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# Write_Up4 - C. Calculations: In Lab 4, there were not many...

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C. Calculations: In Lab 4, there were not many calculations necessary to complete the lab. In the pre-lab, the students were required to calculate the input voltage that causes the output of the comparator to change from low to high and the reference voltage. To calculate the value of the input voltage, the properties of ideal operational amplifiers are employed. For all ideal operational amplifiers, the input current will be zero for the positive and negative nodes and the voltage at the positive node will be equal to the voltage at the negative node. The reference voltage can be calculated through manipulations of the node-voltage method. This calculation is: V V k k k R = + * . . 2 2 2 2 1 0 where V R is the reference voltage and V is the voltage above the 10k ohm resistor which for this problem is 12V. After plugging in known numbers, the reference voltage is found to be 2.164V. To calculate the input voltage that will change the output of the comparator from high to low, it is important to realize the input current is zero. Therefore:

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## This note was uploaded on 11/03/2009 for the course ECEN 214 taught by Professor Su during the Spring '08 term at Texas A&M.

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Write_Up4 - C. Calculations: In Lab 4, there were not many...

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