[sdiy] Tanh (was Re: LTSpice macromodell help)

[Tom Wiltshire]

Aah, "tanh", the function for all seasons...

I came across this the other day:

	http://www.m-audio.com/products/en_us/Venom.html

The marketing blurb says:

	"resonant multimode filter with tube saturation limiting"

No prizes for guessing what function they put between the filter stages in that DSP model, or whose paper they've been reading to get the ideas for nonlinear digital filter implementation, eh Antti?

T.



On 13 Apr 2011, at 18:23, Harry Bissell wrote:

> It does handle behavioral expressions. Thanks Phil, that will do it !
> 
> H^) harry
> 
> 
> ----- Original Message -----
> From: Phil Macphail <phil.macphail at liivatera.com>
> To: Harry Bissell <harrybissell at wowway.com>
> Cc: synthdiy <synth-diy at dropmix.xs4all.nl>
> Sent: Wed, 13 Apr 2011 12:02:14 -0400 (EDT)
> Subject: Re: [sdiy] LTSpice macromodell help
> 
> If LTspice can handle behavioral expressions, then tanh will give you the limiting function you require. I don't know this flavour of Spice, but it is my preferred method of building ideal components that converge well and don't wander to silly node voltages,
> 
> Phil
> 
> On 13 Apr 2011, at 16:47, Harry Bissell <harrybissell at wowway.com> wrote:
> 
>> Hi all... yes its synth-related
>> 
>> I'm trying to come up with a macromodel of a voltage limiter circuit. Electronic Workbench includes
>> such a device, LTspice does not.
>> 
>> The object would be to limit input voltages to a range between Vpos and Vneg that I would set. Using
>> a series resistor, two diodes, and two voltage sources is a crude way to do it. I'm looking for something
>> much more elegant.
>> 
>> Any takers ???
>> 
>> H^) harry
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> 
> -- 
> Harry Bissell & Nora Abdullah 4eva
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