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COMBINATION_FILTER

2017-02-14 14:48  
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COMBINATION_FILTER
The classic state variable two-integrator filter is known for its insensitivity to component varia-tions, and its ability to provide three separate simultaneous outputs-low pass, high pass, and bandpass.Typically, a quad op amp is used to implement the state-variable filter. The classic configuration uses two integrating amplifiers, a filter input amplifier, and a filter feedback amplifier.The design described here combines both input and feedback amplifiers into one adder/subtrac-tor amplifier, achieving a three op-amp filter design (see the figure).