Specifications

26
Modules Specifications
TDR System
86100C Option 202 characteristics
Return loss Attenuation
Return loss uncertainty – phase
*See end notes for additional phase uncertainties
GHz
Degrees
30
20
10
0
–10
–20
–30
6 dB
6 dB
12 dB
12 dB
20 dB
20 dB
26 dB
26 dB
3 6 9 12 16
Attenuation uncertainty – phase
*See end notes for additional phase uncertainties
GHz
Degrees
30
20
10
0
–10
–20
–30
6 dB
6 dB
12 dB
12 dB
20 dB
20 dB
30 dB
30 dB
40 dB
40 dB
3 6 9 12 16
Test conditions
• Mainframe and module have been turned on for at least one
hour and have been calibrated
• TDR calibration has been performed using N1024B
• Internal measurements use 54754A as stimulus and either
54754A or 86112A as receiver
• External measurements use 54754A and Picosecond Pulse
Labs Accelerator as stimulus and 86118A as receiver
• All characteristics apply to single-ended and differential
• Derived from measurements of wide range of devices
compared to vector network analyzer measurements
• Averages of 256 except as noted in dynamic range
Phase uncertainty
• Longer equipment warm-up times and careful calibration
provide the best phase performance – perform module and
TDR calibrations again if temperatures change
• Phase uncertainty is the sum of the uncertainty from the
desired graph plus the two additional components which are
estimated below
• Sampling points - S-parameters are determined from the
sampling points record length
1
over the time interval, which
is time per division multiplied by ten divisions. The reference
plane is determined to nearest sampling point with uncertainty
given by this equation:
Uncertainty in degrees
=
time per division (sec)
*
10 divisions
*
f (Hz)
*
360
(sampling points) 4096
*
2
Simplified version = time per division (sec)
*
f(Hz) / 2.28
• Time base drift with temperature - the amount of drift can be
observed by placing the calibration short at the reference plane
and reading the amount of time difference in picoseconds. The
phase uncertainty is given by this equation:
Uncertaintyindegrees(tempdrift)=timediff(sec)•frequency(Hz)
*
360
Performance characteristics for 86100C Option 202
1. Record length is user-defined from 16 to 16384 (firmware 8.0 or above).
However, the minimum record length used for S-parameters is 4096,
independent of user settings.