[sdiy] LTSpice problem: simulating Irwin/Gallo linearised 2164 VCA

Phil Macphail phil.macphail at liivatera.com
Thu Aug 22 17:40:53 CEST 2019


And if it does oscillate, SPICE will fail to find a DC initial condition, because the steady-state keeps moving,


Phil

Sent from my iPhone

> On 22 Aug 2019, at 18:28, Neil Johnson <neil.johnson71 at gmail.com> wrote:
> 
> Tom,
> 
>> Thanks Richie. I hadn’t bothered modelling the 560p/500R networks that the 2164 demands in reality, but perhaps adding those will help here. I’ll give it a try and see what happens.
> 
> It depends on your 2164 model.  If it's just a basic behavioural model
> then you don't need it, but if it's any where near a full or semi-full
> discrete transistor model then you do need those compensation parts or
> the 2164 will oscillate into the 100's of kHz!
> 
> Neil
> 
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