12.10 (a) Refer to Fig. 12.18. Show that, for the composite pnp transistor,
Hence show that
and thus the transistor has an effective scale current
where ISP is the scale current of the pnp transistor Q1.
(b) For βP = 20, βN = 50, ISP = 10−14 A, find the effective current gain of the compound device and its vEB when iC = 100 mA.
(b) 1000; 0.651 V