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Please give explanation considering opamp as ideal one as well as practical one.


I got the explanation here. Decompensated Operational Amplifiers


1 Answer 1


Ideal op amp: stable with infinite bandwidth.

Practical: look for opamps that are guaranteed "unity gain stable" (most modern op amps are unity gain stable). The bandwidth can be determined by looking at the "unity gain bandwidth" or sometimes the "gain-bandwidth product." The bandwidth can be further limited for large amplitude signals by the slew rate, usually expressed as the change in output voltage per unit time.

  • \$\begingroup\$ Why was this answer downvote. Restored! \$\endgroup\$
    – Andy aka
    Jun 27, 2017 at 18:50
  • 1
    \$\begingroup\$ Sounds good to me too, +1. \$\endgroup\$ Jun 27, 2017 at 19:22
  • \$\begingroup\$ I didn't downvote it but the sloppy capitalisation doesn't help its credibility. \$\endgroup\$
    – Transistor
    Jun 27, 2017 at 20:08
  • \$\begingroup\$ Just a small correction: Slew rate is usually expressed as the output voltage CHANGE per unit time. \$\endgroup\$
    – LvW
    Jun 27, 2017 at 20:27
  • \$\begingroup\$ Thanks for the note on rate of change. Viva capitalism! \$\endgroup\$ Jun 28, 2017 at 1:43

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