Lowpass & Highpass Filter Characteristics
Douglas Self · 2012
Here, however, I am going to avoid the complexities of pole and zero placement etc., and concentrate on practical filter designs that can be adapted for use at different frequencies by a simple process of scaling component values. Most filter textbooks give complicated equations for calculating the amplitude and phase response at any desired frequency. This gets very cumbersome if you are dealing with a lot of different filters. I have assumed access to a SPICE simulator, which gives all the information you could possibly want, much more quickly and efficiently than wrestling with calculations manually or in a spreadsheet. Free simulator packages can be downloaded.