Appendix A: Specifications
24
P7330 3.5 GHz Differential Probe User Manual
Figure 12 shows the typical common-mode gain of the probe. The
CMRR can be approximated by subtracting the common-mode gain
from the --14 dB reference level. For example, --80 dB CM gain
66 dB CMRR.
Frequency
10 MHz
1 MHz
100 MHz
--44
--52
--60
--68
--76
--84
1 GHz
Ga
in
dB
Figure 12: Typical common-mode gain
The graph in Figure 13 represents simulation results of a first order
model of the probe input.
Frequency (Hz)
10 M
Impedance (
Ω
)
100 k
10 k
1 k
100
10
100 M
1 G
1 M
Figure 13: Typical differential input impedance vs frequency
