hw5 - C t 7 Problemttl hap er ro . 7.1 Discuss the current...

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Unformatted text preview: C t 7 Problemttl hap er ro . 7.1 Discuss the current components in the n-p-n. Electrons are injected from emitter to base; most injected electrons are collected (2), but some recombine (1). The resulting loss of holes in the base is supplied by the base current (4), which also supplies holes for injection into the emitter (5). PVDHe/m #2— Prob. 7.2 Sketch band diagrams for n-p-n and p-n-p BJTs at equilibrium and normal bias. p-n-p "‘1’" E: T Equilibrium l Er Normal bias 70 Pmblm #3 For the diode connections shown, sketch 6p in the base. Which is the best ‘ Prob. 7. Z. diode .9 61) I I; I! <' ‘ Pu (a) 13 = Ic , 13 = 0. Since V is large, the collector is strongly reverse biased, Ape = -p,.. Since 13 = 1c, ApE = —Apc = p" from Eq.(7-34). The area under 5p(:cn) is zero. 6? APE aApE 3n 0 W5 (c) Since 10 = 0, Apc = aApg from Eq.(7-34b). I 6? W H In 0 Wb (b) ch = 0, thus Ape = 0. Notice that this is the narrow-base diode distribution. 0 W5 (d) V55 = Vca = V. Thus Ape = A1); Connection (1)) gives the best diode since the stored charge is least; (a) is not a good diode since the current is small and symmetrical about V = 0. 84 Problem. #- if is reverse biased with 0.6 V. The band diagram must be drawn to scale Your band diagram shnuld include: the fen-mi levels the local vacuum level the depletion charge (+ or -) in the forbidden band C the conduction band edge the valence band edge 06V -1.0 ...
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hw5 - C t 7 Problemttl hap er ro . 7.1 Discuss the current...

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