[sdiy] Any noise avantage to parallel 2164 VCAs?

Neil Johnson neil.johnson71 at gmail.com
Sun Jun 17 23:58:22 CEST 2018


Schwarz Raphael wrote:
> " I think it’s more accurate to think of the 2164 gain cells as a voltage controlled resistor rather than an opamp stage "

Yeah, umm, that's just wrong, don't go there.  Otherwise....

> Thank you ! Now I understand why there is no resistor between the 2164 cell and the following op-amp. The 2164 cell is acting as the input resistor, the gain itself is in fact the work of the op-amp.

No it is not.  For example, how does your model account for when the
2164 exhibits gain (for negative control voltage)?  Do you really want
to think about negative resistance, or would you rather learn the
correct circuit model?


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