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240ln04 - AMPLIFIERS AS TWO-PORT NETWORKS LN#4 i1 v1 I1 =...

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1 AMPLIFIERS AS TWO-PORT NETWORKS LN #4 v 1 + - v 2 + - y 11 y 22 y 12 v 2 y 21 v 1 I 1 = y 11 v 1 + y 12 v 2 I 2 = y 21 v 1 + y 22 v 2 y 11 = i 1 /v 1 v2=0 Input admittance with output short y 12 = i 1 /v 2 v1=0 Reverse g m with input short y 21 = i 2 /v 1 v2=0 Forward g m with output short y 22 = i 2 /v 2 v1=0 Input admittance with output short i 1 i 2 Unilateral Amplifier y 12 =0 short circuit transconductance The result is a) y 11 is independent of output circuit b) y 22 is independent of input circuit Impedances are also used v 2 + - Z o G m v 1 Z i i 1 i 2 v 1 + - v 2 + - Z o a v v 1 Z i i 1 i 2 v 1 + - OR NORTON THEVENIN v 2 + - R o G m v 1 R i i 1 i 2 v in + - + - v 1 R s R L When you include LOADING EFFECTS
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