D 13.30 Consider the folded-cascode op amp of Fig. 13.9 when loaded with a 10-pF capacitance. What should the bias current IB be to obtain a slew rate of at least 10 V/µs? If the input-stage transistors are biased at a current three times that at which each of Q3 and Q4 is biased, find the value of I. If the input-stage transistors are operated at overdrive voltages of 0.15 V, what is the unity-gain bandwidth realized? If the two nondominant poles have the same frequency of 50 MHz, what is the phase margin obtained in a unity-gain configuration? If it is required to have a phase margin of 75°, what must ft be reduced to? By what amount should CL be increased? What is the new value of SR?
D 13.30 Consider the folded-cascode op amp of Fig. 13.9 when loaded with a 10-pF capacitance. What should the bias current IB be to obtain a slew rate of at least 10 V/µs? If the input-stage transistors are biased at a current three times that at which each of Q3 and Q4 is biased, find the value of I. If the input-stage transistors are operated at overdrive voltages of 0.15 V, what is the unity-gain bandwidth realized? If the two nondominant poles have the same frequency of 50 MHz, what is the phase margin obtained in a unity-gain configuration? If it is required to have a phase margin of 75°, what must ft be reduced to? By what amount should CL be increased? What is the new value of SR?
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