SC5305A Operating & Programming Manual
61
Input compression point (dBm)
100 MHz – 1 GHz
1 GHz – 2.5 GHz
2.5 GHz – 3.9 GHz
Preamplifier disabled
1
1.5
2
Preamplifier enabled
-23
-20
-19
Dynamic range
Measurement dynamic range
(30)
............................................................................................................. > 185 dB
Instantaneous dynamic range
(31)
............................................................................................................ > 150 dB
Figure 15. Instantaneous dynamic ranges plotted with preamplifier disabled for 1000 MHz measured data. Mixer
level is at input level.
-150
-140
-130
-120
-110
-100
-90
-80
-70
-60
-50
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
N
o
ise
an
d
d
isto
rtion
r
e
lativ
e
to
m
ixer
level
(d
B
)
Power level @ input mixer (dBm)
0 dB RF atten, Preamp off, 20 dB IF gain
3rd Order IMD
2nd Harmonic Distortion
Noise
(30)
Measurement dynamic range refers to the device SNR measurement capability using two or
more configurations settings. For example, the user could set in sufficient RF attenuation to
capture the high level signals and then turn on the preamplifier to measure low level noise.
(31)
Instantaneous dynamic range refers to the instantaneous device SNR measurement using a
single configuration setting. For example, the user could set the downconverter to receive a 0
dBm signal at the mixer, while at the same setting be able to measure the signal noise floor to
-150 dB below its peak.