}} = \infty\)): The input terminals behave like a perfect open circuit. This means the op-amp draws absolutely zero signal current from the input source (\(I_+ = I_- = 0\)). As a result, it can sense input voltages without loading down or distorting the preceding signal stage.
• Zero Output Impedance (\(Z_{\text{out}} = 0\)): The output stage acts like a perfect independent voltage source. This allows the op-amp to deliver its output voltage consistently to any connected load impedance without any internal voltage drop, regardless of how much current the load draws.
• Infinite Open-Loop Voltage Gain (\(A_{OL} = \infty\)): An infinitely small differential voltage between the two input terminals is sufficient to drive the output to its maximum value. This high gain enables accurate feedback control loop systems.
• Infinite Bandwidth (\(BW = \infty\)): The amplifier maintains its ideal gain and performance characteristics uniformly across all signal frequencies, from DC ($0\text{ Hz}$) to infinitely high frequencies.
• Infinite Input Impedance (\(Z_{\text{in}} = \infty\)): The input terminals behave like a perfect open circuit. This means the op-amp draws absolutely zero signal current from the input source (\(I_+ = I_- = 0\)). As a result, it can sense input voltages without loading down or distorting the preceding signal stage.
• Zero Output Impedance (\(Z_{\text{out}} = 0\)): The output stage acts like a perfect independent voltage source. This allows the op-amp to deliver its output voltage consistently to any connected load impedance without any internal voltage drop, regardless of how much current the load draws.
• Infinite Open-Loop Voltage Gain (\(A_{OL} = \infty\)): An infinitely small differential voltage between the two input terminals is sufficient to drive the output to its maximum value. This high gain enables accurate feedback control loop systems.
• Infinite Bandwidth (\(BW = \infty\)): The amplifier maintains its ideal gain and performance characteristics uniformly across all signal frequencies, from DC ($0\text{ Hz}$) to infinitely high frequencies.
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