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EE 230
NAME ______________________
Exam 2
Spring 2010
Instructions:
There are 8 short questions and 5 problems.
The points allocated to each of
the questions are
as indicated.
The problems are all equally weighted with an assigned
weight of 16 points each.
All work should be included on the exam itself.
Attach
additional sheets only if you run out of space on a problem.
Students may bring 2 pages
of notes to the exam.
Calculators are permitted but can not be shared.
Questions:
1.
(2pts) What is a typical value for the input bias current for an operational
amplifier with FET inputs?
2.
(2pts) Why are the poles of a sinusoidal oscillator typically placed slightly in the
right half plane?
3.
(2pts)
What model for the op amp was needed to show that if the op amp input
terminals of the basic noninverting amplifier are interchanged, that resultant
circuit does not behave as an amplifier?
4.
(4 pts) If an op amp is modeled by the expression
()
GB
As=
s+p
±
and if the GB
of the op amp is 2MHz and the pole is located at 10 rad/sec, by how many dB
does the
gain drop as the frequency is increased from dc up to 10KHz?
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 Fall '08
 mina
 Amplifier, Operational Amplifier, Electronic amplifier

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