Active filter

An active filter is a type of analog electronic filter, distinguished by the use of one or more active component i.e. one which provides some form of power amplification. Typically this will be a vacuum tube, transistor or operational amplifier.

Active filter circuit configurations include:

• Sallen and Key, and VCVS filters
• State variable, and biquadratic filters

See Also

• Chebyshev filter
• Butterworth filter
• Bessel filter
• Elliptic Filter

External links

• Split-Supply Analog Filter Expert
• Single-Supply Analog Filter Expert
• Introduction to active filters
• National Semiconductor's AN-779 application note