Moin,
On Mon, 01 Jun 2015 11:00:31 -0400 Vlad <t...@patoka.org> wrote: > I am curious, how the integrated gates could be compared for those > created on discrete elements ? Let say simple gates like this: For the same implementation: Worse. There is much less control over the exact building of discrete devices than integrated ones. There hundreds of tiny things that are harder to control: * You have wires going over the PCB. These have a long length, thus a high inductivity, and high capacity. * They are on a substrate that is known to be quite hydrophile and thus has changing electrical parameters (dielectric constant, permeability, resistivity,...) * Everything is slower, due to higher capacitance/inductance/resistance of the wires inbetween. * Slower translates into less defined edges -> more jitter. * Higher capacitance translates into more current flowing at the same speed, which again translates into more shot-noise (though less therma noise) * Longer wires are more susceptible to EMI, or rather pick-up of tiny interferences from other circuits or even other parts of the same circuit. * Longer wires are also more prone to emit EMI. ... just to name a few. This list can be continued for quite some time. On the other hand: A well designed discrete circuit can beat a general purpose integrated circuit in almost all performance measures. > http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/trangate.html These are resistor-transistor-logic (RTL) elements. Those even more noisy due to their simple build up. Attila Kinali -- It is upon moral qualities that a society is ultimately founded. All the prosperity and technological sophistication in the world is of no use without that foundation. -- Miss Matheson, The Diamond Age, Neil Stephenson _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
