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EE40 Fall 1999
Mid Term 1
Profeessor
Problem
Fill in the logic values in the table below for input values given. Note that the value for "C" is given as an example.
write the Intermediate Values and Outputs for A=1, B=0 : C D E F G H I Value
e. All logic blocks in the above figures havea unit gate delay of 10n sec.
Show the logic values versus time(for t=0 to 70n sec) for outputs C and D of example a, given logic input values (A and B) shown below.
Problem
"circuit solution by inspection"
EE40 Fall 1999 Mid Term 1 Profeessor 1
Each of these problems should take no more than 1-2 minutes. WRITE ANSWER IN PLACE PROVIDED. there is no partial credit on these problems a.
Vab = ____v
b.
Vcd = _____v
c.
P = ____w
d.
I1 = _____microAmps
g.
Vx = ___V
Problem
Initial Conditions
In each of the problems below, find the value of the current or voltage just after the switch moves (i = 0+). (What is requested is just a numerical value, Not an equation or function of time.
a.
iR= ___ microAmps
b.
Vc = ____v
c.
must put the equations in the space indicated below
Problem
The following circuit is used to study one phase of the operation of a DRAM cell __ the slow decay of a stored "I". First the switch S1 is closed and kept closed to write a "I". Then it opens and the storage capacitor Cb is supposed to maintain the stored inforamtion. In this memory, a valid "I" is any voltage Vb in the range of 1 to 3V.
a. What is the value of Vb just after the switch S opens, i.e. at t = 0+? (1% accuracy is sufficient.)
b. What is the value of Vb much later, (e.g. 1 hour later)?
c. on the axes provided on the facing page, neatly sketch the graph of Vb(t) versus time. You must label the axes with units
d. Write an equation for Vb as a function of time.
Problem
a. Find the Thevenin Equivalent Circuit of the following
Vt = ___V Rt = ___Kohms
b. Find the Norton Equivalent of the folowing linear circuit:
Vn = ___V
Rn = ___Kohms
c. Find the powers supplied by the voltage source in the following circuit.
Power out = ____ W
Posted by HKN (Electrical Engineering and Computer Science Honor Society)
University of California at Berkeley
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