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AN: StateVariableFilter(P+1) Updated

Based on a question to the LTspice List by John Woodgate I have posted updated information regarding adding zeroes to a state variable filter at...

...Jim Thompson

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

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| 1962 | I love to cook with wine. Sometimes I even put it in the food.

Reply to
Jim Thompson
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Interesting Thanks Jim. I've always used three opamps to make a SV filter. And I recall adding a pole (Band reject filter) with the fourth opamp by subtracting the BP response from the input.. (Oor something like that.) I thought it was in the app notes for the UAF42...

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oops here it says I sum LP and HP outputs

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page 5 equation 4.

(Amazing that they are still making the UAF42.)

George H.

Reply to
George Herold

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