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| Frequency reference clocks should .. |
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| nctnico:
--- Quote from: Detlev on January 28, 2023, 04:09:47 pm ---Hi all, Last year I tried to determine the jitter of audio DACs. At the time, I noticed that square-wave signals have a significantly better Allan-deviation than sine signals. During the setup, the SDG6022 and the FCA3000 are both attached to the Leo Bodnar GPSDO. Nevertheless, the time deviations in the signal for sine waves are worse by a factor of almost three. The Allen deviation is 150ps for sine and 60ps for square. --- End quote --- You have to be carefull with what you are measuring here. The noise of the input of the counter or the actual signal? IIRC your counter has a 100ps resolution only so you are measuring well into the noise floor. For measurements at these low jitter levels, a DMTD is a better tool. |
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