ps11 - UNIVERSITY OF CALIFORNIA College of Engineering...

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College of Engineering Department of Electrical Engineering and Computer Sciences EE 42 / 100 Problem Set 11 Spring 2008 1. A capacitor C 1 is used to power a model airplane, represented in the circuit diagram below by resistor R 1 . Initially the capacitor is charged to voltage V 1 . Calculate the fraction r of the initial energy remaining on the capacitor when the current i 1 has decreased to 3 4 of its initial value. 2. In the circuit below C 1 represents a touch sensor. The comparator controls the position of the switch as follows: Whenever V o reaches the value V re f , the switch is set to position a . After V o drops to zero, the switch is set to position b . Touch is detected by measuring the frequency f o at which the switch position changes from position a to position b . (a) Derive an analytical expression for f o . Assume that the operational amplifier is ideal. Suggestion: sketch
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ps11 - UNIVERSITY OF CALIFORNIA College of Engineering...

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