What happens to the gain if increase the base doping

Assignment Help Electrical Engineering

Reference no: EM13296151

A nnpn transistor has an emitter area of 10mm x10mm. The dopingconcentrations are as follows: in the emitterNd=1019 cm3, in the baseNa=1017 cm3, and the collectorNd=1015 cm3. The transistoris operating at T=300K. For electrons diffusing in the base,Ln=17mm and Dn=21.3cm2/s. For holes diffusing in the emitter,Lp=0.6mm and Dp=1.7cm2/s.
Calculate Is and b whenthe base width W is a) 1mm and b)4mm.
c) In the case where W=1um, whathappens to the gain if you decrease the emitter doping toNd=1018 cm3 ?
d) In the case where W=1um, what happens to the gain if you increase the base doping toNa=1018 cm3 with the emitter andcollector doping the same as in part a)?
e) Based on these results, if youwere to design a BJT, what physical and doping characteristics are required to achieve a large gain?

Reference no: EM13296151

Questions Cloud

Explain the corresponding microstates in a system consisting : Identify all the possible macrostate and the corresponding microstates in a system consisting of two communicating containers and four atoms

Should the us have universal health care : Should the US have universal health care? Why or why not? Cite references to back your opinion - We will have to make hard choices between competing goods, both as families and as a nation." Presidents Council on Bioethics.

How many dollars of revenue must the company generate : Circle K Furniture has a contribution margin ratio of 16%. If fixed costs are $176,800, how many dollars of revenue must the company generate in order to reach the break-even point? a) $1060,800 b) $1,105,000 c) $282,880 d)$208,476

How much would you save in total interest expense : Five years ago you took out a 30-year mortgage with an APR of 6.5% for $200,000. If you were to refinance the mortgage today for 20 years at an APR of 4.25% , how much would you save in total interest expense?

What happens to the gain if increase the base doping : A nnpn transistor has an emitter area of 10mm x10mm. The dopingconcentrations are as follows: in the emitterNd=1019 cm3, in the baseNa=1017 cm3, and the collectorNd=1015 cm3. The transistoris operating at T=300K.

Rank the compounds acetone and butane : Rank the compounds(acetone,butane,acetic acid, 2-propanol, 2-methylpropane, 1-propanol) by vapor pressure, label the one that has the lowest vapor pressure and the one that has the highest.

Determine the coefficient of performance of the heat pump : A heat pump is found to remove 2400 J of heat from the exterior of a house and deliver 3500 J of heat to the interior of the house

What is the present value of the contract : Note that, by contract, the deferred components are not paid in the year they are earned, but instead are paid (plus interest) 10 years later.

How much heat is extracted per cycle from the hot reservoir : A Carnot engine operates between hot and cold reservoirs with temperatures 527 Degrees Celsius and -73 Degrees Celsius. how much heat is extracted per cycle from the hot reservoir

User Account

All Pages