University of Massachusetts, Lowell EECE 3650.  DEPARTMENT OF ELEC AND COMP ENG. Electronics I EECE 3650. Final Exam A. 125 Points Total.


DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
Final Exam Fall 2017 Electronics I EECE 3650
 
No communication with the outside world allowed.
 125 Points Total:
 Open notebooks are allowed. Calculators are allowed.
 You must do the first 3 questions and you must do 2 out
 of the last 4 questions for a total of 5 questions at 25
 points each. Please clearly indicate which 2 of the last 4
 questions you are attempting. If you do not indicate your
 preference, the first 5 questions will be used. If needed,
 use back of the sheets or extra sheets to show work.
 Question 1 (25 pts)
 In Q1, β=100, VBE = 0. 73, VA = ¥
Find IB.

Question (3) (25 pts)
In this circuit, the transistors have
? = 1 and |???| = 0.75
regardless of collector current.
Find V1 through V5
Question (4) (25 pts)
The pnp transistor has ? = 50
and ???= 0.68 regardless of ??.
The transistor is operating in the
saturation region. Find:
(a) ?forced
(b) VC
(c) to what value should RB
be raised to in order for the
transistor to operate at the edge
of saturation?
DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
Final Exam Fall 2017 Electronics I EECE 3650 December 15, 2017
 Question (7) (25 pts) (Transistor Amplifiers)
 Assume transistor is operating in the saturation region.)
 Find the minimum value of VDD
 to ensure operation in the saturation
 region. (5pts)