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Filter Wizard | Cypress Semiconductor

Filter Wizard

Summary: 2 Replies, Latest post by danaaknight on 29 Aug 2012 05:26 PM PDT
Verified Answers: 0
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user_14586677's picture
7646 posts

The nomenclature on plots is confusing.


"Nominal" should be changed to "desired" or "ideal"


"Expected" should be changed to "PSOC actual" or "PSOC result".


Regards, Dana.

seg's picture
Cypress Employee
28 posts


The vocabulary is a problem.

"Ideal" is in the eye of the beholder. I'll still think "nominal" is the most accurate description. 

"Expected" is what you expect to get using the available capacitor ratios. Note that the attenuation on the high frequency side is not quite down to the "nominal" level. "PSoC actual" is a better choice, as long as the user accepts that there may be some small variation from the curve. I'll change it in the next release.

---- Dennis

user_14586677's picture
7646 posts

"ideal" is a direct result of defining transfer function, its pole/zero locations, etc.. When one

speaks of Butterworth, Cheby, Elliptiec there is generally speaking a universal understanding

of what will result, response curves, impulse response, phase, etc.. of the ideal components.


So I think the "eye of the beholder" analogy should not apply to a textbook response

of ideal components, which pretty much is all the available software filter design tools

basis. Spice excepted of course, where one can model the non ideal behaviour of

components, escpecially caps.


Regards, Dana.

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