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P6330 3.5 GHz Differential Probe Instruction Manual
Figure 11 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
equals +66 dB CMRR.
Frequency
10 MHz1 MHz 100 MHz
-- 4 4
-- 5 2
-- 6 0
-- 6 8
-- 7 6
-- 8 4
1GHz
Gain dB
Figure 11: Typical common-mode gain
The graph in Figure 12 represents simulation results of a first order
model of the probe input.
Frequency (Hz)
10 M
Impedance (Ω)
100 k
10 k
1k
100
10
100 M
1G
1M
Figure 12: Typical differential i nput impedance vs frequency