29-01-2013, 02:30 PM
Electric circuits
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The Biquad filter
The biquad configuration is a useful circuit for producing bandpass and low-pass
responses, which require high Q-factor values not achievable with the VSVS and
the IGMF circuits. The Biquad and the state variable filter circuit configuration
can have Q-factor values of 400 or greater. This circuit, whilst not as useful as the
state variable, nevertheless has certain applications. It is easily tuneable using
single resistor tuning (normally a stereo or ganged potentiometer). It can be
configured to produce a Butterworth or a Chebychev response by changing the
damping (1/Q).