# quiz5 - without feedback Different circuits called...

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UNIVERSITY OF CALIFORNIA College of Engineering Department of Electrical Engineering and Computer Sciences EE 42 / 100 Quiz 5 Spring 2008 th edition, then anwer the questions below. Submit your answers to bspace by 7AM on 3/6/2008. 1. (2 points) Timer circuits need one or more comparators for operation. An operational ampliﬁer can serve for this purpose. In the diagram shown below, the operational ampliﬁer is powered from a 0 V / 5 V supply. Sketch v o versus v in for v re f = 3.5 V. Note that there is no feedback and hence the voltage difference at the input of the opamp is not zero! (a) v o ( v in = 0 V ) = ? V (b) v o ( v in = 3.6 V ) = ? V This works well with ideal operational ampliﬁers, but practical opamps are very slow in this conﬁguration: it takes practical opamps up to a second for the output to change when used
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Unformatted text preview: without feedback. Different circuits called “comparators” are available. They have the same connections as opamps but are much faster in this conﬁguration. However they can only for voltage comparison, not ampliﬁcation. 2. (3 points) Redo Example 7.1 in Nilsson & Riedel, 8 th edition with the following changes: Current source: 20 A → 15 A, and Inductance: 2 H → 1 H. (a) i o ( t = 400 ms ) = ? A (b) v o ( t = 400 ms ) = ? V (c) Energy dissipated in the 10 Ω resistor in J 3. (5 points) Redo Example 7.4 in Nilsson & Riedel, 8 th edition for C 1 = 10 μ F, C 2 = 25 μ F, and resistance R = 200 k Ω . (a) v 1 ( t = 2 s ) = ? V (b) v 2 ( t = 3 s ) = ? V (c) w 1 = ? J (d) w 2 = ? J (e) w ∞ = ? J 1...
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## This note was uploaded on 08/01/2008 for the course EE 42/100 taught by Professor Boser during the Spring '08 term at Berkeley.

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