Feedback in Integrator Amplifier of Op-Amp
&quot;Why in analog computers for the integrator amplifier the feedback resistor is not applied? So, how to make sure (apart from resistors configuration) that circuit operates in linear phase?&quot;
The answer is quite simple: In analog computers, the integrator is used always in a closed-loop which - for operating point stability reasons - represents a negative feedback loop for DC. Hence, the feedback resistor which realizes negative DC feedback for the &quot;naked&quot; integrator stage is not necessary. Tne integrator block works with a fixed stabilized DC operating point.