Other Lowpass and Highpass Filters
In Chapters 8 and 9 we saw the stunning versatility of the Sallen & Key configuration for making lowpass and highpass filters, but while it is probably the most useful and popular active filter it is by no means the only type out there. The multiple-feedback or MFB filter configuration is very likely the second best known; it has some potential advantages, but there is an inherent and inconvenient phase inversion. Other filters require more than one amplifier but in return give lower sensitivity to component tolerances or to varying opamp open-loop gain, or give convenient adjustment such as independent control of cutoff frequency and Q. Biquad is a term often used in filter design, ...
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