The dc problem of the integrator circuit can be alleviated by connecting a resistor RF
across the integrator capacitor C, as shown in Fig. 2.25 and thus the gain at dc will be –RF /R
rather than infinite. Such a resistor provides a dc feedback path. Unfortunately, however, the
integration is no longer ideal, and the lower the value of RF, the less ideal the integrator circuit
becomes. This is because RF causes the frequency of the integrator pole to move from its ideal
location at ω = 0 to one determined by the corner frequency of the STC network (RF , C). Specifically,
the integrator transfer function becomes
The dc problem of the integrator circuit can be alleviated by connecting a resistor RFacross the integrator capacitor C, as shown in Fig. 2.25 and thus the gain at dc will be –RF /Rrather than infinite. Such a resistor provides a dc feedback path. Unfortunately, however, theintegration is no longer ideal, and the lower the value of RF, the less ideal the integrator circuitbecomes. This is because RF causes the frequency of the integrator pole to move from its ideallocation at ω = 0 to one determined by the corner frequency of the STC network (RF , C). Specifically,the integrator transfer function becomes
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