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Step 1 of 2 11.028E The feedback factor of an ideal operational amplifier connected as a differentiator is, Substitute for Calculate the magnitude of 1/B Step 2 of 2 For stable performance of the differentiator, the frequency should be less than 1 Hz. 2πfCR=1 Rearrange the terms. ms Therefore, for stable performance, the differentiator time constant should be greater than 159 ms