50 ohm termination

I have one product with three chips, nine gates, in parallel. But each package has its own output resistor, so they sorta share nicely.

Seems to work. Maybe parts on the same reel match pretty well.

I'd love to have a chip that was specifically a brutal fast driver.

What scope is that? The gate may be a tad faster.

Splitting the 50r source terminator into 100's has virtues.

Am 30.03.25 um 04:19 schrieb john larkin:

Agilent 54846B 2.4 GHz, tr = 156 ps <

I use the fast tr=9ps sampler only when really needed. It would be an invitation to disaster :-)

Thanks. We do similar things, but only with single packages--we often drive fast (500 ps to 5 ns) LEDs with 74AHC04s or 74LVC04s in QFN. (QFNs are dramatically faster for this than TSSOPs or SOICs, on account of the much lower package inductance in the power and ground.)

For that job, the trick is to parallel four sections with one resistor at the output, and drive them with the other two sections in cascade, to get a bunch of voltage gain. That sharpens up slow input edges very nicely. (In bad cases, one might want a 1G14 Schmitt in there as well.)

Cheers

Phil Hobbs