Hi If you are simply dealing with 10 MHz sine waves (as many of us are).
— and — It’s a “matched” application ( = you know the level / the source and converter are tied together) — and — You don’t mind an L network to match increase the Vpp when it goes to the gate — and — Once the performance of the circuit is better than any source you can drive it with, you don’t care. ( = you only care if it degrades the signal) You can do a very good job with a biased CMOS gate. Running at 5V (or even better 5.5) will out perform 3.3V. They are dirt cheap. They are easy to solder down in SOT-23 packages. They are reasonably robust in terms of overload. They perform pretty well when under driven by modest amounts. They have nice short delay paths. What’s not to like :) Bob > On Mar 3, 2018, at 4:34 PM, Bruce Griffiths <bruce.griffi...@xtra.co.nz> > wrote: > > Ideally one should use a Collins style optimised cascade of increasing > bandwidth and gain limiting stages. The LTC6957 with its selectable input > stage bandwidth has a performance that is comparable with the Holzworth sine > to CMOS "amplifier" which is better than any comparator by itself. If the > amplitude of the input signal is large enough (i.e. input slew rate seen by > the gate is large enough) the performance of a single CMOS gate can be very > good. However the performance of current CMOS gates degrades in this > application with input frequencies of 100MHz and above. > > Measuring the PN performance of CMOS gates used as sine to CMOS converters is > on the todo list. > > Bruce > >> >> On 04 March 2018 at 06:38 "David C. Partridge" >> <david.partri...@perdrix.co.uk> wrote: >> >> You might consider using MC74VHC1GT14 or MC74VHC1G14 (Schmitt trigger >> inverting buffers) depending on the exact voltage levels. >> >> They are fast (74AC logic fast) single gate devices in SC70 (SOT-353) or >> SOT23-5 case and can drive 25mA output if needed. >> >> I've seen documents saying that using fast logic gates can result in >> lower jitter/phase noise. Bruce - do you know ? >> >> David >> >> -----Original Message----- >> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Ulf >> Kylenfall via time-nuts >> Sent: 03 March 2018 17:08 >> To: Discussion of Precise Time and Frequency Measurement >> Subject: [time-nuts] LT1016 as a pulse shaper... >> >> Gentlemen, >> I have so far been using LT1016 as a pulse shaper and also whenever I >> needed toconvert a sine wave into TTL Logic levels. Some hysteresis and all >> the decouplingand layout precautions as recommended by LT. >> Are there any similar or better alternatives out there that could be >> usedthat would provide lower jitter and that are less expenceive? >> Ulf Kylenfall >> SM6GXV >> >> _______________________________________________ >> 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. >> >> _______________________________________________ >> 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. >> > _______________________________________________ > 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. _______________________________________________ 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.
