Agilent X-Series Signal Generators User’s Guide 355
Custom Digital Modulation (Option 431)
Using Finite Impulse Response (FIR) Filters with Custom Modulation
NOTE To change the filter Bbt, press Mode > Real-Time Custom Modulation > Modulation Setup > Filter >
Select Gaussian > Filter Bbt.
Enter a new value between 0.1 and 1.
Creating a User–Defined FIR Filter Using the FIR Table Editor
In this procedure, you use the FIR Values table editor to create and store an 8–symbol, windowed
sync function filter with an oversample ratio of 4.
Accessing the Table Editor
1. Press Preset.
2. Press Mode > ARB Custom Modulation > Single Carrier Setup > Filter > Select > Nyquist.
3. Press Filter > Define User FIR.
4. Press More 2 of 2 > Delete All Rows > Confirm Delete of All Rows.
This will initialize the table editor as shown in Figure 13- 33.
Figure 13-33 Creating a User–Defined FIR Filter Using the FIR Filter Table Editor
Mode > ARB Custom Modulation> Single Carrier Setup > Filter > Define
User FIR > More > Delete All Rows > Confirm Delete of All Rows
Opens a menu that
enables you to select
and load a saved file
into volatile memory.
See page 45.
page 215
Active only when:
FIR filter coefficient table
has minimum of two
values visible.
For details on each key, use key help as described on page 44.
Note:
Modulation filters are typically real and have an oversample ratio (OSR) of two or greater.
Equalization filters are typically complex and have an oversample ratio (OSR) of one (Dual ARB only).
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