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1)Built-in voltage for a Si p-n junction is tested to be 0.6 V, NA = 2 X 10^15 cm^-3 on p side. Find ND on n side. (Assume ni = 1 x 10^10 cm^-3; and k*T/q= 0.026 V)
2)An ideal p-n junction diode has saturation current Is = 3e-15 A. Calculate the diode current when a (a) forward bias of 0.9 V is applied and (b) a reverse bias of -0.9 V is applied. Hint: at room temperature (k*T/q = 0.026 V)
3)A pn-junction is uniformly doped and has dopant concentration of NA = 4 x10^16 cm^-3 in the pregion at 300K. At zero bias, 20% of the total space charge region (W) is extended in the pregion. Calculate Vbi, ND, W, xn and xp. Given that ni = 1.8 x 10^6 cm-3 and e=1.16 x 10^-12 F/cm.
The capacitor has to have the following specifications: Needs to provide 100 horsepower for 10 hours Max operation voltage of 480V The min and max for the dielectric and metals are: 10 nm
A three-phase, 318.75-kVA, 2300-V alternator has an armature resistance of 0.35 /phase and a synchronous reactance of 1.2 /phase. Determine the no-load line-to-line generated voltage and the voltage regulation
A 26 resistor is connected across a 65 V battery. How much energy is used by the resistor in 5 min
Draw a strain gauge circuit and its external components to attach to a conveyor mounted only at the ends to measure the load at the center of the conveyor. What type of testing would you need to do to establish a baseline and calibration curve for..
Assume that life on Mars requires cell potential to be +100mV, and the extracellular concentrations of the three major species are following (mmol/L): Na+ : 145; K+ : 4; Cl- : 120. Choose one species and assume that other two permeabilities are ze..
The current in a 20 mH inductor is known to be i = 40 mA, t 0.
In a circuit, there is a resister, a conductor and a capacitor connected to voltage source. R = 25 ohms, L = 20 milliH, and C = 50 microF. a) Find the total impedance of the network if the frequency is 60 Hz.
An OpAMP has a unity gain frequency (ft) of 10MHz and a slew rate of 10V/us and AVoc = 120dB at DC (f=0). Assume VCC = -VEE = 15 Volts.a. Approximate the cutoff frequency of the OPAMP itself. b.
A 450 piece/hr 10 hr B 500 piece/hr 8 hr A set of unsharpen ed tools costs $1,500 and can be ground 15 times. The cost of each grinding is $20. The time required to change and reset the tools is 2 hours, and such changes are made by a tool-setter.
Semiconductor A has a bandgap of 2.5eV while semiconductor B has a bandgap of 1.5eV. What is the ratio of the intrinsic carrier concentrations in the two materials (niA/niB) at 300K
A p-type wafer has a diffused Phosphorous n-type junction with a junction depth of 0.15µm. a) If the wafer (no pre-existing oxide) is to be oxidized at 1000 C for two hours to form a ‘dense.
4 resistors are connected in electrical parallel. R1=2 OHM, R2= 4 OHM, R3= 6 OHM, R4= 8 OHM. if this parallel resistor combination is placed across an ideal current source = 3A.
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