[sdiy] Problems with linearized SSI2164 ?

Danjel van Tijn danjel at intellijel.com
Thu Feb 7 19:11:03 CET 2019


I swapped the 22p for 100p and problems seemed to go away!

I guess the v2164 was less sensitive to HF oscillations (or at least we
were able to get away with 22p) but it is critical to have a larger cap
with the ssi2164.




On Thu, Feb 7, 2019 at 2:01 AM Neil Johnson <neil.johnson71 at gmail.com>
wrote:

> Hi Danjel,
>
> > Here is a link to the schematic block: https://ibb.co/njhCcbZ
>
> Thanks!
> One glaring difference between the Irwin/Gallo circuit and your
> implementation is that they both use 100p loop compensation whereas
> you use only 22p.
> The 30k input resistor should not cause a problem with the SSI2164,
> but the loop may not be stable so you need to check for HF oscillation
> with a decent scope or a spectrum analyser.
>
> Neil
> --
> http://www.njohnson.co.uk
>
-- 
cheers,

Danjel van Tijn
Intellijel Designs Inc.
m. +001 604-773-2426 <(604)%20773-2426>

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