NB3L853141

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6

NB3L853141

Additive Phase Jitter @ 155.52 MHz

VDD = 3.3 V

12 kHz to 20 MHz = 40.3 fs (typical)

Filter = 12 kHz − 20 MHz

Source RMS Jitter = 123.13 fs

Output RMS Jitter = 129.56 fs

RMS addititive jitter

40.3 fs

Output (DUT + Source)

Input Source

155.52 M Source, F_carrier = 155.52 MHz

NB3L853141 F_carrier = 155.52 MHz

The above phase noise data was captured using Agilent

E5052A/B. The data displays the input phase noise and

output phase noise used to calculate the additive phase jitter

at a specified integration range. The RMS Phase Jitter

contributed by the device (integrated between 12 kHz and

20 MHz) is 40.3 fs.

The additive phase jitter performance of the fanout buffer

is highly dependent on the phase noise of the input source.

To obtain the most accurate additive phase noise

measurement, it is vital that the source phase noise be

notably lower than that of the DUT. If the phase noise of the

source is greater than the device under test output, the source

noise will dominate the additive phase jitter calculation and

lead to an artificially low result for the additive phase noise

measurement within the integration range. The Figure above

is a good example of the NB3L853141 source generator

phase noise having a significantly higher floor such that the

DUT output results in an additive phase jitter of 40.3 fs.

RMS addititive jitter

40.3 fs