:JSAMemory:PLLoop:OJTF:DFACtor?
Instrument:
DCA-X
DCA-M
Meas. mode:
Scope
Eye
Jitter
Flex Apps:
FlexDCA
Query Syntax
:JSAMemory:PLLoop:OJTF:DFACtor?
Query Response
Returns <damping_factor> which is a double.
Description
From the JSA memory database, returns the clock recovery emulation's damping factor of a second-order PLL's Observed Jitter Transfer Function (OJTF). The following table shows the damping factor settings for some standards.
OJTF for 2nd Order PLLs
| Standard | Damping Factor |
|---|---|
| SAS 1.5 Gb/s | 50.0 |
| SAS-SSC 1.5 Gb/s | 0.860 |
| SATA 1.5 Gb/s | 0.767 |
| SAS 3.0 Gb/s | 50.0 |
| SAS-SSC 3.0 Gb/s | 0.860 |
| SATA 3.0 Gb/s | 0.860 |
| SAS 6.0 Gb/s | 50.0 |
| SAS-SSC 6.0 Gb/s | 0.860 |
| SATA 6.0 Gb/s | 0.767 |
| QPI | 0.800 |
| USB 3.0 | 0.707 |
JSA requires an 86108A/B module with Option JSA. To use JSA in Jitter Mode, 86100D Option 200 Enhanced Jitter Analysis or N1010A Option 200 Enhanced Jitter Analysis is required.
Requires FlexDCA revision A.02.50 and above.