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An ideal OP-Amp Is an ideal ______________

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An ideal OP-Amp Is an ideal ______________

(a) Current controlled current source

(b) Current controlled voltage source

(c) Voltage controlled voltage source

(d) Voltage controlled Current source

This question was posed to me in class test.

This intriguing question originated from Properties of Negative Feedback in division Differential and Multistage Amplifiers of Electronic Devices & Circuits

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Correct choice is (c) Voltage controlled voltage source

The best I can explain: The term op-amp refers to a voltage –controlled voltage source. The input impedance is very high (approximately infinity) and the output impedance is very low. An op-amp without feedback measures the input voltage and puts out an output voltage proportional to the input. The ideal operational amplifier voltage is maintained constant. It is controlled by input voltage.

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