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'[EE:] Diode curve shapers'
2004\06\28@075338 by Russell McMahon

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Found myself with the need to build a diode curve shaper - a very time
honoured piece of circuitry but possibly an almost unknown beast amongst
those newer to electronics.

Decided to Google to see if there were any useful ideas and came on this
rather good overview.
Well worth reading by anyone who hasn't heard of the idea and who wishes to
expand their analogue electronic horizons, and by anyone interested in a
refresher course.


<www.electronics.dit.ie/staff/ypanarin/Lecture%20Notes/FT221-4/5%20Si
gnal%20Shaping.pdf>

The diode curve shaper is a low cost way of forcing a wave form
approximately to one's will using low cost components. While a superior
solution may be possible using more arcane technology, the result is often
surprisingly useful.

FYI - my application is to de-linearise an analog generated triangle wave to
give it faster rise times at lower amplitudes (more sine like but not
quite). It's being used to generate PWM from an input voltage and requires a
non linear transfer function. It's for a highish volume application and the
client would prefer a non processor based solution if reasonably possible.


       Russell McMahon

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2004\06\28@121451 by Harold Hallikainen

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This is interesting technology. The XR2206 uses it, I believe, to take an
internally generated triangle wave and shape it to a sine wave with
something like 0.5% THD. The XR2206 is a pretty neat chip in that it is a
function generator that will output a square wave (open collector),
triangle wave, or sine wave. You can generate linear FM with it by
injecting a current into one of the programming resistor pins. You can
generate Frequency Shift Keying by driving another pin with logic levels,
which switches between two frequency determining resistors. It also has an
analog multiplier (balanced modulator) so you can generate double sideband
suppressed carrier AM.

Harold

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2004\06\28@154204 by John N. Power

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> From:         Harold Hallikainen[SMTP:.....haroldKILLspamspam.....HALLIKAINEN.COM]
> Sent:         Monday, June 28, 2004 12:14 PM
> To:   EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU
> Subject:      Re: [EE:] Diode curve shapers

> This is interesting technology. The XR2206 uses it, I believe, to take an
> internally generated triangle wave and shape it to a sine wave with
> something like 0.5% THD.

That's right. The same method was used in its predecessor, Intersil's
ICL8038.

John Power

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2004\06\28@173935 by Russell McMahon

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A friend replied:

" ... the schematics/formulae in the 1st half are lifted
straight out of the definitive Burr-Brown book "Operational Amplifiers
Design and Applications" edited by Tobey, Graeme, and Huelsman and published
by McGraw-Hill.

I have had a copy of this book since I chose it as my 7th-form Physics prize
in 1974 (hey that's 30 years ago :-) :-(

I think I have probably used just about every circuit idea in it, and would
suggest that anyone doing analog circuit design using op-amps should have a
copy on their bookshelf."

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