Home / Application Window / Signature Window

• Home
• Introduction
• Setup
• Application Window
  • Menus
  • Waveform Window
  • Configuration and Status Window
  • Module Parameter Window
  • Signature Window
  • Consoles
• Operation Details
• Using the GUI
• Single Board Operation
• Contact Us
• Euvis Inc.

Signature -

The signature page allows you to adjust the threshold voltages of the two signals that contribute to the DSM's chirping stability as well as several other auxiliary settings. Normally, we will provide you with a signature file which will have preconfigured settings for all the range of frequencies from 500 MHz up to about 2.5 GHz. Although we try our best to get the right settings, sometimes you will have to fine tune these settings.

The benchmark waveform is called "Standard Phase Slip" and can be found in the waveforms drop-down list in the Waveform Window. To benchmark frequencies, first set the input clock to 500 MHz and observe what the waveform looks like. Then change the input clock to the desired frequency. The waveform at any frequency should look like the waveform observed at 500 MHz. If it does not look like the same waveform, then you should try adjusting VREF and DATAN until the waveform looks similar to the benchmark waveform.

Clock Frequency - This should match your input clock frequency. Adjusting this will automatically adjust the signature to the settings for that frequency in the signature file if one exists. If the settings for a particular frequency does not exist then the VREF and DATAN will not change and will take on values for the last setting that did exist.

VREF - Adjusts the high speed RAM threshold voltage.

DATAN - Adjusts the DDS strobe threshold voltage.

ATE - Turns the ASIC setting ATE on or off. This might help in stabilizing the waveform.

DLL - Turns the high speed RAM setting DLL on or off. This might help in stabilizing the waveform.

CK2S - Turns the ASIC setting CK2S on or off. This might help in stabilizing the waveform.

Timing Controls - Generally these settings will have no effect on the DSM module.

INTNP Delay - Adjusts the tail end of the waveform. Generally for frequencies under 2.4 GHz, a setting of "8" will work and for frequencies at 2.4 GHz and above, a setting of "10" will work. If you do change this setting you will need to re-download the waveform.

To restart the memory after you change the settings, click on the Restart button. Sometimes you might need to re-download the waveform in the Waveform Window.

To save the settings at a particular frequency, click on the Record Signature button. After clicking on this button the settings will be saved to the signature file for future use. Note that the signature file is contained in your DSM program folder and is called "DSM303_SGN_0XX.dat" where "XX" is your board number. If you move or delete this file then the DSM GUI will not be able to recall any of the settings.