Figure P5.42 shows how the IVR of the singlesupply active-loaded Q2-Q3 pair can be extended below ground potential by using the matched voltage followers/shifters Q1-Q4. Let Isn 5 5 fA, Isp 5 2 fA,...

Figure P5.42 shows how the IVR of the singlesupply active-loaded Q2-Q3 pair can be extended below ground potential by using the matched voltage followers/shifters Q1-Q4. Let Isn 5 5 fA, Isp 5 2 fA, and VAn 5 2VAp 5 50 V. (a) Assuming VEC(EOS) 5 175 mV and ignoring base currents, fi nd vIC(min) if the inputs were vB2 and vB3. (b) Repeat, but if the inputs are vB1 and vB4, as shown. What is the gain voy(vp 2 vn)? (c) Give a list of drawbacks stemming from the presence of the voltage followers.