Does someone know a digital gates (inverter, buffer, nand, and, or, nor, etc...) that can go from 0V to 5V in about 1ns?
I have check TTL, but they are not so fast.
Ideally, I should found it in Farnell, Digikey, Mouser, etc...
Alain.
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\$\begingroup\$ You should check out these questions: 1, 2 and finally 3. I got them from here while also doing a ctrl+f for "closed". \$\endgroup\$– Harry SvenssonNov 8, 2017 at 21:59
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3\$\begingroup\$ why do you want a gate that fast? \$\endgroup\$– BeB00Nov 8, 2017 at 22:00
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1\$\begingroup\$ If you just want a fast rise time pulse e.g. to characterize an oscilloscope, there are other ways to generate one. \$\endgroup\$– pericynthionNov 8, 2017 at 22:07
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1\$\begingroup\$ @pericynthion No idea whether this would help the OP, but what would you suggest to generate a fast rise time pulse? \$\endgroup\$– user2233709Nov 8, 2017 at 22:22
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\$\begingroup\$ @user2233709 Jim Williams has a famous design - Appendix D of this app note and google "avalanche pulse generator" for various related designs, both DIY and low-cost off-the-shelf. \$\endgroup\$– pericynthionNov 8, 2017 at 22:27
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2 Answers
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Emitter coupled logic is that you want, like the https://www.digikey.co.uk/product-detail/en/MC10EP08DTG/MC10EP08DTGOS-ND/920778?curr=gbp&WT.z_cid=ref_octopart_dkc_buynow&site=us
Why do you need it to go that fast?
If you want your circuit to actually go at GHz speeds, you'll need to take a lot of things into account other than just the chip.
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3\$\begingroup\$ ...things like controlled impedance PCB layout and line termination; and these ECL systems are power-hungry. Bear in mind the speed of light is about 1ns per 20-30cm, so in that realm cables and pcb traces are no longer just ideal wires, they are transmission lines and delay lines. \$\endgroup\$– MarkUNov 8, 2017 at 22:15
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\$\begingroup\$ OP asked for a pulse going from 0 to 5 V. ECL levels are classically from about -2 to -1 V, or +3 to +4 V if using them as "PECL". (Levels are very rough, but in any case the difference between low and high is ~800-1000 mV, not 5 V) \$\endgroup\$ Nov 8, 2017 at 23:45
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\$\begingroup\$ Hello, thank you for your first response. I need such speed in order to generate a very fast dV/dt (>1500V/us). The target is to make some characterize some device in extreme condition. \$\endgroup\$– ABUNov 9, 2017 at 21:56
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\$\begingroup\$ Hello again! Yes I know that for such speed, I should be very strict in the design. \$\endgroup\$– ABUNov 9, 2017 at 21:59
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\$\begingroup\$ @ThePhoton is correct that the vdiff is only 800mV, but it looks like that may work in your design, because it can switch in 130ps, giving a rise time of 6000V/us \$\endgroup\$– BeB00Nov 9, 2017 at 22:03
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Potato Semiconductor (yes, really) has some 74-family parts with sub-nanosecond rise/fall times.
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\$\begingroup\$ "It looks like your pulse was generated on a potato" \$\endgroup\$ Nov 8, 2017 at 22:29