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In full rate sample mode with the use of appropriate lowpass fi ltering (Table
3) signal aliasing is completely avoided. In this case the “Operating Region” is
renamed “Alias Exposure Free Zone” to indicate this special condition.
NOTE: Does not apply to HF operation.
Although the operating regions for all digitizer models are similar, each model
or model family may have important differences in their operating region curves
due to differences in maximum sample rate, front-end analog performance, and
memory option. Appendix C provides the operating curves for all supported digi-
tizers and most memory options.
Figure 6. The true operating region is fully described when constrained by
all the previous parameters: number of frequency points, span, and digitizer
memory. See Appendix C for operating region charts for the various supported
digitizers.
1.E-08
1.E-07
1.E-06
1.E-05
1.E-04
1.E-03
1.E-02
1.E-01
1.E+00
1.E+01
1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07 1.E+08 1.E+09 1.E+10 1.E+11
Span (Hz)
Time record length (sec)
Minimum
Operating region: with span and memory constraints
Number of frequency points
204801
409601
102401
51201
25601
12801
6401
3201
1601
801
401
201
Operating region