Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Chapter 22, Problem 5SQ
To determine
Redraw Figure 22-3 for the tripped out condition of motor M2 and M3 due to overload.
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Can you solve for the voltage across 1kohm resistor when both voltage sources are on. Additionally can you solve for when 2V is shorted and 5V is on. Then, when 2V is on and 5V is shorted
a. A silicon sample maintained at room temperature is uniformly doped with ND=10¹6/cm³
donors. Calculate the resistivity of the sample.
b. The silicon sample of part (a) is "compensated" by adding NA=1016/cm³ acceptors. Calculate
the resistivity of the compensated sample.
c. Compute the resistivity of intrinsic silicon at room temperature.
d. A 500 resistor is to be made from a bar-shaped piece of n-type Si. The bar has a cross
sectional area of 102 cm² and a current-carrying length of 1 cm. Determine the doping
required.
μn or μp (cm²/V-sec)
1000
Electrons
Holes
NA or ND (cm³)
1x1014
Мет
Mp
(cm2V-sec)
1358
461
2
1357 460
100
5
1352
459
1 x 1015
1345
458
2
1332
455
5
1298
448
1 x 1016....
1248 437
2
1165 419
5
986 378
1 x 1017
801
331
10
1014
1015
1016
NA or ND (cm-³)
1017
1018
Silicon
T = 300 K
4. Two different silicon samples maintained at 300K are characterized by the energy band diagrams.
Answer the questions that follow after choosing a specific diagram for analysis.
a) Do equilibrium conditions prebail? How do you know?
b) Sketch the electrostatic potential (V) inside the semiconductor as a function of x.
c) Sketch the electric field (ε) inside the semiconductor as a function of x.
EF
Ec
E₁
Ev
E₁
EF
Ev
X
X
0
L/2
L
0
L/2
L
3.
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- Use PSpice to model the differential amplifier circuit shown in Fig. 4 in DIBO mode (double input balanced output). Use 2N3904 BJTs and use appropriate values for resistors (you can choose the values that will not lead to excessive gain and saturation) to demonstrate that the circuit provides differential amplification. Use Vcc = 5 and Vee = 5. Use a pair of sinusoids with opposing polarity (180 degree phase shift) as the inputs to the differential amplifier. Recall from the theory ic is needed to compute re. Make sure that the conditions set in the analysis of DIBO circuit are satisfied. Assume Rs1 = Rs2 50 Ω. Does your simulation match the theoretical gain? Explain any differences.arrow_forwardDerive the expression for the voltage gain of DIBO differential amplifier using AC analysis.arrow_forwardConsider the following circuit. + - 1.2 ΚΩ ig (1) vo ΣΕ ΚΩ € 50 nF 200 mH a) [6 pts] The frequency of the source current in the circuit is adjusted until vo is in phase with ig. What is the value of o in radians per second? (Hint: if vo is in phase with ig, the phase of total impedance must be zero (Ztot = vol ig), which means the phase of total admittance is zero. It will be easy to work with admittance in this question because the components are in parallel.) b) [2 pts] What is the total impedance at the frequency found in (a)? c) [2 pts] Ifig=2.5 cosoot mA (where o is the frequency found in [a]), what is the steady-state expression for vo?arrow_forward
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- Find Laplace inverse for -25 -1 e S-1arrow_forwardThis question and its solution. Is the solution correct? If the solution is correct, assume that let R2 = 20 and a=500 . If it is wrong, solve it in your own way, away from the sources, and explain to me in detail with a pen and paper, please.arrow_forwardcan you compute the values inside the blue circles using the data from the plan above them? Please disregard the values (data/numbers) inside the circles.arrow_forward
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