>> This is a good idea for testing.. > > Applying jitter frequencies for jitter tolerance testing is standard > stuff and needs to be done. Jitter tolerance curves match up with MTIE > tolerance curves very neatly. >
Of course, here is the weird part... It's not SONET; but it is a chip that can be used for SONET... This is for a very specific form of audio clocking (not audiophile, nor consumer) for a mastering engineering application. Common input clock frequencies: 44.1kHz to 96kHz or also a 10MHz rubidium. The DSP PLL is this chip (I am still learning the intricacies of this chip): https://www.silabs.com/Support%20Documents/TechnicalDocs/Si5326.pdf The system clock (to drive the DSP and the DSP's DCO) is essentially a jitter reference, pins XA and XB (differential, single ended capable); Jitter is transferred nearly 1:1 from XA,XB to CLK_OUT. This is the 38.88 MHz reference from Vectron with some skirting issues to be filtered before connected to the XA and XB pins. The input (on CLK_IN pins) is the source clock to be cleaned (e.g., 44.1kHz to 96kHz or 10MHz Rb). The output (on CLK_OUT pins) is 11 MHz to 25MHz for 256x oversampling master clock for ADCs and DACs 24-bit accuracy for 40kHz (88.2kHz to 96kHz sample rate encompassing a 45/55 anti-alias filter) shows the need for sub picosecond timing aperture uncertainty. Of course 24-bit in the real world is hard to achieve (even the new "32-bit" converters have a problem with it) with issues internal to the sampling mechanisms in a DAC / ADC, but with some out-of-band dither and thermal management, coupled with low jitter sampling clock, there may be an additional bit or so to be obtained. This is all part of the experiment.... >> I have Howard Johnson's book for >> I think a normal LC tank would be more suitable for that task. > > It's a good introductional level book for digital signals, but isn't > very applicable to waveshaping or clock characterisation and testing Yes, HJ's books leaves me wanting a little more... seems like an analogue / RF book for digital folks. I am looking for sharp Q to get rid of any skirt around the 38,88MHz of the Vectron OCXO. Temperature can be obtained from cooling componentry already in situ, such that a known temperature is established. Cheers, -chris _______________________________________________ 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.