(a) Based on the defi nition of VOS1 of (a), calculate VOS1 if R2 is shorted out in Fig. 5.5. What is the new value of IC6 (5IC4)? (b) Repeat if R2 is lowered from 1 kV to 0.5 kV. (c) Repeat (a) and...

(a) Based on the defi nition of VOS1 of (a), calculate VOS1 if R2 is shorted out in Fig. 5.5. What is the new value of IC6 (5IC4)? (b) Repeat if R2 is lowered from 1 kV to 0.5 kV. (c) Repeat (a) and (b), but for R1 instead of R2. (d) Having demonstrated that altering the ratio R1yR2 unbalances the circuit by creating an offset, we can exploit this feature for nulling an existing offset, that is, for ensuring IC6 5 IC4 with VP 5 VN. If VOS1 5 15 mV, which of R1 or R2 must be lowered to null VOS1? What is the lowered resistance value, and what is the new value of IC6 (5IC4)?