1.1 In an npn transistor, the emitter is heavily doped: a) to increase the efficiency of carrier collection at the emitter. b) to minimize the density of holes passing to the emitter. c) to minimize the density of holes arriving from the base. d) to maximize the density of electrons arriving from the base.
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Q: Q.1: A transistor has a collector current of 10 mA and a base current of 40 micro-A. What is the…
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Q: Calculate the transistor’s Collector current if it is driven by a small Base current of 1.96mA with…
A: Given data : Base current , IB = 1.96 mA Emitter current , IE = 100 mA
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A: Given: T=300KNa=1016 cm-3 Nd=1015 cm-3Vrev=5Vni=1.5*1010 cm-3εs=1.035*10-12 F/cm
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Q: Calculate the transistor collector current if it is driven by a small base current of 7mA with a…
A: Answer :- Given Base Current( IB) = 7 mA Emitter Current ( IE) = 10 mA Collector Current (IC) = ?…
Q: A p-n junction has a saturation current of 6.40 mA. (a) At a temperature of 300 K, what voltage is…
A: Given- Saturation current (Is) = 6.40mA. Temperature (T) = 300 k
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- Q1/ Fill in the blanks with the correct answer. 1. The net drift current is got from the movement of the both 2. The units of drift current density is and 3. The velocity characteristics of the particle is affected by and 4. There are two collision or scattering mechanisms that dominate in a semiconductor and affect the carrier mobility: and 5. Mobility that is due to lattice scattering increases as the temperature decreases due to 6. In the lower temperature range, freeze-out begins to occur; the electron concentration and conductivity decrease with decreasing temperature due to 7. The semiconductors that have negative resistance be useful in the 8. There are a two mechanisms, that can induce a current in a semiconductor, devices. and 9. Consider a piece semiconductor the geometrical parameters (L= 0.1 cm, W = 0.1 cm, and d = 10-³ cm). Also assume the Hall effect parameters that Ix 1.0 mA, V = 2.5 V, B₂ = 500 gauss 5 x 10-2 tesla, and VH = 6.25 mV, then the majority carrier type is =…1. Define packing fraction.mention some example? 2. The primitive cells in reciprocal space is known as the.........?a. We discussed in class the "two conditions" that allow current to flow through a MOSFET, and "two conditions" that would not allow current to flow. Write down what these conditions are: b. Consider a n-channel MOSFET and a p-channel MOSFET. How would you connect these two transistors in order to create a basic CMOS Inverter, as discussed in class. c. Now consider a floating gate, containing electrons. Use Gauss' Law to explain whether or not inversion can occur in the channel if a positive gate voltage were to be applied d. Depending on whether or not current flows through the channel, what does this tell you about whether or not you have stored a "0" or a “1”? e. Use principles of Coulomb's Law to explain how you would remove electrons from the floating gate (i.e. to "flash" your flash memory device)
- Prob. 2. Energy Band Diagrams For the energy band diagram shown below answer the following: a. Label the n side and the p side b. Determine majority the carrier concentration at x = 0 and x = Land what type of carrier. c. Determine the built-in potential d. Which side has a more positive potential, x = 0 or x = L? Explain your reasoning. E Ec 0.288 ev E, 0.467 ev E, x=0 x = LBand Gaps The energy gaps between the valence and conduction bands are called band gaps. For silicon, the band gap is 1.1 eV; for fused silica glass, it is 9.3 eV. Part A What is the wavelength A of a photon that has energy 1.1 eV? Express your answer in nanometers to two significant figures. I'VD, αβ, ΔΣ, λ = reset shortcuts ? helpUse T if it's True and F if it's False. Justify I. A semiconductor is characterized by having a very wide forbidden band, between conduction and valence.II. The band of the Energetic Interval where there are those electrons that can move freely and are free from the attraction of the atom is called conduction.III. In a semiconductor with donor atoms (for example P in Si), the donor level is just below the conduction band.IV. A diode will conduct current in only one direction and act as an open circuit when the current tries to move in the opposite direction.
- The neutrons in a neutron star (Chapter 44 in the textbook) can be treated as a Fermi gas with neutrons in place of the electrons in our model of an electron gas. ▼ Part A Determine the Fermi energy for a neutron star of radius 12 km and mass 2.0 times that of our Sun. Assume that the star is made entirely of neutrons and is of uniform density Express your answer using two significant figures. By Submit 192| ΑΣΦ 4 Request Answer → ? MeVQuestion 3. L- ] What is the impact of temperature on the probability of finding the electron in the conduction band. b) [. What is the fermi energy level? How can we change it? a)A slab of intrinsic Silicon (at room temperature) is biased, the applied electricfield inside the slab is |?⃗ | = 1.0x103 V/cm. a) What is the drift speed of the electronsb) Calculate the mean free time for electronsc) What is the average distance travelled between collisions (mean free path)d) Compare the answer in part c to the mean free path along the drift directione) What is the hole drift current density Jpd
- Q1 The mobility of the electrons and the holes in an intrinsic germanium m? ) and (0.17. V.sec. -) respectively, the at a certain temperature is (0.36- V.sec. concentration of the electrons and the holes equals (2.5x109 / m² ). Calculate the conductivity. -1 Ans.) 2.12 (N.m)For the circuit shown a) Determine the mode of operation that the transistor is in. Assume that V1>0. Show work to justify your reasoning. b) Sketch la vs V1 (this plot may be qualitative) la(a) With respect to Op-amp used as Rectifier explain the following: i) What is the role of the diodes in full wave rectifier. Explain with diagram. ii) How is the negative half of input signal rectified using full wave rectifier. Explain with calculations and diagram. iii) What is the role of diode in feedback bath in half eave recitifier. Explain with diagram. 3.