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The Filter Wizard Remastered

Who, what and why?

Kendall Castor-Perry
markgrogan
markgrogan
4/3/2019 12:11:16 AM
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Newbie
Experts of the field
It is great to have someone with immense expertise in the field to be sharing secrets regarding the industry. It takes an expert to know what are the dos and don'ts that we all need to practice and avoid. Without trade secrets from professionals in the field, we can never learn to know what to expect in the future ahead.

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kendallcp
kendallcp
2/25/2019 4:18:52 PM
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Artist
Re: Welcome back Kendall
Thanks Steve - great to be back on the planet's #1 Analog forum!  Looking forward to re-releasing almost 40 Filter Wizard pieces on one handy forum.  Whether you read them ten years back or are new to the material, I hope you all enjoy it.  And with luck we'll find a way of getting your questions and comments back to me.

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steve.taranovich
steve.taranovich
2/25/2019 3:50:46 PM
User Rank
Blogger
Welcome back Kendall
I am thrilled to have my friend and long-time colleague, Kendall, back with my Planet Analog family. I know you will all enjoy his witty, technical and educational repertoire of Filter knowledge and wizardry in the coming weeks.

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More Blogs from The Filter Wizard Remastered
There’s a further cool thing you can do with a spreadsheet that most SPICEs can’t. That’s to use the spreadsheet ‘solver’ functionality to adjust component values in the search for a better-fitting circuit – or even to find a set of component values for a circuit you can’t otherwise design.
You now need to adjust component values to achieve some system goal, such as predefined frequency response or time behaviour, and there’s no closed method for working out those values.
In previous posts I’ve talked about transferring spreadsheet-based circuit design “directly” to the lovely LTspice simulator, and a reader of The Filter Wizard was keen to understand exactly what “directly” actually meant, and to get some practical information on how to do it.
The required selectivity of a customer design implied four-pole filters with about 10% bandwidth (passband width about 10% of the centre frequency). There was a catch---a tight power budget
Now, our customer doesn’t want to buy big, expensive, high quality capacitors to build an active filter with this response. So, having established the principle of optimizing in the analogue domain, let’s look at whether need to make any changes in order to use it to create a digital filter – which we’ll be able to implement on the Cypress PSoC 3
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