For the bandpass, we’ll need to build up a quick highpass filter as well. Bonus! I claimed last time that the Sallen-Key lowpass would cover something like 80% of your filtering needs.

Next up will be three more examples of the Sallen-Key filter: a highpass design just swaps the resistors and capacitors, and a very useful bandpass filter can be made by cascading a highpass with ...

Applications such as audio equalizers require bandpass filters with a constant maximum gain that's independent of the filter's quality factor, Q. However, all of the well-known filter ...

I was concocting a rather silly low-pass filter design, when I remembered that Messrs Sallen and Key did it better in the 1950s, and decided to use their two-pole design to implement a Butterworth ...

A scheme of simple band-pass ... filter of Robert Allen Pease and its modified LR- variant. Wow the engineering world with your unique design: Design Ideas Submission Guide From the whole set of ...

Recently, people in various publications have been pointing out that using an ordinary op amp in a Sallen-Key filter can cause problems. A typical op-amp circuit, as shown in Figure 1, can have a ...

require bandpass filters with a constant maximum gain, independent of the selected quality factor Q. But in a lot of well-known filter structures—such as Sallen-Key, MFB, state variable ...