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2. Basic functional circuits for active filters
Resistors, capacitors, operational or transconductance amplifiers are combined to create active filters. The basic building blocks are presented below.
2.1 Active circuits
These are almost exclusively conventional operational amplifiers or transconductance amplifiers. The usual transfer function notations are used, with the Laplace variable p=jw or the pulsation w=2pf depending on the case.
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Basic functional circuits for active filters
Methods for synthesizing filters from their transfer function
Bibliography
References
Software
The calculation of an active filter is divided into two distinct parts:
transfer function calculation ;
calculation of the numerical values of the elements included in the production diagram.
Filter transfer functions can be calculated using general mathematical software such as MATLAB, Mathematica or Mathcad,...
Manufacturers, constructors
Analog Device http://www.analog.com/
Burr Brown (see Texas Instrument)
Linear Technology http://www.linear.com/
Maxim http://www.maxim-ic.com/
...
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