Consider an op amp whose open-loop gain is identical to that of Fig. 10.43. Assume that the op
amp is ideal otherwise. Let the op amp be connected as a differentiator. Use the rule of thumb
above to show that for stable performance the differentiator time constant should be greater than
159 ms. [Hint: Recall that for a differentiator, the Bode plot for has a slope of +20
dB/decade and intersects the 0-dB line at 1/τ, where τ is the differentiator time constant.]