Hystersis (exhibited by 74xx14 devices) results in AM to PM conversion which increases as the amount of hysteresis increases.
Bruce > > On 04 March 2018 at 10:34 Bruce Griffiths <[email protected]> > 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" > > <[email protected]> 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:[email protected]] 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 -- [email protected] To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
