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filters: can someone explain the circuit?

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kasakachda

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Hello there.
The circuit in the pic is used in receiving stage of an RFID reader. All I know is that the first two filters are active twin-t filters and the third one is a butterworth low pass filter.

Can someone confirm this. Also I need the design procedure for the same. Please help... :)
 

crutschow

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Analysis of such circuits is not trivial. Doing it by hand is a real exercise in mathematical agility. The easiest way to determine the filters' characteristics is to simulate it with a SPICE program. Such programs are available for free from Linear Tech and TI.

Design of such active filters is easiest with a design program. Free programs from TI Active Filter Design Application - FILTERPRO - TI Software Folder or National Semi http://webench.national.com/appinfo/webench/filters/design_requirements.cgiallows generate the design for various filter types and configurations.

If you need any further info on active filter types just Google "Active Filters".
 

crutschow

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