Study with the several resources on Docsity
Earn points by helping other students or get them with a premium plan
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Community
Ask the community for help and clear up your study doubts
Discover the best universities in your country according to Docsity users
Free resources
Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors
The spring 2005 exam for ece 250, which includes multiple problems related to circuit analysis, waveforms, transfer curves, and diode characteristics. Students are required to sketch waveforms, plot transfer curves, determine the units of constants, find the resistance of a device, and calculate the concentration of electrons and holes in a pn diode.
Typology: Exams
1 / 7
This page cannot be seen from the preview
Don't miss anything!
I pledge on my honor that I did not copy any of this exam, and that this work is entirely my own. Furthermore, I did not use PSpice during this exam.
Problem 1 (25 Points): Plot Vo(t) and Vin(t) for the circuit below. Indicate numerical values for all breakpoints. Let Vin be a ±15 volt triangle wave. The two resistors are equal. R
Vin
3V
R
Vo
a) Sketch the waveforms using the graph below (17 Points):
Time
0s 0.2s 0.4s 0.6s 0.8s 1.0s 1.2s 1.4s 1.6s 1.8s 2.0s 0
0
5
10
15
b) Sketch the transfer curve, Vo versus Vin (8 Points).
Problem 3 (25 Points):
In the homework, we saw a tunnel diode similar to the one below.
R
V1 (^) D
Over the weekend, I measured the I-V characteristic for this device and fit the following equation to measured curve:
( ) ⎪⎩
0 ForV 0 V
ρ a b ForV 0 V I D
D D
2 D
3 D V^ D V V Where^ ρ^ = 0.001, a = 6, b = 9.
a) What are the units for the constants ρ, a, and b? (5 Points) b) What is the resistance of this device at VD = 2 V and I (^) D = 2 mA? (10 Points) c) Create a piece-wise-linear model for this device at VD = 2 V and I (^) D = 2 mA. (10 Points)
