Figure 45. Typical input waveforms and differentiated
output waveforms
34.
INTEGRATOR.
a. The longtimeconstant, lowpass RL circuit shown in Figure
46A is an integrator. The gradually increasing amplitude of output
voltage ER (Figure 46C) is proportional to the length of time the
applied voltage is present. The action of the inductor in the long
timeconstant circuit opposes any change in current flow and,
therefore, opposes current flow when a voltage is applied to the
circuit. The smaller the current flow, the smaller is the voltage
drop across the resistor. ER increases as the current increases,
which is a factor of the length of time that the input voltage is
applied.
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