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Use DS345 as pulse generator

Posted: 23 Apr 2009     Print Version  Bookmark and Share

Keywords:DS345  pulse generator  waveform 

The DS345 can easily be used as a pulse generator, says Stanford Research Systems. Pulse widths down to 500 ns with rise/fall times of 30 ns are possible. You can even do bursts of groups of pulses (each pulse has to be the same width and separated by one pulse width).

This application note discusses the procedure for using DS345 as pulse generator. Start with a square wave as the main waveform, selecting the square wave frequency (1 MHz max.) so that half of a period is the width of the pulse you want. Then choose burst modulation, with a burst count of one, and turn on the Burst/Sweep function. Use the phase control to adjust the phase of the square wave within the burst so that only a positive going (or negative going) half cycle is visible (generally a phase shift of 180 degrees for a positive pulse).

Note that by varying the phase you can also delay a pulse by up to one half a period of the frequency, with respect to an external trigger. Finally, use the offset control to adjust the baseline of the pulse to be 0 V. You will have to start with a square wave amplitude of at most one half of the maximum DS345 peak-to-peak amplitude. This gives a maximum pulse amplitude of 10 V into high impedance loads, or 5 V into 50Ω loads.

View the PDF document for more information.





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