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A nnpn transistor has an emitter area of 10mm x10mm. The dopingconcentrations are as follows: in the emitterNd=1019 cm3, in the baseNa=1017 cm3, and the collectorNd=1015 cm3. The transistoris operating at T=300K. For electrons diffusing in the base,Ln=17mm and Dn=21.3cm2/s. For holes diffusing in the emitter,Lp=0.6mm and Dp=1.7cm2/s.Calculate Is and b whenthe base width W is a) 1mm and b)4mm. c) In the case where W=1um, whathappens to the gain if you decrease the emitter doping toNd=1018 cm3 ? d) In the case where W=1um, what happens to the gain if you increase the base doping toNa=1018 cm3 with the emitter andcollector doping the same as in part a)? e) Based on these results, if youwere to design a BJT, what physical and doping characteristics are required to achieve a large gain?
In a 50 KVA, Y connected, 440 V, 3 phase, 50 Hz alternator, the effective armature resistance is 0.25 ohms per phase. Synchronous reactance is 3.2 ohms per phase. Determine at rated load and unity power factor,
the hd cable signal send out is usually ranging between (1-25mv), with the frequency range from 1000Hz- 20Khz. An amplifier will gain 46 db will boost the signal before sending it through the cable connection.
A 3-phase induction motor, the equivalent rotor stand still reactance is equal to the reactance, while each resistance is (1/3)rd of this value. A torque of 500 Nmis developed at a slip of 5%. Calculate the maximum torque and thestarting torque.
A computer employs RAM chips of 256 x 8and ROM chips of 1024 x 8. The computer system needs 2K bytes of RAM, 4K bytes of ROM, and four interface units, each with four registers. A memory-mapped I/0 configuration is used.
Calculate the instantaneous power absorbed by the resistor, the instantaneous power absorbed by the capacitor, the real power absorbed by the resistor, the reactive power delivered by|the capacitor, the load power factor.
consider a random data paatern consisting of binary 1's and 0's , where the probability of obtaining either binary 1 or binary 0 is 2/3 and 1/3 respectively . calculate PSD for bipolar NRZ signaling .what is first null bandwidth of the signal.
a) A Si is doped with 10^17 boron atom/cm3. What is the electron concentration n0 at 300K. What is conductivity. b) A Ge sample is doped with 3x10^3 Sb atoms/cm3. Using the requirements of space charge neutrality
A) A capacitor has a plate area of 10 in^2, a plate separation of .1 mm and a teflon dielectric. Determine the capacitance of this capacitor. B) A 10 μF capacitor has 12 V applied. What is the separated charge stored on the plates
design a counter which runs from 2 to 12 usingD-flip-flop. My doubt was whether to consider the unused state asdont care or to link to next state, meaning self correcting.When imake it as self correcting there are too many expressions.
Brown and Vranesic. Problem 6.28 - Repeat Problem 6.26 using T flip-flops. Design a three-bit counterlike circuit controlled by the input w. If w = 1. then the counter adds 2 to its contents, wrapping around if the count reaches 8 or 9.
Assume the mass of the cup and water to be equal to the mass of water alone. Calculate the normal force FN for 300 g and 150 g.
A 10-uF capacitor has a voltage with the following time dependence:v(t)=20*[1-exp(-0.2*t)] in unit of Volt. Determine the current, power, and energy of the capacitor as a function of time
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