Operating Manual R&S SMIQ - Volume 1 - Rohde & Schwarz

SMIQARB SystemDifferent output levels are applied to the output connectors of the SMIQ:Binary value of the sampleidentical with the value ofthe waveform D/A converterAsymmetricoutputsamplitude V p at 50 Ω betweeninner and outer conductor of Iand Q outputIVpValid as Q output also!OUTP:I|Q FIX 0x300 (768)0x8000 (32768)0xFD00 (64768)0 V0.25 V0.5 VOUTP:I|Q VAR 0x300 (768) 0 VOUTP:I|Q INVSame level as thewaveform for VAR,phase shifted by 180°0x8000 (32768)0xFD00 (64768)0.5 V1 V3.5.4.2 Creating a Waveform „Manually“We will use to example of a sine function in the I channel and a cosine function in the Q channel, eachwith 20 points, to explain how a waveform file SICO.WV is generated.The sine and cosine values are calculated by a short program written in the programming language C(see the following example for creating a C-program). They are stored in the file SICO.TXT as follows:Contents of SICO.TXT:Sine (I) Cosine (Q)0.000000 1.0000000.309017 0.9510570.587785 0.8090170.809017 0.5877850.951057 0.3090171.000000 -0.0000000.951056 -0.3090170.809017 -0.5877850.587785 -0.8090170.309017 -0.951056-0.000000 -1.000000-0.309017 -0.951057-0.587785 -0.809017-0.809017 -0.587785-0.951056 -0.309017-1.000000 0.000000-0.951056 0.309017-0.809017 0.587785-0.587785 0.809017-0.309017 0.951057The decimal values in SICO.TXT should be normalized suchthat they are in the between –1.0 and +1.0.The waveform file SICO.WV will be based on the contents ofthis file.1125.5555.03 3.25E-9