Fixed Frequency Filter - Low/high/band pass, 4th-8th order Butterworth, Chebychev or Bessel response

This module includes 4 single amplifier blocks which could be configured to provide up to 4 bi-quadratic, low-pass or high-pass, filter stages. Each stage is realised in Sallen and Key circuit configuration. The 1st block is preceeded by a passive R-C stage which can be used as a 1st order 'roofing' filter to prevent high frequency components from entering the op-amp. Additionally, the passive RC stage could be used to make the overall filter an odd order. Stages not being used for filtering can be used as buffers/gain stages. This module can now be purchased in a 2x4th order package, which allows the user to implement 2 completely seperate 4th order filters or a single 8th order filter on the one module. The module can also be purchased ready built to the customers own specification.




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