Operating Manual Vol 1 - ES Documentation

Arbitrary Waveform Generator ARBSMIQThe trigger facilities of the SMIQB60 are similar to those of the data generator SMIQB11 (see DigitalModulation). The trigger generator consists of programmable counters which generate a periodicsequence with a pulse duty ratio of On Time/Off Time with settable start delay. E.g., to generate a slottrigger for a W-CDMA signal with a chip rate of 3.84 MHz, the following values are set:t Slot = Slot timet Chip = Chip timet a = Sampling timet Slot = 625µs = 2400 t Chip, t Chip = ov * t a , ov = 2, => t Chip = 4800 * t aOn Time = 100 (for example) => Off Time = 4700.The trigger signals are time-synchronous with the I/Q output signals. WinIQSIM supports the generationof predefined trigger signals (see Use of WinIQSIM Software).Fig. 2-217Trigger signals SMIQB602.21.1.1 Use of WinIQSIMThe SMIQB60 is supported by WinIQSIM starting with version 3.30. Waveforms can be loaded via theIEC/IEEE bus into the FLASH memory, an individual operating menu allows for setting numerous SMIQparameters. It must be noted that settings of WinIQSIM cannot be read from the waveform. WinIQSIMprovides predefined settings for bit and symbol clock for the generation of trigger signals, slot and frametrigger and the restart signal for the BERT (SMIQB21). Si and filter compensation is not supported byWinIQSIM since these functions are carried out directly on the SMIQB60. Waveforms which containthese corrections may also be loaded in the SMIQB60. This is recognized and the internal correctionfilters are modified accordingly.1125.5555.03 2.344E-9