Vector Modulation SMIQ
1125.5555.03 E-82.68
IQ FILTER
Only available with option SMIQB47.
Selection between no filter and a 850 kHz, a 2.5 MHz or a 5 MHz lowpass in
the baseband. A filter of these types suppresses noise in the baseband above
900 kHz, 3 MHz or 6 MHz, which improves ACP (Adjacent C
hannel Power) for
IS95 and W-CDMA. The frequency response of the filter is automatically
compensated for DIGITAL MOD and DIGITAL STD in MCOD, which means
that the EVM (Error Vector Magnitude) gets hardly worse. For VECTOR MOD
and AMIQ with WinIQSIM as source, the frequency response is also
compensated in WinIQSIM. For applications requiring a minimum EVM, the IQ
filter should be set to OFF.
OFF no filter
850 kHz 850 kHz lowpass
2.5 MHz 2.5 MHz lowpass
5 MHz 5 MHz lowpass
IEC/IEEE-bus commands :SOUR:DM:IQ:FILT:STAT ON|OFF
:SOUR:DM:IQ:FILT:FREQ 2.5MHZ
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