Re: Transistors

"John Larkin" <jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:fgr0k3tgbk8acns2uu1ub71uk1v1tv6vgv@xxxxxxxxxx
I once designed a rack full of 16 bit DACs, for a military system.
Each DAC board used an R-2R ladder made from hand-selected wirewound
resistors, and the switches were all inverted-saturating PNP/NPN
pairs, collectors riding on +-10 reference rails. The base currents of
the first few bit switches were trimmed for zero saturation offset.

What's the advantage over using a two-diode gate? Okay, a *matched pair*
two-diode gate...

I would suppose those dual diode SOT23 bits would work well for that.

Tim

--
Deep Fryer: A very philosophical monk.
Website @ http://webpages.charter.net/dawill/tmoranwms


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