Re: [time-nuts] LT1016 as a pulse shaper...

.nz> Date: 3/4/18 8:32 PM (GMT-05:00) To: Hal Murray <hmur...@megapathdsl.net>, Discussion of precise time and frequency measurement <time-nuts@febo.com> Subject: Re: [time-nuts] LT1016 as a pulse shaper... Since I have a Timepod all that I'd need would be a board that had SMA i

Re: [time-nuts] LT1016 as a pulse shaper...

Hi Having tried to do these measurements a lot of ways ….. the TimePod makes it *very* easy. The ability to get phase noise and ADEV “all at once” is part of it. The ability to handle a wide range of input levels with minimal degradation is a also part of the why. The software makes it easy

Re: [time-nuts] LT1016 as a pulse shaper...

Since I have a Timepod all that I'd need would be a board that had SMA inputs and outputs with provision for an LC L network to step up the input if necessary plus an RLC network on the output something like in the attachment. If one doesnt have a Timepod or equivalent a low noise phase

Re: [time-nuts] LT1016 as a pulse shaper...

Hi The “best” way to measure phase noise will always be a “that depends” sort of thing. One pretty darn good way to check noise on any amplifier is to use something like a TimePod. You use a power splitter and a pretty good source. First you check your TImePod (or whatever) for floor. You

Re: [time-nuts] LT1016 as a pulse shaper...

Bruce Griffiths said: > If I had a suitable PCB board for it I would do the measurement properly. What would a suitable board look like and/or what sort of gear do you need to measure PN? -- These are my opinions. I hate spam.

Re: [time-nuts] LT1016 as a pulse shaper...

That just confirms that they are clueless when it comes to accurately measuring additive PN. To get the real additive PN one would have to measure it for oneself. If I had a suitable PCB board for it I would do the measurement properly. Bruce > > On 04 March 2018 at 23:59 Leo Bodnar

Re: [time-nuts] LT1016 as a pulse shaper...

Not sure how calculated this - the PN chart for PL133-37 shows output jitter barely lifting off the input jitter trace. LT do not say what their input jitter is. Additive jitter for 100MHz 12kHz-20MHz is 80fs for PLL133-37 and 90fs for LTC6957 at more than 10 times lower price. I would trust

Re: [time-nuts] LT1016 as a pulse shaper...

Somewhat worse than an LTC6957 particularly at low offset frequencies. Either that or the manufacturers PN noise measurement method doesn't work well at low offsets. Bruce > > On 04 March 2018 at 22:34 Leo Bodnar wrote: > > Ulf, > > What level of jitter

Re: [time-nuts] LT1016 as a pulse shaper...

Ulf, What level of jitter would you consider acceptable? Try PL133-37, I am using it for sinewave shaping on some of designs - including my 30ps pulser. Leo On 3 Mar 2018, at 21:56, time-nuts-requ...@febo.com wrote: > From: Ulf Kylenfall > > Gentlemen, > I have so far

Re: [time-nuts] LT1016 as a pulse shaper...

The attached circuit is suitable for testing the PN of various CMOS inveters etc used as sine to CMOS converters. Just adjust the input LC network and resistors to suit the source, frequency, power and CMOS device Vcc. Select the resistor in series with the CMOS output to produce a total series

Re: [time-nuts] LT1016 as a pulse shaper...

nt <time-nuts@febo.com>, Ulf Kylenfall <ulf_...@yahoo.com> Subject: Re: [time-nuts] LT1016 as a pulse shaper... Hystersis (exhibited by 74xx14 devices) results in AM to PM conversion which increases as the amount of hysteresis increases. Bruce > > On 04 March 201

Re: [time-nuts] LT1016 as a pulse shaper...

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 > wrote: > > Ideally one should use a Collins style optimised cascade of

Re: [time-nuts] LT1016 as a pulse shaper...

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

Re: [time-nuts] LT1016 as a pulse shaper...

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

Re: [time-nuts] LT1016 as a pulse shaper...

In the 5071A, we squared up an 80 MHz clock with a 74AC04 gate capacitively coupled with resistive bias to set it at half the supply current; not a resistor from input to output as you often see. Ever since the LT1016 came out, it has been the "easy" way to square up a sine wave. Easy != high

Re: [time-nuts] LT1016 as a pulse shaper...

Search for ultra fast comparator yields TL3016 and AD8611, claims to be faster pin compatible replacements. I have found low parasitic capacitance on the outputs of these types of comparators is important, and I have used balanced hysteresis (use positive feedback from both + and - outputs). I

Re: [time-nuts] LT1016 as a pulse shaper...

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