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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?
ater is the working fluid in a regenerative rankine cycle. the pressure andnbsptemperature at the turbine inlet are
the critical shear stress for a crystal material is 3250 psi. if the angle of slip direction is 430 and the normal to
If the current world spare capacity is 2 mbpd and the OPEC total production does not increase beyond 33 mbpd, how many years will it take for the spare capacity to fall below 1 mbpd again?
a liquid zone control unit has a diameter of 10 inches. the water is filled to a height of 0.5m. the thermal neutron
on an overflow structure of 50 degrees slope the water depth measured normal to the surface of the structure is 1.2 m 4
A sheet of BCC iron 1.7-mm thick was exposed to a carburizing atmosphere on one side and a decarburizing atmosphere on the other side at 725°C. After having reached steady state, the iron was quickly cooled to room temperature. The carbon concentrati..
nitrogen gas is compressed from pressure 80kpa and temperature 27degrees celsius to pressure 480kpa by a 10kw
Evaluate the effect of the water spray on efficiency (net work out divided by heat input) and net power out per kg/s of dry air coming into the turbine.
Assuming that the stress distribution does not vary with respect to z. determine the net force in the x direction and the net moment about the z axis. The stress distribution is sigma x = 2000 y + 500 psi.
Design an analog circuit with the following specifications
in a window unit of air conditioners the temperature of the room to be cooled is around 20oc rather than -20oc as in
Two tow trucks lift a 100 lb motorcycle out of a ravine following an accident. If the motorcycle is in equilibrium in the position shown, what are the tensions in cables AB and AC?
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