Lecture_8 - • Related by source transformation •...

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1 BME 311 Network Theory John X.J. Zhang, UT Austin 1 Norton’s Theorem • A linear two-terminal circuit can be replaced by an equivalent circuit consisting of a current source I N in parallel with a resistor R N . I N : short-circuit current R N :the input resistance at the terminals when the independent sources are turned off. BME 311 Network Theory John X.J. Zhang, UT Austin 2 • Simplify circuit analysis – Series-parallel combination – Wye-delta transformation – Source transformation – Circuit theorems • Thevenin’s Theorem ( V s ,R ) • Norton’s Theorem ( i s ,R )
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2 BME 311 Network Theory John X.J. Zhang, UT Austin 3 Finding R N and I N • Norton and Thevenin resistance are equal (from source transformation) R N =R TH • Norton current I N =i sc I N =V TH / R TH V TH R N I N R TH BME 311 Network Theory John X.J. Zhang, UT Austin 4 Thevenin and Norton Equivalent Circuits
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Unformatted text preview: • Related by source transformation • “Thevenin-Norton Transformation” • To get Thevenin or Norton equivalent circuit, find V TH , I N , R TH TH TH N R V I = oc TH v V = sc N i I = N sc oc TH R i v R = = 3 BME 311 Network Theory John X.J. Zhang, UT Austin 5 Thevenin and Norton Equivalent Circuits • Isolate a portion of a network while the remaining portion of the network is replaced by an equivalent network • Related by source transformation • “Thevenin-Norton Transformation” • To get Thevenin or Norton equivalent circuit, find V TH , I N , R TH TH TH N R V I = oc TH v V = sc N i I = N sc oc TH R i v R = = BME 311 Network Theory John X.J. Zhang, UT Austin 6 • Obtain the Norton equivalent as viewed from terminals (a) a-b ; (b) c-d ....
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This note was uploaded on 09/28/2009 for the course BME 311 taught by Professor Zhang during the Spring '08 term at University of Texas.

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Lecture_8 - • Related by source transformation •...

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