LMV321-N, LMV321-N-Q1, LMV358-N, LMV358-N-Q1
LMV324-N, LMV324-N-Q1
SNOS012I –AUGUST 2000–REVISED FEBRUARY 2013
www.ti.com
Figure 62. Sallen-Key 2nd-Order Active High-Pass Filter
State Variable Filter
A state variable filter requires three op amps. One convenient way to build state variable filters is with a quad op
amp, such as the LMV324 (Figure 63).
This circuit can simultaneously represent a low-pass filter, high-pass filter, and bandpass filter at three different
outputs. The equations for these functions are listed below. It is also called "Bi-Quad" active filter as it can
produce a transfer function which is quadratic in both numerator and denominator.
Figure 63. State Variable Active Filter
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