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The Filter Wizard Remastered
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Gee, I see! The Ins and Outs of Generalized Impedance Converters
The Filter Wizard Remastered  
7/8/2019   Post a comment
Well, it turns out that we can perform impedance scaling on actual components; let’s look at how we deploy key properties of the humble op-amp to do this.
An Appendix to Filter Wizard #14 ("Match Point")
The Filter Wizard Remastered  
7/1/2019   1 comment
Designing a filter using a spreadsheet. No sophisticated charts, no pole zero relationships, determination of a response type, none of those overly complex equations I learned in school.
Bruton Charisma: Make Those Inductors Vanish Using Savvy Scaling
The Filter Wizard Remastered  
6/27/2019   Post a comment
We set out to eliminate the inductors in our LC lowpass filter – and ended up doubling the number of them! We’ll see shortly just how these can be made to disappear in one mathematical stroke
Dualling Master: Swap Current and Voltage for Easier Filter Design
The Filter Wizard Remastered  
6/14/2019   Post a comment
Using optimization to design circuits (some might call it organized guesswork – for some algorithms, that’s a pretty good description) isn’t a new insight.
Match Point: Why Maximum Power means Minimum Sensitivity
The Filter Wizard Remastered  
6/7/2019   2 comments
Why did I want to set my source and load resistances to the same value?
Buenos Notches! The Filter Wizard versus the vuvuzela
The Filter Wizard Remastered  
5/24/2019   Post a comment
Removing the vuvuzela narrow-band noise was presenting challenges to broadcast engineers
Filter Design using the "Million Monkeys Method"
The Filter Wizard Remastered  
5/18/2019   Post a comment
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.
Simulate Circuits in a Spreadsheet with some 'Ladderal Thinking'
The Filter Wizard Remastered  
5/18/2019   1 comment
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.
Excel Tunes Up your Schematic Files
The Filter Wizard Remastered  
5/9/2019   2 comments
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.
Fainting in Coils
The Filter Wizard Remastered  
4/18/2019   Post a comment
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
Countdown to s-to-z...
The Filter Wizard Remastered  
4/12/2019   Post a comment
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
An Excelent fit, Sir!
The Filter Wizard Remastered  
4/12/2019   Post a comment
This is the first of two columns showing a simple technique for designing, optimizing and implementing a response-equalizing filter. The second part will look at implementing it on a device such as PSoC3; this part is about the design process.
One giant squeak for Mankind
The Filter Wizard Remastered  
4/3/2019   4 comments
Anniversaries, eh? Today, easy access to historical information on the web makes every date significant for some reason. The first Moon landing occurred on July 20, 1969
Use it or Slew it
The Filter Wizard Remastered  
3/25/2019   2 comments
How were you taught to determine the slew rate needed from an opamp?
An E96 formula: How Can You Resist It?
The Filter Wizard Remastered  
3/16/2019   3 comments
These days, I often code design equations for filter circuits directly into sequences of Excel cells
Ping! And the accuracy is gone
The Filter Wizard Remastered  
3/9/2019   1 comment
In some articles on driving sampling ADCs, you see the settling behaviour at the inputs being tweaked with resistors and capacitors. It’s good to see the subject raised, but the treatment always seems rather empirical to me, and doesn’t explain where all the ringing you see comes from.
Alias, damned alias and statistics
The Filter Wizard Remastered  
2/26/2019   1 comment
Every so often someone publishes an article discussing aliasing. I thought I’d jump on the bandwagon – you know, that one in the movies whose wheels seem to be rotating the wrong way. Is aliasing a problem?
Who, what and why?
The Filter Wizard Remastered  
2/25/2019   3 comments
Welcome to Filter Wizard Remastered – Kendall’s world of signals and circuit stuff! There’s lots to talk about across many different domains and disciplines, and also the chance to lighten up your daily grind a little.

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