Rohde & Schwarz SMIQ02B - Use of Winiqsim

Arbitrary Waveform Generator ARB SMIQ
1125.5555.03 E-92.344
The trigger facilities of the SMIQB60 are similar to those of the data generator SMIQB11 (see Digital
Modulation). The trigger generator consists of programmable counters which generate a periodic
sequence with a pulse duty ratio of On Time/Off Time with settable start delay. E.g., to generate a slot
trigger for a W-CDMA signal with a chip rate of 3.84 MHz, the following values are set:
t
Slot
= Slot time
t
Chip
= Chip time
t
a
= Sampling time
t
Slot
= 625µs = 2400 t
Chip,
t
Chip
= ov * t
a
, ov = 2, => t
Chip
= 4800 * t
a
On Time = 100 (for example) => Off Time = 4700.
The trigger signals are time-synchronous with the I/Q output signals. WinIQSIM supports the generation
of predefined trigger signals (see Use of WinIQSIM Software).
Fig. 2-217 Trigger signals SMIQB60
2.21.1.1 Use of WinIQSIM
The SMIQB60 is supported by WinIQSIM starting with version 3.30. Waveforms can be loaded via the
IEC/IEEE bus into the FLASH memory, an individual operating menu allows for setting numerous SMIQ
parameters. It must be noted that settings of WinIQSIM cannot be read from the waveform. WinIQSIM
provides predefined settings for bit and symbol clock for the generation of trigger signals, slot and frame
trigger and the restart signal for the BERT (SMIQB21). Si and filter compensation is not supported by
WinIQSIM since these functions are carried out directly on the SMIQB60. Waveforms which contain
these corrections may also be loaded in the SMIQB60. This is recognized and the internal correction
filters are modified accordingly.