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Precise pulse for verification

Johann Eduardo Baader
Prodigy 30 points
Other Parts Discussed in Thread: LM4132

Hello.

I am interested in a very precise voltage pulse generator that will be used as a verification system.

Basically, I would like to generate a pulse with an integrated voltage of approximately 0.1 Vs. Most importantly, I need to have the precision (repeatability ) of the integrated voltage from this pulse better than 1e-5 Vs. Both the time interval and the amplitude of the signal should be very precise. I am not concerned with the amplitude of the signal. A 10 V x 0.01 s pulse or a 2.5 V x 0.04 s (both examples have 0.1 Vs) will be fine.

Additional information:
- The device that will read the pulse signal is a NI module (PXI 4464);
- The pulse generator will be in a closed environment, with controlled temperature and humidity.
- Since we have space constraints, we are looking for small devices/components to provide the pulse.

I was wondering if someone could recommend me devices and/or components in order to achieve our goals.

The LM4132 seems to be appropriate for my application. But I am not familiar about which additional components I should include in order to make it works. 

Regards.

  • 0
    TI__Mastermind 19370 points
    Hi Johann Eduardo Baader,

    The LM4132 is a good choice for a very precise voltage reference. But I am slightly confused... where would this device be used in the system? Do you have a system designed yet?

    If not, TI does have reference designs that you can use start making a system:
    www.ti.com/.../source_generation__pulse_data_pattern_generators
    www.ti.com/.../slau508.pdf

    Best of luck,
    -MZ
  • 0 in reply to Marcoo Z
    Prodigy 30 points
    The general idea is to measure the magnetic field quality of magnetic devices. These devices will have a coil in their longitudinal axis. By changing the gap, the magnetic field will change. Consequently, the magnetic flux through the coil will also change, which will induce a voltage signal. We will use a PXI4464 module that will be used to read the signal, which is integrated numerically by a LabWindows/CVI code.

    Any change of the read integrated voltage could indicate a failure in the magnetic device. We are expecting an amplitude of approximately 0.1 Vs.

    The PXI chassis and the PXI module will be in a closed environment (controlled temperature and humidity), without access for at least 1-3 month.

    We are interested in a system that could generate a very precise pulse (or maybe a better sort of signal) that will be read from PXI4464 and could be used to verify if the PXI4464 is working properly. In other words, if we see a small change in the integrated voltage read from the magnetic device, we would like to know if that happened due some failure occurred in the magnetic device or if it was a drift in the PXI4464.
  • 0 in reply to Johann Eduardo Baader
    Prodigy 30 points

    Correction:

    "We are interested in a system that could generate a very precise pulse (or maybe a better sort of signal) that will be read using the PXI4464...

  • 0 in reply to Johann Eduardo Baader
    TI__Mastermind 19370 points
    Hi Johann,

    That is a pretty cool project you got on your hands. That sounds like a custom system board solution. I cannot provide that kind of service and can only direct you to look at our TI designs.

    -MZ