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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?
When a mass is attached to the end of the spring and allowed to come to rest,the vertical length of spring is 3.57 m. Calculate the elastic potential energy stored in the spring?
A US Department of Energy article states that a leak of one drip of hot water per second can cost $1.00 per month. Making reasonable assumptions about drop size and unit cost of energy, determine if this claim is reasonable.
The isentropic compressor efficiency is 80%. Refrigerant exits the condenser as a saturated liquid at 160 lbf/in.2 The mass flow rate of the refrigerant is 0.15 lb/s. Kinetic and potential energy changes are negligible as are changes in pressure f..
calculate the attractive force of equilibrium between a pair of k and br- ion that just touch eachother rk 0.133nm and
air flows through a converging-diverging nozzle with aeat 3.5. the upstream stagnation conditions are atmospheric the
What flow measuring devices are commonly used in industry? Explain the functioning of one such device.
Consider a system consisting of liquid water initially at T1 = 318 K, p1 = 3.5 bar undergoing a process to a final state at T2 = 353 K, p2 = 1.5 bar. Use appropriate equation with the data from the table to evaluate change in specific entropy.
If there are two balls of equal mass and of perfectly elastic material are lying on the floor. One of the ball with velocity v is made to struck the second ball. With which velocity both the balls move after impact
a mass of 0.25 kg of co2 at a temperature of 300 k and pressure of 100 kpa is heated at constant pressure to a volume
Use the f-chart to determine the amount of solar energy that can be delivered in Little Rock, AR, in January for the following solar and building conditions
The eye of a centrifugal compressor has a hub - tip radius ratio of 0.4, a maximum relative flow Mach number of 0.9, and an absolute flow that is uniform and completely axial.
a spherical buoy has a diameter of 1.5 mnbspweighs 8.50 kn and is anchored to the sea floornbspwith a cable as is shown
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