[sdiy] Matched transistors - critical parameters?

[Paul Perry]

And maybe this is why multiple OTA filters sound so different from each 
other.. my workshop is in storage, but maybe someone can take a few 
measurements. I think that transconductance is not guaranteed to be better 
than 50% in agreement.

----- Original Message ----- 
From: "David G Dixon"
> In my experience, with multistage filters, if you are sending the same
> current to the Iabc inputs of OTAs, you don't even need to mirror the
> current -- just connect all of Iabc's directly to the current source. 
> Each
> one should suck the same amount of current.

paul perry Melbourne Australia