This should also be obvious
from the integrator circuit itself. Reference to Fig. 2.24(a) shows that the feedback element is
a capacitor, and thus at dc, where the capacitor behaves as an open circuit, there is no negative
feedback! This is a very significant observation and one that indicates a source of problems
with the integrator circuit: Any tiny dc component in the input signal will theoretically
produce an infinite output. Of course, no infinite output voltage results in practice; rather, the
output of the amplifier saturates at a voltage close to the op-amp positive or negative
power supply (L+ or L−), depending on the polarity of the input dc signal.