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Generally, it is desirable that amplifiers neither affect the preceding circuit nor be affected by the subsequent circuit.
Therefore, amplifiers should have high input impedance and low output impedance.
Op-amps have characteristics close to these requirements. The following compares the ideal and real op-amps:
Although there is no such thing as an ideal op-amp, you can assume the ideal op-amp early in the design stage.
However, you should consider the differences between the ideal and real op-amps when you proceed to the detailed design stage.
For example, if the input impedance of an op-amp is low, its input voltage is derived from the input impedance of that op-amp and the output impedance of the preceding device. The low input impedance of an op-amp also affects its feedback loop.
If the output impedance of an op-amp is not zero, its output voltage is derived from the output impedance of that op-amp and the impedance of its load.
In typical applications, however, the input impedance of an op-amp is negligibly large compared with the input impedance of the preceding circuit, and the output impedance is negligibly small compared with the impedance of the subsequent load. Therefore, these impedances usually do not have a significant impact. The same is true of the other parameters shown above.
Take their impacts into consideration when creating a detailed design.
The following documents also contain related information:
Basics of Operational Amplifiers and Comparators
Why is feedback used in op-amps?
What are open-loop and closed-loop gains of an op-amp?
What is the purpose of using a differential amplifier? (Common-mode rejection ratio: CMRR)
What is the input offset voltage of an op-amp?
What is the maximum frequency at which an op-amp can be used?
Is there any way to amplify a signal with a voltage close to the power supply level?
What types of noise affect an op-amp?
Are there any considerations for using an op-amp at low voltage?
What is the common-mode input voltage of an op-amp?
What does rail-to-rail mean?
Product web page
Operational Amplifiers and Comparators
Operational Amplifier ICs and Comparator ICs
Input and output full range
Low input offset voltage