Chapter 8
Designing Lowpass Filters
Sallen & Key
Designing Real Filters
In Chapter 7 we saw how just about any filter you can dream up can be implemented by cascading 1st- and 2nd-order filter blocks. In this chapter we look at the best ways to turn those theoretical blocks into reality. There are many ways to do this, but for the moderate Q values normally required, one of the simplest and the best methods is the well-known Sallen & Key configuration. This chapter and Chapter 9 on highpass filters focus entirely on various versions of the Sallen & Key filter. Other configurations, such as the multiple-feedback filter (MFB), are described in Chapter 10. To accurately implement high Q’s, more complicated multi-amplifier configurations such as ...
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