lecture 32

# lecture 32 - 1 Summary of Lecture#32 General-purpose...

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Unformatted text preview: 1 Summary of Lecture #32 11/08/2010 General-purpose 2nd-order RC active filters Kerwin-Huelsman-Newcomb filters (KHN filters) • Summing circuits • Difference circuits • Integrator circuits • Auxiliary equation • Flaw chart having two integrators and a summer • Circuit in terms of a 1 and a 2 • Summer in terms of b , b 1 and b 2 • General purpose second order RC active filters 1 1 2 2 1 2 2 s s H(s) K s b b b a a s + + = + + General-purpose 2nd-order RC active filters Kerwin-Huelsman-Newcomb filters (KHN filters) V in → → V out 2 out 1 2 2 in 1 2 V (s) b s b s b H(s) K V (s) s a s a + + = = + + • General summing circuits out 1 1 2 2 3 3 V (s) G V (s) G V (s) G V (s) = --- ⋯ • G 1 , G 2 etc., are conductances in S (or in mhos). • Note the polarity change. 1 Ω Difference circuits • Choose G g and ∆ G such that out 1 a1 2 a2 n an 1 b1 2 b2 m bm V (a V a V a V ) (b V b V b V ) = - + + + + + + + ⋯ ⋯ b1 b1 b2 b2 bm bm b1 b2 bm g G V G V G V V V G G G G +- + + + = = + + + + ⋯ ⋯ f out a1 a2 an f a1 a1 a2 a 2 an an b1 b1 a1 a2 an f b1 b2 b b2 b2 bm bm a1 a1 a 2 a 2 an an m g (G G G G G V V (G G G G G) ( G G V G V G V ) (G V G V G V ) (G V G V G V ) (G G G G ) )- + + + + + ∆ + + + = + + + + + ∆- + + + = + +- + + + + ⋯ ⋯ ⋯ ⋯ ⋯ ⋯ a1 a2 an f b1 b2 bm g G G G G G G G G G + + + + + ∆ = + + + + ⋯ ⋯ • Non-inverting terminal • Inverting terminal ?...
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lecture 32 - 1 Summary of Lecture#32 General-purpose...

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