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Filter Wizard

As well as being The Filter Wizard, Kendall Castor-Perry is a skilled circuit designer, product engineer and all-round analog expert. He's a widely published communicator of theory and method in many electronics disciplines. His fascination with electronics and audio dates back to boyhood. He spent 21 years designing filters, precision instrumentation, signal processing equipment and music systems. Then 11 years selling and designing in analog semiconductors. He's created advanced products to chase signals across many domains, extract the information from them and do something useful with it.
These days, Kendall is with Cypress, doing system architecture, product definition and strategic application analysis for their precision analog and mixed-signal devices. And also, of course, supporting customers with all sorts of analog and digital filter designs. He's also educating and mentoring a new generation in the ways of analog and systems thinking.  Striving to improve the world one dB at a time!


'Perfect' pseudo-differential input ADCs 

AC Voltage gain using just resistors and capacitors?

Turn linear phase into truly linear phase  

How linear phase filters can still cause phase distortion

More direct waveform synthesis: Mr Chebychev helps out

Direct waveform synthesis using filter-like techniques

Now fix those drooping DAC and ADC responses 

Why are my DAC and ADC responses drooping?

Now synthesize your FIR filters using high-school algebra

Analyze FIR filters using high-school algebra


Prediction and negative-delay filters: Five things you should know


Five things you should know about RMS

Sample multiple channels 'simultaneously' with a single ADC

Which filters are noisier – analog or digital? part 2

Which filters are noisier - analog or digital? part 1

Active filters that still work even when their amplifiers do not

A fast-settling bias voltage filter with high ripple rejection

Filter DC voltages outside your supply rails

Lowpass filters that don't: A tale of leakage current

Gee, I see! The ins and outs of generalized impedance converters'

An Appendix to Filter Wizard 14 (Match Point)

Bruton Charisma: Make those inductors vanish using savvy scaling

Dualling Master: Swap Current and Voltage for Easier Filter Design

Match Point: Why maximum power means minimum sensitivity

Buenos Notches - The Filter Wizard versus the vuvuzela

Filter Design using the Million Monkeys Method

Simulate circuits in a spreadsheet with some 'ladderal thinking' 

Excel tunes up your schematic files

Fainting in Coils

Countdown to S-to-Z

An Excelent fit, Sir!

One giant squeak for Mankind – Revisits an audio circuit project from 'Practical Electronics'magazine, May 1969.

Use it or slew it – Provides advice on how to determine the slew rate needed from an opamp.

An E96 formula: how can you resist it? – Kendall discusses the value of spreadsheets when calculating component values.

Ping! And the accuracy is gone – Where exactly does the ringing come from when you sample the input voltage of a high-speed ADC?

Alias, damned alias and statistics – Does 'aliasing' need fixing, asks our filter wizard, and does fixing it cause problems elsewhere?

Who, what and why? – Analog DesignLine Europe's expert columnist introduces himself.

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Technical papers     

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This month Ambiq Micro is giving away five of its 'Apollo EVB' evaluation boards, worth 9 each for EETimes Europe’s readers to assess the capabilities of their cutting-edge Apollo sub-threshold microcontroller.

The new suite of Apollo MCUs is based on the 32-bit ARM Cortex-M4 floating point microcontroller and redefines 'low power' with energy consumption that is typically five to...


Design centers     

Infotainment Making HDTV in the car reliable and secure

December 15, 2011 | Texas instruments | 222901974

Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.


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