Keysight EXG and MXG X-Series Signal Generators User’s Guide 217Basic Digital Operation for N5172B/82B with Options 653/655/656/657Using the Equalization FilterUsing the Equalization FilterAn equalization FIR file can be created externally, uploaded via SCPI, and subsequently selectedfrom the file system (refer to “Working with Files (Viewing/Storing/Loading/Moving)” on page 72).For information related to downloading FIR file coefficients, refer to the Programming Guide. Forinformation regarding working with FIR file coefficients manually, refer to “Modifying a FIR FilterUsing the FIR Table Editor” on page 225.This filter can be used to correct and/or impair the RF and External I/Q outputs for the internal I/Qsource. This filter will be convolved with the ACP Internal I/Q Channel Optimization filter if that filteris selected, the result of which will be truncated to the center 256 taps. The equalization filteroperates at 200 MHz, so all equalization filters must be resampled to 200 MHz prior to selection, ifthey are sampled at some other rate.The MXG/EXG supports equalization filters—either Complex or Real—that are programmable FIRfilters with two inputs (I, Q) and two outputs (I, Q) per sample. This 256-tap filter has two modes ofoperation:The equalization filter can be turned on and off.The maximum number of taps is 256 (with 2 coefficients per tap for acomplex filter) for equalization filters. The minimum number of taps is 2.Equalization filters can also be referred to as predistortion filters orcorrection filters.Type of Filter DescriptionReal 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 arespecified as (I + jQ) in the time domain.
