BesserBits interactive

If you like the topics, check out our related courses!

Visit www.bessercourse.com for more information!

High-Pass Butterworth Filter Design

In this article we will describe the design of a simple high-pass Butterworth filter using normalized prototype circuits. The procedure for designing a filter based on a normalized prototype is quite simple.

• First, transform the highpass parameters into lowpass parameters.
• Next, you determine the order of filter that will be needed to fulfill your design requirements, as was done with the lowpass design.
• Then, tables or formulas list the element values that will produce a lowpass filter of that order with a cutoff frequency of 1 radian/second, with source and load terminations of 1 Ohm connected to it. These are the normalized prototype values
• Replace each element in the prototype lowpass filter design with its dual element to create a normalized highpass filter design.
• Formulas are used to scale those values to the actual source and load impedances and to the actual design cutoff frequency.