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DS345 as a Pulse Generator
Application Note #12



DS345 as a Pulse Generator with Variable Duty Cycle
The DS345 can easily be used as a pulse generator. Pulse           amplitude of 10 V into high impedance loads, or 5 V into
widths down to 500 ns with rise/fall times of 30 ns are            50 ohm loads.
possible. You can even do bursts of groups of pulses (each
pulse has to be the same width and separated by one pulse          After setting this up, changing the burst rate will change the
width).                                                            pulse repetition rate, and changing the square wave frequency
                                                                   will change the pulse width. To do groups of pulses, simply
Procedure                                                          increase the burst count to the number of pulses you want in
                                                                   the burst. Use the trigger input connector and set the trigger
Start with a square wave as the main waveform, selecting the       control to external (positive or negative) for externally
square wave frequency (1 MHz max.) so that half of a period        triggered bursts. If the source of the trigger has a 10 MHz
is the width of the pulse you want. Then choose burst              clock input, connecting this to the DS345 clock output will
modulation, with a burst count of one, and turn on the             reduce pulse-to-pulse jitter.
Burst/Sweep function. Use the phase control to adjust the
phase of the square wave within the burst so that only a           Arbitrary Waveform
positive going (or negative going) half cycle is visible
(generally a phase shift of 180 degrees for a positive pulse).     The other way to create pulses is using arbitrary waveforms,
Note that by varying the phase you can also delay a pulse by       which can be done from the front panel using vector entry
up to one half a period of the frequency, with respect to an       mode, or through the GPIB or RS-232 interfaces. Pulse widths
external trigger. Finally, use the offset control to adjust the    down to 50 ns, with repetition rates of up to 2 MHz, are
baseline of the pulse to be 0 V. You will have to start with a     possible.
square wave amplitude of at most one half of the maximum
DS345 peak-to-peak amplitude. This gives a maximum pulse




             Stanford Research Systems                                                              phone: (408)744-9040
                                                                                                      www.thinkSRS.com

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