Electronics and Communication Engineering (ECE) Exam > Electronics and Communication Engineering (ECE) Questions > The diode in the circuit of Fig. E4.9 is a la...
Start Learning for Free
The diode in the circuit of Fig. E4.9 is a large high-current device whose reverse leakage is reasonably independent of voltage. If V = 1 V at 20C, find the value of V at 40C and at?
Most Upvoted Answer
The diode in the circuit of Fig. E4.9 is a large high-current device w...
Solution:
Given parameters:
- V1 = 1 V at 20°C
- T1 = 20°C
- T2 = 40°C
To find:
- V2 at 40°C
- V3 at ?
Assuming the diode is ideal, we can use the Shockley equation to find the voltage drop across it:
V = Vt*ln(I/Is)
Where,
- V = voltage
- Vt = thermal voltage (kT/q), where k is Boltzmann's constant, T is temperature in Kelvin, and q is the charge of an electron
- I = current through the diode
- Is = reverse saturation current
We can assume that the forward voltage drop of the diode is negligible compared to the reverse leakage current, so we can use the reverse saturation current as the current through the diode.
At 20°C:
V1 = Vt*ln(Is)
Is = exp(V1/Vt)
At 40°C:
Is2 = exp(V2/Vt)
Since the reverse leakage is reasonably independent of voltage, we can assume that Is2 is equal to Is, so we can set the two equations equal to each other:
exp(V1/Vt) = exp(V2/Vt)
Taking the natural logarithm of both sides:
V2/Vt = V1/Vt
V2 = V1 * (T2/T1)
V2 = 1 V * (313 K/293 K) = 1.07 V
To find V3, we need to know the temperature. Assuming we know the temperature, we can use the same equation:
V3 = V1 * (T3/T1)
Where T3 is the temperature in Kelvin.
Given parameters:
- V1 = 1 V at 20°C
- T1 = 20°C
- T2 = 40°C
To find:
- V2 at 40°C
- V3 at ?
Assuming the diode is ideal, we can use the Shockley equation to find the voltage drop across it:
V = Vt*ln(I/Is)
Where,
- V = voltage
- Vt = thermal voltage (kT/q), where k is Boltzmann's constant, T is temperature in Kelvin, and q is the charge of an electron
- I = current through the diode
- Is = reverse saturation current
We can assume that the forward voltage drop of the diode is negligible compared to the reverse leakage current, so we can use the reverse saturation current as the current through the diode.
At 20°C:
V1 = Vt*ln(Is)
Is = exp(V1/Vt)
At 40°C:
Is2 = exp(V2/Vt)
Since the reverse leakage is reasonably independent of voltage, we can assume that Is2 is equal to Is, so we can set the two equations equal to each other:
exp(V1/Vt) = exp(V2/Vt)
Taking the natural logarithm of both sides:
V2/Vt = V1/Vt
V2 = V1 * (T2/T1)
V2 = 1 V * (313 K/293 K) = 1.07 V
To find V3, we need to know the temperature. Assuming we know the temperature, we can use the same equation:
V3 = V1 * (T3/T1)
Where T3 is the temperature in Kelvin.
Attention Electronics and Communication Engineering (ECE) Students!
To make sure you are not studying endlessly, EduRev has designed Electronics and Communication Engineering (ECE) study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Electronics and Communication Engineering (ECE).
|
Explore Courses for Electronics and Communication Engineering (ECE) exam
|
|
Similar Electronics and Communication Engineering (ECE) Doubts
Top Courses for Electronics and Communication Engineering (ECE)View all
The diode in the circuit of Fig. E4.9 is a large high-current device whose reverse leakage is reasonably independent of voltage. If V = 1 V at 20C, find the value of V at 40C and at?
Question Description
The diode in the circuit of Fig. E4.9 is a large high-current device whose reverse leakage is reasonably independent of voltage. If V = 1 V at 20C, find the value of V at 40C and at? for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) preparation. The Question and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus. Information about The diode in the circuit of Fig. E4.9 is a large high-current device whose reverse leakage is reasonably independent of voltage. If V = 1 V at 20C, find the value of V at 40C and at? covers all topics & solutions for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The diode in the circuit of Fig. E4.9 is a large high-current device whose reverse leakage is reasonably independent of voltage. If V = 1 V at 20C, find the value of V at 40C and at?.
The diode in the circuit of Fig. E4.9 is a large high-current device whose reverse leakage is reasonably independent of voltage. If V = 1 V at 20C, find the value of V at 40C and at? for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) preparation. The Question and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus. Information about The diode in the circuit of Fig. E4.9 is a large high-current device whose reverse leakage is reasonably independent of voltage. If V = 1 V at 20C, find the value of V at 40C and at? covers all topics & solutions for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The diode in the circuit of Fig. E4.9 is a large high-current device whose reverse leakage is reasonably independent of voltage. If V = 1 V at 20C, find the value of V at 40C and at?.
Solutions for The diode in the circuit of Fig. E4.9 is a large high-current device whose reverse leakage is reasonably independent of voltage. If V = 1 V at 20C, find the value of V at 40C and at? in English & in Hindi are available as part of our courses for Electronics and Communication Engineering (ECE).
Download more important topics, notes, lectures and mock test series for Electronics and Communication Engineering (ECE) Exam by signing up for free.
Here you can find the meaning of The diode in the circuit of Fig. E4.9 is a large high-current device whose reverse leakage is reasonably independent of voltage. If V = 1 V at 20C, find the value of V at 40C and at? defined & explained in the simplest way possible. Besides giving the explanation of
The diode in the circuit of Fig. E4.9 is a large high-current device whose reverse leakage is reasonably independent of voltage. If V = 1 V at 20C, find the value of V at 40C and at?, a detailed solution for The diode in the circuit of Fig. E4.9 is a large high-current device whose reverse leakage is reasonably independent of voltage. If V = 1 V at 20C, find the value of V at 40C and at? has been provided alongside types of The diode in the circuit of Fig. E4.9 is a large high-current device whose reverse leakage is reasonably independent of voltage. If V = 1 V at 20C, find the value of V at 40C and at? theory, EduRev gives you an
ample number of questions to practice The diode in the circuit of Fig. E4.9 is a large high-current device whose reverse leakage is reasonably independent of voltage. If V = 1 V at 20C, find the value of V at 40C and at? tests, examples and also practice Electronics and Communication Engineering (ECE) tests.
|
|
Explore Courses for Electronics and Communication Engineering (ECE) exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
x
![]()
For Your Perfect Score in Electronics and Communication Engineering (ECE)
The Best you need at One Place
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup