[sdiy] Logic Gate help (Help!)

blacet at blacet.com blacet at blacet.com
Wed Jan 23 18:55:25 CET 2013


Why not just use CMOS IC gates?

> Hello,
>
> I'm looking to build a 2x input OR Gate and a 3x input XOR Gate using
> Resistor/(NPN)Transistor Logic.
>
> I have this schem of a 3x Input NOR:
> http://en.wikipedia.org/wiki/File:RTL_3-Input_NOR_Gate.svg
>
> 1) From that schem, if I remove 1x Input and either Invert the output or
> take the Q Output from the joined Emitters - does that give me a 2x Input
> OR?
>
> 2) Is a 3x Input NOR the same as an XNOR? i.e. If I invert the output of
> that schem I get a 3x Input XOR from that XNOR? The truth tables suggests
> not - but I'm asking anyway.
>
> If not! Anyone got any pointers to a 2x In OR and a 3x In XOR using RTL?
>
> Thanks.
>
> Justin
>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at synth-diy.org
> http://synth-diy.org/mailman/listinfo/synth-diy
>




More information about the Synth-diy mailing list