How can I create delays for many digital outputs?

I use a PXI 6537 DAQ card to produce four digital signals for each starting at a different time. In order to create this delay the appropriate number of '0' have been placed at the front of the boolean table before converting it into a digital signal. It works by creating the delay, however using this process, the delay may be discrete increments equal to 1/╔chantillonnage and my card can be up to 50 MHz, this means that I can produce only delays 20ns increments (check my calculations). For my application, I need to be able to control the time until the second nano. Delays will usually be more than 20 ns, but less than 40ns. I tried to use the entry 'to' the 'build waveform.vi' but it doesn't seem to do anything to manipulate the data. The sub VI used to create the waveform is attached. Sending the data isn't a problem. Thanks in adavnce for any suggestion.

JS

Hi JS.

The 6537 allow placement of subsample edge on its i/o lines.  The best you can do is unique (like you the noticed) examples of resolution (20 ns @ 50 MHz).

Have you looked at the SMU-6545?  It is a 200 MHz Board, which means that you will get 5 placement ns, as WELL as data delay feature which lets you place your samples with ~ 150ps resolution compared to the output clock.

Are you having to change the location of a signal in the clock period each cycle?  Or is the position fixed by reference to the clock, but must be placed exactly?

Thank you

Keith Shapiro

National Instruments R & D

Tags: NI Hardware

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