IDT DAC1627D Quick Start Manuals Download Page 40 | Manualshive

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IDT DAC1627D Quick Start Manuals Download Page 40

40

How to specify the correct settings for the Spectrum analyzer?

When measuring

Inter-

Modulation product (IMD3)

, you

need to take care about the

third

order distorsion

of the analyzer.

Maximum value

that could be measured from

the equipment in this specific settings (RBW).

DANL
(link to RBW)

Third order
distorsion from
the equipment

Warning:

Please refer to the Spectrum

Analyzer Datasheet to get the real value for
TOI and SHI

Optimum power level

in front of the mixer.

The

attenuation

need to be adjusted to fit this

parameter.

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Summary of Contents for DAC1627D

Page 1: ...1 DAC1627D Demo boards Quick Start v2...

Page 2: ...2 CGAP2 board Storage and Generation of complex patterns up to 32M I Q words DAC1627D board DAC1627D demoboard CGAP2 Board presentation...

Page 3: ...3 DAC1627D SPI USB control CGAP2 USB Power 5 Vdc SMA100A clock generator DAC clock Power 5 Vdc PXA spectrum analyzer DAC1627D demoboard CGAP2 Board connections PXA spectrum analyzer...

Page 4: ...ower Generator Qout DAC CGAP2 QSH connector SPI LVDS clk Divider 2 4 8 splitter global clk Iout Qout One Global clock is used for both DAC board and CGAP2 board This Global Clock is split on two signa...

Page 5: ...5 CGAP2 board Storage and Generation of complex patterns up to 32M I Q words DAC1627D BGX7100 board DAC1627D BGX7100 IQMod demoboard CGAP2 Board presentation...

Page 6: ...USB control CGAP2 USB Power 5 Vdc SMB100A clock generator DAC clock 737 28MHz 5dBm Power 6 Vdc SMA100A clockgen IQMod clock 2GHz 0dBm PXA spectrum analyzer DAC1627D BGX7100 IQMod demoboard CGAP2 Boar...

Page 7: ...Power Generator Qout DAC External generator LO Synthe clock CGAP2 QSH connector SPI LVDS clk Divider 2 4 8 splitter BGX7100 AQM global clock One Global clock is used for both DAC board and CGAP board...

Page 8: ...S0 S1 S2 jumpers are used to configure the divider ratio for the clock feeding the CGAP board For the current software revision the ratio value needs to be set to 2 Please make sure that the jumpers...

Page 9: ...CLOCKS generation Global Clock and LO 9 Spectrum measurement Bench overview...

Page 10: ...10 IDT DAC1627 SPI Software...

Page 11: ...CGAP and DAC1627 controls Main Application 3 1 2 To use the IDT_DAC1627D software the LabVIEW Runtime 8 6 needs to be installed first This Runtime could be found on the folder named 1_LabVIEW Runtime...

Page 12: ...CGAP board control panel overview 12...

Page 13: ...nt any hardware issue when closing the program please use the EXIT button to close properly the USB connexion Do not use the X button otherwise the USB connexion will still be alive and the program wo...

Page 14: ...Specify the Global Clock frequency provided to the DAC board 3 Specify the interpolation factor programmed in the DAC1627D 4 Specify the clock phase realtionship between the LVDS clock and the DATA co...

Page 15: ...Create Patterns and program CGAP memories 1 3 15 Select the Create Patterns tab...

Page 16: ...cify the Frequency of the first tone Hz d Specify the Amplitude of the first tone dBFS e Click Two Tones if needed f Specify the Frequency of the second tone Hz g Specify the Amplitude of the second t...

Page 17: ...spectrum of the generated signal is displayed The size of the pattern indicator is refreshed The LED indicators diplays the status of the CGAP board Programmed and Generation The generation of the sig...

Page 18: ...P board 18 When Generation is in progress the GEN LED is ON green When the clock configuration is correctly set the ALIVE LED is blinking green When the ERROR LED is blinking red the clock configurati...

Page 19: ...e already available with the software You need to specify the DATA rate w and the type x of signals Radio or Sines waves Then I file and Q file need to be selected y Press Load in Memory z to store th...

Page 20: ...gnal Each subfolder is splitted in two subfolders names Radio and Sinewaves The Radio subfolder contains the Radio complex patterns WCDMA GSM etc The Sinewaves subfolder contains the basic single or d...

