364 Keysight CXG, EXG, and MXG X-Series Signal Generators Programming Guide
Creating and Downloading User–Data Files
Using the Equalization Filter
Using the Equalization Filter
An equalization FIR file can be created externally, uploaded via SCPI, and
subsequently selected from the file system (refer to the User’s Guide). For
information related to downloading FIR file coefficients, refer to the “FIR Filter
Coefficient Downloads” on page 360. For information regarding working with
FIR file coefficients manually, refer to the User’s Guide. For more information
on equalization filters, refer to the User’s Guide.
This filter can be used to correct and/or impair the RF and External I/Q outputs
for the internal I/Q source. This filter will be convolved with the ACP Internal
I/Q Channel Optimization filter if that filter is selected, the result of which will
be truncated to the center 256 taps. The equalization filter operates at
125MHz (200MHz for N5166B/72B/82B), so all equalization filters must be
resampled to 125MHz (200MHz for N5166B/72B/82B) prior to selection, if they
are sampled at some other rate.
The signal generator supports equalization filters—either Complex or Real—
that are programmable FIR filters with two inputs (I, Q) and two outputs (I, Q)
per sample. This 256-tap filter has two modes of operation:
The equalization filter can be turned on and off.
This section applies to vector models with an installed baseband generator
option.
The maximum number of taps is 256 (with 2 coefficients per tap for a
complex filter) for equalization filters. The minimum number of taps is 2.
Equalization filters can also be referred to as predistortion filters or
correction filters.
Type of Filter Description
Real The I and Q samples are independently filtered by a single set of real coefficients.
Complex The samples are treated as complex (I + jQ) and convolved with the filter coefficients which are
specified as (I + jQ) in the time domain.
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