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A set of 4 µm wide windows are to be etched into a SiO2 film of thickness 0.8µm.
a) Find the dimension of the window, as measured at the top of the oxide, after ideal isotropic etching (i.e. no overetch). Draw a cross section of the window opening with the resist still on.
b) What is the dimension of the window at the oxide substrate interface.
c) Find the average slope of the window edge.
d) Repeat the above question a), b) and c) if the process was done with a 20% over-etch, assuming that the silicon is etched at 2% of the oxide etch.
e) what type of Si wafer (orientation) and chemical etchant would be needed to make a perfectly vertical wet etch for these 4 µm wide windows? Comment on the practicality of such an etch.
1.How is crude oil formed ?How is it found/discovered ? 2.How is natural gas formed? (Start with plankton) and include crude oil formation.
With conditions remaining the same as in part (a), we would like to reduce the relative deadline for T3 to improve the quality of service. What is the shortest deadline that we can choose for task T3 such that all tasks will meet their deadlines
1.Calculate motor speed in revolutions per minute for an eight-pole,50Hz motor. Give the equation and identify its parts; show your math. 2.You need to detect finished products coming down an assembly line.
How long will the cassette tape player operate at normal power? A walker's cassette tape player uses 4 AA batteries in series to provide 6V to the player circuit.
A sinusoidal voltage wave of real amplitude B0, and frequency w, and phase constant B, propogate in the forward z direction toward the shorted load end in a lossless transmission line of characteristic impedance Z0.
150 kVA, 2400/240 V single-phase transformer has the parameters. (a) Determine the equivalent circuit referred to the high-voltage side. (b) Find the primary voltage and voltage regulation when transformer is operating
A small magnetic needle, which is free to turn slowly in a horizontal plane, is placed at the center of the coil in question (6). Show that it will set at an angle \(\phi\) to B where \(cot(\phi) = 4R/(\pi n^2 \mu_{o}\omega a)\)
Saw on internet some equations to convert from frequency in hertz to mph. Some equations need a gear ratio while others do not. I found the equation mph = circumference * RPM * 60.
A continuous time system, describes by y(t) = 5 Cos (2*pi*20*t+pi/2), is sampled at rate 320 Hz. a) Write the mathematical expression that describes the discrete time (sampled) signal. b) Calculate the value of the discrete signal for n=0 and n=4.
A container with a plunger compresses one pound mole of an ideal gas from 1 atmospheres pressure to 10 atmospheres. Calculate the amount of work done if the process is considered to be polytropic.
A 150MW alternator generates an open-circut line-t0-line voltage of 12kV at nomial DC excitiation. When the terminals are placed in short-circuit the resulting current per phase is 8000A.
A balanced three-phase inductive load is supplied in steady state by a balanced three-phase voltage source with a phase voltage of 120Vrms. The load draws a total of 10kW at a power factor of 0.9.
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