Page 21: ...DAC controls panel overview 21...

Page 22: ...You first need to press Re INIT USB device to be sure that the PC is able to communicate with the DAC1617D All the registers could be read to update the Graphical User Interface by pressing READ from...

Page 23: ...DAC Main Configuration 23 Main parameters of the DAC settings NCO interpolation could be programmed from the Main tab...

Page 24: ...type of modulation Positive or negative refers to the position of the final signal compare to the LO position after the Iqmod Upper and Lower refers to the position of the signal compare to the NCO p...

Page 25: ...n factor need to be specified in two pages In the Main tab please specify the interpolation ratio In the Data Format INTR tab please specify the CDI mode Please respect the follwing table Interpolatio...

Page 26: ...DAC digital Adjustement 26 DAC digital tuning tab allows to update digital gain phase correction clipping of the I Q channels to help the I Q balance at the AQM input...

Page 27: ...Image Rejection compensation window allows to instantaneously update the I Q gain and the phase compensation Mouse or keyboard interface could be use to update the values Notice This feature is exper...

Page 28: ...DAC analog adjustement 28 DAC analog tuning tab allows to update the analog gain the auxiliary DACs...

Page 29: ...Multi Devices Synchronization 29 MDS tab allows to tune the settings for the multi devices synchronization...

Page 30: ...LVDS Clock Control 30 LVDS buffer are automatically calibrated with regard to the LVDS clock input The tab allows to enable disable the automatic manual calibration...

Page 31: ...Data Input Formatting 31 Interleace Folded bit inversions of the input interface could be set up in the Data input formatting tab...

Page 32: ...Test 32...

Page 33: ...Registers 33 All the registers pages could be read and save from the Registers tab...

Page 34: ...Tools 34 Tools tab allows to see the output spectrum related to the folded image at the DAC output...

Page 35: ...35 Spectral measurements How to correctly setup your spectrum analyzer...

Page 36: ...nd performances therefore a correct measurement setup need to be established to get the real performances of the devices and not the bad performances of the spectrum Please refers to the Application N...

Page 37: ...he correct settings for the Spectrum analyzer Mixer will created second and third order distorsion if too much power is send at its input Attenuation needs to be correctly set up to avoid the mixer s...

Page 38: ...d to measure the distorsion created by the equipment Third order distorsion created by the Spectrum Analyzer Second order distorsion created by the Spectrum Analyzer Displayed Average Noise Level due...

Page 39: ...of the analyzer Maximum value that could be measured from the equipment in this specific settings RBW DANL link to RBW Second order distorsion from the equipment Warning Please refer to the Spectrum A...

Page 40: ...sion of the analyzer Maximum value that could be measured from the equipment in this specific settings RBW DANL link to RBW Third order distorsion from the equipment Warning Please refer to the Spectr...

Page 41: ...yser mixer a 40dB attenuator level need to be set it also depends of the RBW If the signal is about 10dBm then use 30dB of attenuation to get 10 30 40dBm at the mixer input When measuring Intermodulat...

Page 42: ...42 Spectral measurements Understand OIP3 IMD3 after IQModulator...

Page 43: ...Third Order Intercept measurements 43 Please refers to the Application Note from Agilent for more details...

Page 44: ...nt IP3 or TOI is a measure for nonlinear systems and devices The third order intercept point relates nonlinear products caused by the third order nonlinear term to the linearly amplified signal in con...

Page 45: ...BGX7100 OIP3 45 OIP3 value is about 26dBm for 2GHz LO frequency...

Page 46: ...Intermodulation see at DAC outputs 46 No intermodulation after DAC...

Page 47: ...Intermodulation after IQMod 2Ghz 47 Output Power 6 33dBm dBc 63 12 OIP3 6 33 63 12 2 25 23dBm The main contribution for the intremodulation is coming from the IQmod...

Page 48: ...48 Standard Filter between DAC1627D and BGX7100...

Page 49: ...27D and BGX7100 Refers to schematics PCB2227 1 0_17243 DOS_PCB2227 1 0_17243 PCB2227 1 200 00_1_2 pdf L101 L104 39nH L102 L105 47nH L103 L106 18nH C165 10pf C166 6 8pf L107 L110 39nH L108 L111 47nH L1...

Page 50: ...Filter response 50...

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