A voltage VCM is applied to both inputs of a MOS differential amplifier. Assume VDD = VSS = 1.5V, Kn = 4mA/V2 , VT = 0.5V, IREF = 0.4mA, and RD = 2.5 kΩ. Assume that the current source requires a minimum of 0.4V to operate properly. a. Find VGS. b. For VCM = 0V, find VS, ID1, ID2, VD1,and VD2. c. Repeat (b) for VCM = +1 V. d. Repeat (b) for VCM = -0.2V. e. What is the highest permitted value of VCM (to keep M1 and M2 in saturation)? f. What is the lowest value allowed for VCM (to satisfy the voltage requirement of the current source)?

Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.

Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?