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 LT more but all this is still armchair engineering. The only way to know is stick it on the board and check. Note that PLL133-37 is AC coupled internally so not suitable for short sharp spikes or low frequencies. Cheers Leo On 4 Mar 2018, at 10:20, Bruce Griffiths wrote: > 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 <leo@leobodnar.com> wrote: > > 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 04 March 2018 at 23:59 Leo Bodnar <leo@leobodnar.com> wrote:

 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 LT more but all this is still armchair engineering. The only way to know is stick it on the board and check.

 Note that PLL133-37 is AC coupled internally so not suitable for short sharp spikes or low frequencies.

 Cheers
 Leo

 On 4 Mar 2018, at 10:20, Bruce Griffiths wrote:

     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 <leo@leobodnar.com> wrote:

     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

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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 <leo@leobodnar.com> wrote: > > 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 LT more but all this is still armchair engineering. The only way to know is stick it on the board and check. > > Note that PLL133-37 is AC coupled internally so not suitable for short sharp spikes or low frequencies. > > Cheers > Leo > > On 4 Mar 2018, at 10:20, Bruce Griffiths wrote: > > > > > > 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 <leo@leobodnar.com> wrote: > > > > 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 > > > > > > _______________________________________________ > 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. >