op amp is not a bad one, a circuit designer has to be thoroughly familiar with the characteristics
of practical op amps and the effects of such characteristics on the performance of op-amp circuits.
Only then will the designer be able to use the op amp intelligently, especially if the
application at hand is not a straightforward one. The nonideal properties of op amps will, of
course, limit the range of operation of the circuits analyzed in the previous examples.