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From: "Don" <g@crcomp.net>
Newsgroups: sci.electronics.design
Subject: Re: Transfer function reduction math
Date: Tue, 11 Jun 2024 19:44:32 -0000 (UTC)
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bitrex wrote:

<snip>

> Seems like they're doing some kind of tanh interpolation but it's not
> entirely obvious to me how they get from equation (3) to the expression
> in (5).

Unless the fuzzy form of your scan deceives my eyes, it appears the
numerator and denominator are multiplied by the conjugate to obtain
(4) from (3).

A clearer scan may enable me to continue.

Danke,

-- 
Don, KB7RPU, https://www.qsl.net/kb7rpu
There was a young lady named Bright Whose speed was far faster than light;
She set out one day In a relative way And returned on the previous night.