Electronics-I Lecture 05

Electronics-I Lecture 05 - Smallsignalmodel Lecture 05...

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Lecture 05 Electronics I 1 Small-signal model
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Lecture 05 Electronics I 2 Small-signal model In the absence of signal v d (t)  When signal v d (t) is applied Instantaneous diode voltage Corresponding diode current Substituting diode voltage v D (t)  Rewritten as   Substituting I D   T D nV V S D e I I / = ) t ( v V ) t ( v d D D + = T D nV v S D e I t i / ) ( = T d D nV v V S D e I t i / ) ( ) ( + = T d T D nV / v nV / V S D e e I ) t ( i = T d nV / v D D e I ) t ( i =
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Electronics I 3 Small-signal model If amplitude of v d (t) is small such that Exponential is expanded in a series with only  first two terms Small-signal approximation valid for signals with  amplitudes  smaller than 10 mV for n = 2, V T = 25 mV smaller than 5 mV for n = 1, V T = 25 mV 1 << T d nV v + T d D D nV v 1 I ) t ( i ..... ! 2
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Electronics-I Lecture 05 - Smallsignalmodel Lecture 05...

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