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Real-Time I/Q Baseband Generator User’s and Programming Guide
Using Functions
HP ESG Family Signal Generators
Creating User-Defined FIR Filters
Options UN8 and 202
Using Windowing to Modify Default FIR Filters
1. Access the Load Default FIR menu again and select the Nyquist filter.
2. Add Kaiser windowing by pressing
Window
>
Kaiser
.
3. The Beta factor is automatically activated when the Kaiser windowing function is
selected. The default value provides a good compromise for optimizing out of band
performance (ACP) without seriously compromising passband performance (EVM). For
this example, increase the Beta factor to 8 which will further improve ACP.
4. Press
Return
>
Return
>
Generate
. The FIR table editor should now contain the
coefficient values for the specified Gaussian filter with Kaiser windowing.
5. Press
Display Impulse Response
for a graphic representation of the filter impulse
response as shown here:
6. To return to the menu keys, press
Return
.
Storing the Filter to Memory
Содержание ESG series
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