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The lateral base resistance is a fundamental limitation of high-frequency and high speed performance of BJTs. At low temperatures, deionization of the dopant impurity could increase the base resistance much more than the increase of mobility because of lower phonon scattering at lower temperatures. What is the base resistance at 77K corresponding to the 300K base resistance calculated in (736.6). Take into account each of the following factors individually in a n/p/n transistor and show how much effect each contributes: the deionization of the acceptor dopant impurity in the base layer at low temperatures, the increase of mobility due to less phonon scattering and the decrease of mobility due to more ionized and neutral impurity scattering. Use the result of chapter 3 to calculate the mobility due to ionized and neutral impurity scattering. Since some of these factors improve and others degrade as the temperature is lowered, is there a temperature where rb, is a minimum and what is it if there is in this example?
1. which has the larger area moment of inertia a 2 x 2 square beam of high strength stainless steel or a 2 x 2 square
Water is boiled at sea level in a coffee maker equipped with an immersion-type electric heating element. The coffee maker contains 1 L of water when full. Once boiling starts, it is observed that half of the water in the coffee maker evaporates in 25..
a tool chest has 980 n weight that acts through the midpoint of the chest. the chest is supported by feet at a and
a cylinder fitted with a piston contains 10 lbm of r-134a at 100 psia and 140 degree f. the refrigerant is cooled at
a curved nozzle assembly that discharges to the atmosphere is shown. The nozzle mass is 4.5 kg and its internal volume is 0.002 m^3. The fluid is water. determine the reaction force exerted by the nozzle on the coupling to the inlet pipe.
However, suppose the matrix were chunked by rows, so that a Map task is given the hash functions and a set of rows to work on. Design Map and Reduce functions to exploit Map Reduce with data in this form.
determine the repeat distance linear density and packing fraction for bcc lithium which has a lattice parameter of
When isotherms for a Van der Waals gas are plotted on a p-V diagram, which are the considerations?
a frictionless piston cylinder device contains 5kg of air at 200kpa and 25 degree c. the air is compressed slowly to a
a diffuser is a device that the flow of air in order to recover a pressure loss. for the diffuser shown in the attached
a system executes a power cycle while receiving 1050 kj by heat transfer at a temperature of 525 k and discharging 700
2-kg of potatoes are put on a spring scale that is displaced 2.50 cm as a result. If the scale is pushed down 2 cm from the equilibrium position and allowed to oscillate, what will be the frequency of the motion in Hertz?
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