# Answer to Question #55989 in Electric Circuits for promise

Question #55989

Which of the following is not a valid parameter value of the ideal Op Amp?

Input impedance = infinity

Gain = 200000

Output impedance = Zero

Bandwidth = infinity

Input impedance = infinity

Gain = 200000

Output impedance = Zero

Bandwidth = infinity

Expert's answer

The IC Op-amp comes so close to ideal performance that it is useful to state the characteristics of an ideal amplifier without regard to what is inside the package.

1. Infinite voltage gain

2. Infinite input impedance

3. Zero output impedance

4. Infinite bandwidth

5. Zero input offset voltage (i.e., exactly zero out if zero in).

These characteristics lead to the golden rules for op-amps.

Answer: Gain = 200000.

1. Infinite voltage gain

2. Infinite input impedance

3. Zero output impedance

4. Infinite bandwidth

5. Zero input offset voltage (i.e., exactly zero out if zero in).

These characteristics lead to the golden rules for op-amps.

Answer: Gain = 200000.

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