(a) Assuming negligible base currents in the alternative bandgap reference of Fig. P5.34, show that VBG 5 VBE2 1 KVT, K 5 (R2yR3) 3 ln[(R2yR1) 3 (Is2yIs1)]. (b) If Is2(25 8C) 5 2Is1(25 8C) 5 5 fA,...

(a) Assuming negligible base currents in the alternative bandgap reference of Fig. P5.34, show that VBG 5 VBE2 1 KVT, K 5 (R2yR3) 3 ln[(R2yR1) 3 (Is2yIs1)].

(b) If Is2(25 8C) 5 2Is1(25 8C) 5 5 fA, specify R1 through R3 for TC(VREF) 5 0 at T 5 25 8C under the constraint IC1 5 5IC2 5 0.2 mA. What is the value of VBG?