Isolation (Crosstalk, EXF and EXE)
Description
Isolation is a measure of the leakage between the test ports and the signal
paths The isolation error terms are characterized by measuring transmission
(S21,
S12)
with loads attached to both ports during the error-correction
procedure. Since these terms are low in magnitude, they are usually noisy
(not very repeatable). The error term magnitude changes dramatically with
IF bandwidth: a 10 Hz IF bandwidth must be used in order to lower the noise
floor beyond the crosstalk specification. Using averaging will also reduce the
peak-to-peak noise in this error term.
Significant System Components
w
sampler crosstalk
Affected
Measurements
Transmission measurements, (primarily where the measured signal level is very
low), are affected by isolation errors. For example, transmission measurements
where the insertion loss of the device under test is large.
Figure 11-5.
sg638s
Typical
EXF/EXR
with 10 Hz Bandwidth and with 3 Id& Bandwidth
11.14 Error Terms
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