Data Types; Output Mode; Input Mode - Agilent Technologies X Series User Manual

Digital Signal Interface Module (Option 003/004)

Data Types

Data Types
The following block diagram indicates where in the signal generation process the data is injected for
input mode or tapped for output mode.
Samples
Signal Generator
Data
Generator
Pre-FIR
Samples

Output Mode

When using an ARB format with no real- time modulation filter, the data type is always Samples and
no filtering is applied to the data samples. The samples are sent to the digital module at the ARB
sample clock rate and resampled.
For real- time formats or Dual ARB with a real- time modulation filter, choosing Samples as the data
type will send filtered samples to the digital module at the module's clock rate. Selecting Pre- FIR
Samples, sends unfiltered but potentially resampled samples to the module at the module's clock rate.

Input Mode

When the data type is Samples, the data samples coming through the digital module are injected at a
point that bypasses the filtering process.
If Pre- FIR Samples is selected, the data samples are injected before the filtering process.
The Filter softkey accesses a menu that enables you to set the desired filtering parameters.
268
Output
Output Mode
Mode
Pre-FIR
Samples
FIR
Filtering &
Resampling
Samples
Input
Mode
Input Mode
I,Q
DACs
Modulator
Agilent X-Series Signal Generators User's Guide
LO
RF
I/Q