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Home > Cypress Developer Community > Blogs > The Filter Wizard Blog


The Filter Wizard Blog
Nov 14, 2012

Two pieces out on the same day for you!  Firstly the promised Filter Wizard on getting AC voltage gain out of just resistors and capacitors.  Just a nichy little bit of network theory, but still a bit of fun as the winter draws in: http://www.analog-eetimes.com/en/ac-voltage-gain-using-just-resistors-and-capacitors.html?cmp_id=71&news_id=222904234.  And then the third part of the Class i amplifier series on EDN, for all you audio fans out there:  http://www.edn.com/design/consumer/4401234/The-Class-i-low-distortion-audio-output-stage--Part-3-.  Always happy to hear from you with suggestions for topics that I should cover in future articles.  Thinking of doing a regular active filter article next, with a little program for calculating component values for the Friend single-amplifier filter in lowpass notch and highpass notch forms, using preferred values but still getting good response accuracy.  Interesting?  Let me know.

 

 

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Oct 19, 2012

Hello, Wizarders!  sorry that I haven't posted anything in a while.  Lots of other stuff going on.  If any of you are getting withdrawal symptoms for circuits and equations, though, why not check out EDN (http://www.edn.com/design/consumer/4398669/The-Class-i-low-distortion-audio-output-stage--Part-2- is part 2, which links back to part 1) for the first two parts of my four-parter on an audio power output stage I started designing a long time ago - before Cypress was founded, so that's when real dinosaurs still walked the Earth!  The last two parts will be along during the next month or so.

When I finally get round to building one of these again, I'm sure that PSoC will be a fantastic supervisory controller, with its flexible analog and programmable digital hardware.  This will allow the monitoring and calculation of temperatures, power dissipation levels, overload and operating points, built-in timers, power quality analysis, earth loop impedance measurement... so many useful things a great audio power amp might need.  If any of you out there are doing or have done any power amplifier supervisory stuff, check out PSoC3, and ping me if you have any questions.

After I've got over the shock of the beginning of the new quarter, my next published Filter Wizard article will likely be on circuits that generate voltage gain using only pure lumped resistors and capacitors.  Useful?  Don't know, but certainly unexpected!  best / Kendall

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Sep 17, 2012

For all of you who have been waiting patiently for the how-to-fix-it following the last Filter Wizard on linear phase not actually being phase response that fits onto a single straight line... here's how to fix it!  Well, a few ways, anyway. http://www.analog-eetimes.com/en/turn-linear-phase-into-truly-linear-phase.html?cmp_id=71&news_id=222903957.  Enjoy!

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Sep 03, 2012

Here's something that passes most filter users by - the flipping of stopband phase in a FIR filter.  The first part of a two-parter Filter Wizard is now up on EETEu, go check it out!  http://www.analog-eetimes.com/en/how-linear-phase-filters-can-still-cause-phase-distortion.html?cmp_id=71&news_id=222903874.  A good demonstration of using PSoC Creator's Filter customizer as a tool to probe what goes on with your filters.  best / Kendall

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Aug 23, 2012

Hello, consumers of my blog!  I just signed up for an RSS-to-email feed service (http://www.feedmyinbox.com) so that I can check out my daughter's science blog (http://sciencesponge.wordpress.com).  And it made me wonder, how many of you out there actually use an RSS feed reader to view my blog, and how many just use wa web browser?  Let me know!  best / Kendall

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