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# lectureslides9 - Dependent sources As we begin to use...

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EE 442 dependent sources – 1 Dependent sources As we begin to use simple circuits to model more complex circuit behavior, we need to add some items to our tool kit. Dependent sources behave just like independent voltage and current sources, except their values are dependent in some way on another voltage or current in the circuit. This seems a bit odd, but this behavior corresponds very closely to the way a number of interesting and useful electronic devices behave. We’re not to try to get a detailed understanding of how these devices work internally – that’s the subject for an electronics or semiconductor class. However, we can form a reasonable model of how the electronic devices behaves in a circuit by using dependent sources.

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EE 442 dependent sources – 2 + Dependent voltage source V d = av 1 Dependent current source I d = bi 1 Here v 1 and i 1 are quantities defined somewhere else in the circuit, including the proper polarity or direction. These definitions must be included, or the circuit is not properly specified.
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