Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Questions  >  For the circuit shown,assume=100=hfe -10v 3k ... Start Learning for Free
For the circuit shown,assume=100=hfe -10v 3k vo 7k wwwm 3v 500 (a) find if the silicon transistor is in cutoff saturation or in the active region (b) find vo (c) find the minimum value for emitter resistor r, for which the transistor operates in the active region?
Most Upvoted Answer
For the circuit shown,assume=100=hfe -10v 3k vo 7k wwwm 3v 500 (a) fin...
Answer:

(a) Transistor Region:

To find the region of operation of the transistor, we need to check the base-emitter voltage (Vbe) and collector-emitter voltage (Vce).

Vbe = Vin - 0.7V = -10 - (-0.7) = -9.3V
Vce = Vo ≈ 0.7V (assuming the transistor is in active region)

Since Vbe is negative, the transistor is in the cutoff region.

(b) Output Voltage (Vo):

When the transistor is in cutoff, the output voltage (Vo) is equal to the supply voltage (Vcc). Hence, Vo = Vcc = 3V.

(c) Minimum Emitter Resistor (Rmin):

To operate the transistor in the active region, we need to ensure that the base current (Ib) is sufficient to drive the transistor into saturation. This can be achieved by selecting an appropriate value for the emitter resistor (Re).

The minimum value of Re can be calculated using the formula:

Rmin = (Vbe)/(Ibmin)

where Ibmin is the minimum base current required to ensure that the transistor is in saturation.

Assuming a saturation voltage (Vsat) of 0.2V and a collector current (Ic) of 1mA, we can calculate Ibmin as follows:

Ic = hfe * Ib
Ib = Ic/hfe = 1mA/100 = 10uA
Ibmin = Ib * (Vsat/Vbe) = 10uA * (0.2/0.7) = 2.86uA

Substituting the values in the formula for Rmin, we get:

Rmin = (-9.3V)/(2.86uA) ≈ 3.24MΩ

Therefore, the minimum value of the emitter resistor (Re) for which the transistor operates in the active region is 3.24MΩ.

Summary:

- The transistor is in cutoff region.
- The output voltage (Vo) is 3V.
- The minimum value of the emitter resistor (Re) for which the transistor operates in the active region is 3.24MΩ.
Explore Courses for Electrical Engineering (EE) exam

Top Courses for Electrical Engineering (EE)

For the circuit shown,assume=100=hfe -10v 3k vo 7k wwwm 3v 500 (a) find if the silicon transistor is in cutoff saturation or in the active region (b) find vo (c) find the minimum value for emitter resistor r, for which the transistor operates in the active region?
Question Description
For the circuit shown,assume=100=hfe -10v 3k vo 7k wwwm 3v 500 (a) find if the silicon transistor is in cutoff saturation or in the active region (b) find vo (c) find the minimum value for emitter resistor r, for which the transistor operates in the active region? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about For the circuit shown,assume=100=hfe -10v 3k vo 7k wwwm 3v 500 (a) find if the silicon transistor is in cutoff saturation or in the active region (b) find vo (c) find the minimum value for emitter resistor r, for which the transistor operates in the active region? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for For the circuit shown,assume=100=hfe -10v 3k vo 7k wwwm 3v 500 (a) find if the silicon transistor is in cutoff saturation or in the active region (b) find vo (c) find the minimum value for emitter resistor r, for which the transistor operates in the active region?.
Solutions for For the circuit shown,assume=100=hfe -10v 3k vo 7k wwwm 3v 500 (a) find if the silicon transistor is in cutoff saturation or in the active region (b) find vo (c) find the minimum value for emitter resistor r, for which the transistor operates in the active region? in English & in Hindi are available as part of our courses for Electrical Engineering (EE). Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free.
Here you can find the meaning of For the circuit shown,assume=100=hfe -10v 3k vo 7k wwwm 3v 500 (a) find if the silicon transistor is in cutoff saturation or in the active region (b) find vo (c) find the minimum value for emitter resistor r, for which the transistor operates in the active region? defined & explained in the simplest way possible. Besides giving the explanation of For the circuit shown,assume=100=hfe -10v 3k vo 7k wwwm 3v 500 (a) find if the silicon transistor is in cutoff saturation or in the active region (b) find vo (c) find the minimum value for emitter resistor r, for which the transistor operates in the active region?, a detailed solution for For the circuit shown,assume=100=hfe -10v 3k vo 7k wwwm 3v 500 (a) find if the silicon transistor is in cutoff saturation or in the active region (b) find vo (c) find the minimum value for emitter resistor r, for which the transistor operates in the active region? has been provided alongside types of For the circuit shown,assume=100=hfe -10v 3k vo 7k wwwm 3v 500 (a) find if the silicon transistor is in cutoff saturation or in the active region (b) find vo (c) find the minimum value for emitter resistor r, for which the transistor operates in the active region? theory, EduRev gives you an ample number of questions to practice For the circuit shown,assume=100=hfe -10v 3k vo 7k wwwm 3v 500 (a) find if the silicon transistor is in cutoff saturation or in the active region (b) find vo (c) find the minimum value for emitter resistor r, for which the transistor operates in the active region? tests, examples and also practice Electrical Engineering (EE) tests.
Explore Courses for Electrical Engineering (EE) exam

Top Courses for Electrical Engineering (EE)

Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev