
1 Approximate HP 3048A Phase Noise Floor vs. R Port Signal Level
Approximate Phase Noise Floor (dBc/Hz)
f> 10 kHz
L Port Signal Level Is Assumed to be Appropriate for the Phase Detector
Description
The sensitivity of the HP 3048A System can be improved by increasing the
signal power at the R input port of the Phase Detector in the HP 11848A.
This graph illustrates the approximate noise floor of the system for a range
of R input port signal levels from —15 dBm to +15 dBm. The diagonal
line on the left side indicates the approximate sensitivity for offsets greater
than 10 kHz without the system's low noise amplifier in the signal path.
The right diagonal line indicates the sensitivity with the amplifier in.
These estimates of sensitivity assume the signal level at the L port is
appropriate for either the microwave or the RF mixer that is used (+7 dBm
or +15 dBm, respectively). The approximate Phase Detector calibration
Constant K$ that results from the input signal level at the R port is
shown on the right side of the graph. (Refer to Calibr Process in Chapter
2,
Measurement Definitions, for more information about calibration of the
Phase Detector Constant.)
7-2 Quick Reference
Komentarze do niniejszej Instrukcji