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210 bytes added ,  02:08, 22 September 2015
Line 576: Line 576:  
   N.B. the convention in existing device models is that pin currents are  
 
   N.B. the convention in existing device models is that pin currents are  
 
       assumed to be entering the device
 
       assumed to be entering the device
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<math>
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\begin{array}
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i^{+} = I(t)\\
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i^{-} = -I(t)\\
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V(t) = v^{+} - v^{-}
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\end{array}
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</math>
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 +
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Now define the local state vector
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<math>
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z =
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\left[
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\begin{array}
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v^{+}\\
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v^{-}\\
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x
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\end{array}
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\right]
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</math>
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