{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

W2011_221A_HW4_soln

# W2011_221A_HW4_soln - Prob 6.31 Prob 6.32 Part C Under high...

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Prob. 6.31 Prob. 6.32 Part. C: Under high injection conditions, electric field increases from left to right in the sub-collector region (as shown in previous part). Breakdown field in material A is less than that in material B. To obtain a higher breakdown voltage, material A should be placed in a low-field region and material B should be placed in a high-field region. Hence, material A should be placed next to the base. Prob. 7.7 Identify which gives the best diode characteristics. ApE (a) IE = Ic , IB =• 0- Since V is large, the collector is strongly reverse biased, Ape = —PnSince Is = Ic, APE = —Ape = pn from Eq.(7-34). The area under Sp(xn) is zero. S? + «fn:<& (b) VCB = 0, thus Ape = 0. Notice that this is the narrow-base diode distribution. Sp 901 V Aps ApE Ape ctApE 0 Wh (c) Since Ic = 0, Ape = aAps from Eq.(7-34b). Wh (d) VEB = VCB = V. TAtw Ape = Ap£ Connection (b) gives the best diode since the stored charge is least and the current is good. Connection (a) is not a good diode since the current is small and symmetrical about V=0. Connections (c) and (d) are not good diodes because the stored charge is high. ...
View Full Document

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern