(a) In the circuit of the power supply has been adjusted so as to result in VBC 5 0 with the switch open. In this state, the effective base width is WB 5 500 nm, and the portion of the B-C SCL...

(a) In the circuit of the power supply has been adjusted so as to result in VBC 5 0 with the switch open. In this state, the effective base width is WB 5 500 nm, and the portion of the B-C SCL extending onto the base region has the width xp 5 20 nm. What is the value of F?

(b) If the switch is closed, the B-C junction becomes reverse biased by 10 V, and xp widens, shrinking WB, and increasing IC (Early effect). Assuming the B-C junction has the built-in potential c 5 0.8 V and the grading coeffi - cient mc 5 0.5, estimate the changes in xp, WB, and IC as a consequence of switch closure.

(c) Use the change in IC to indirectly estimate the Early voltage VA.