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bjtckts - R tc r e r R tc i b = v tb R tb r ib v b = r ib R...

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BJT Ampli fi er Small-Signal Equivalent Circuits ECE 3050 — Analog Electronics The BJT Common-Emitter Ampli fi er r e = V T I E r 0 e = R tb + r x 1 + β + r e r 0 = V A + V CE I C r ib = r x + (1 + β ) r e + R te (1 + β ) r 0 + R tc r 0 + R te + R tc r ic = r 0 + r 0 e k R te 1 α R te r 0 e + R te i b = v tb R tb + r ib v b = r ib R tb + r ib v tb i 0 c = α r 0 e + R te k r 0 r 0 R te / β r 0 + R te v tb i c = r ic r ic + R tc i 0 c v c = i 0 c ( r ic k R tc ) The BJT Common-Base Ampli fi er r e = V T I E r 0 e = R tb + r x 1 + β + r e r 0 = V A + V CE I C r ie = r 0 e k ( r 0 + R tc ) 1 α R tc r 0 e + r 0 + R tc r ic = r 0 + r 0 e k R te 1 α R te r 0 e + R te 1
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i e = v te R te + r ie v e = r ie R te + r ie v te i 0 c = 1 R te + r 0 e k r 0 α r 0 + r 0 e r 0 + r 0 e v te i c = r ic r ic + R tc i 0 c v c = i 0 c ( r ic k R tc ) The BJT Common-Collector Ampli fi er r e = V T I E r 0 e = R tb + r x 1 + β + r e r 0 = V A + V CE I C r ib = r x + (1 + β ) r e + R te (1 + β ) r 0 + R tc r 0 + R te + R tc r ie = r 0 e k ( r 0 + R tc ) 1
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Unformatted text preview: R tc r e + r + R tc i b = v tb R tb + r ib v b = r ib R tb + r ib v tb v e ( oc ) = v tb 1 + r e r + R tc / (1 + β ) i e = v e ( oc ) r ie + R te v e = R te r ie + R te v e ( oc ) 2...
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