17 | Keysight | N4960A Serial BERT 17 and 32 Gb/s - Data Sheet
N4960A clock source/BERT controller jitter specifications
Configuration
Calibrated stress is added to Jitter Clock Output and the Jitter remote head port clock through one of two
modulators: a high deviation, low frequency path, or a low deviation, high frequency path. The amplitude of
any stress appearing on the front panel Jitter Clock Output will be 1/2 of the value appearing at the N4951A/B
remote head pattern generator data output (if connected to the Jitter port). Changing stress amplitudes on
the front panel Jitter Clock Output will also change the level appearing on the pattern generator data output
(connected to the Jitter port).
Options
N4960A-CJ0
Single tone sinusoidal jitter, low (SJ) and high (PJ) deviation, plus external input
N4960A-CJ1
SJ frequency range
Two internal sinusoidal jitter, true random (RJ) jitter, plus external input
With no pattern generator head connected to Jitter port:
1 Hz to 200 MHz
With an N4951A/B pattern generator head connected to the Jitter port:
1 Hz to 150 MHz, over-programmable to 200 MHz
Range of SJ1 and SJ2. The maximum combined peak jitter of SJ1 + SJ2 +
RJ (p-p) + external jitter are applied to the high frequency band modulator
(see Figures 25 and 26)
SJ modulation range
With no pattern generator head connected to the Jitter port:
Front panel output frequency 1 GHz to 0 to 1.0 UI p-p for modulation frequency 1 Hz to 100 MHz,
3 GHz
0 to 0.5 UI p-p for modulation frequency > 100 MHz to 200 MHz, over-programmable to 1.0 UI
Front panel output frequency > 3 GHz 0 to 1.0 UI p-p for modulation frequency 1 Hz to 100 MHz,
to 16 GHz
0 to 0.7 UI p-p for modulation frequency > 100 MHz to 200 MHz, over-programmable to 1.0 UI
With an N4951A/B pattern generator head connected to the Jitter port:
Front panel output frequency > 2 GHz 0 to 0.4 UI p-p for modulation frequency 1 Hz to 30 MHz, 4 to 32 Gb/s
to 16 GHz
0 to 0.165 UI p-p for modulation frequency >30 MHz to 150 MHz, 4 to 29 Gb/s
0 to 0.1 UI p-p for modulation frequency >30 MHz to 150 MHz, >29 to 31.5 Gb/s
over-programmable to 0.5 UI
RJ modulation frequency contour
RJ modulation range
Flat from DC to modulator band pass: –3 dB @ 320 MHz, single pole roll off to 500 MHz. Loop through allows
user to customize contour by inserting HPF or LPF in loop on rear panel. Nominal impedance is 50 Ω. Filter
insertion loss will lower RJ modulation depth below calibrated value
With no pattern generator head connected to the Jitter port:
0 to 25 mUI rms, can be set up to 150 mUI rms, to allow for insertion loss in external filters, but is uncalibrated
for settings > 25 mUI. Peak sum of all SJ, RJ and External input applied to high frequency modulation input is
limited. Refer to SJ modulation range specification or
Figures 25 or 26.
With an N4951A/B pattern generator head connected to the Jitter port:
0 to 12 mUI rms, 4 to 29 Gb/s
0 to 7 mUI rms, >29 to 31.5 Gb/s
Over-programmable to 25 mUI
14 minimum (p-p to rms ratio)
RJ crest factor
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