Simplified Forward-Active Region Model (Example 2)
• Problem: Estimate terminal currents, base-emitter and base-collector
voltages.
• Given data: IS = 10-16 A, aF = 0.95, VC = +5 V, IB = 100 mA • Assumptions: Simplified transport model assumptions, room
temperature operation, VT = 25.0 mV

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Simplified
Forward-Active Region Model(Example 3)•Problem: Find Q-point • Given data: bF = 50, bR = 1 VBC = VB - VC = -9 V • Assumptions: Forward-active region of operation, VBE = 0.7 V
2. (15 pts) An npn bipolar junction transistor is biased in the forward-active region. The common-base current gain, α 0.95. The input emitter current is IE-4.6 mA. a) Calculate the collector current Ic b) Calculate the common-emitter current gain, B c) Calculate the base current IB IB
A npn BJT has a B = 110 and a base current of iB = 50 μA. Calculate the collector current and the emitter current. Assume operation in the active region. Express the results in mA. (4 pts.)
The transistor in the circuit below has ?-100 and Vci(sat) OV. You may use the constant voltage model with VE 0.7V if the base emitter junction is forward biased. A variable DC source is attached to input VIN. Find the operating mode (cutoff, active, or saturation), the collector node voltage VC, and the collector current IC for each of the following cases: (a) VIN 0V (b) VIN = 1.2V (c) VIN 6.0v (d) VIN 12.0V 1 K IC VC 10K...
(2+5 pts) Consider the bias circuit below for a transistor amplifier designed for active region operation. The desired bias point parameters are lg = 3 mA and Ic = 2.97 mA. Assume VBE- 0.7 V and VT=25 mV. Determine the emitter voltage VE . Choose the best answer. VCC +15 V Vc RBB VB LVE V BB RE 500 S2 1.49 V O2v 01.5V O 0.7V
Given Beta=100.
c. What region of operation is the BJT operating in? How do you
know?
Hint: compare the voltages at the Base, Collector, and
Emitter.
d. Calculate theoretical calculations for VB, VC, VE, IB, IC, and
IE
V1 12E R4 470k R1 22k 01 Qbreakn R3 270k R2 16k 0
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a. Using the characteristics of Fig., determine Bac at IB 60 mA and VCE z4 V b. Using the characteristics of...
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Question 1 [Soalan 1] (a) Describe the condition when a npn BJT transistor operates in saturation condition and what are the terminal currents and voltages conditions during saturation. [Terangkan keadaan bila satu transistor BJT npn beroperasi dalam keadaan tepu dan apakah keadaan arus dan voltan terminal semasa tepu. ] (20 Marks/Markah) (b) Consider the BJT transistor circuit in Figure 1. If Bpc = 100 and VBE = 0.65V, calculate: [Pertimbangkan litar transistor BJT dalam Rajah 1. Jika Bpc =...
Electronics1. It's a multiple choices question. use the formula
sheet if needed (the last picture).
Question 4 CIRCUIT B2 (2.5 Marks) +Voc R ler Vic RS IB Vc V. RE FIG.4: CIRCUIT B2 Statement: Sketching relevant output (VIC) characteristics decide on Q-point coordinates and DC load-line details: That is, determine DC operating conditions of the NPN-BJT/Si circuit of Fig. 4 (denoting the type Circuit B2). Assume the following: Vor = 24 volt; Rc = 5.0 k; Re = 1000 ohm:...
Question 3. Unregulated supply Rz IL Vin IR Ib (a) The circuit on the right shows a series regulator connected to the output of an unregulated power supply. The transistor has B =50, and a 6 volt Zener diode is used. When the load current, Il, is 1 amp the de input voltage from the unregulated supply, Vin, is 11 volt, VBE = 1 volt and the Zener diode current, Iz, is 20 mA. For these conditions, calculate Iz (i)...