:JSAMemory:PLLoop:OJTF:DFACtor?
Instrument:
N1000A
N109x
UXR Scope
Flex Apps:
FlexDCA
FlexRT
Meas. mode:
Scope
Eye
Jitter
Waveform type:
NRZ
PAM4
Package License:
L-RND
L-SNT
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, L-RND package license (includes feature F-JIT Enhanced Jitter Analysis) is required.
Requires FlexDCA revision A.02.50 and above.