Signal Generator: Program Frequency Range of Noise Source

[davidparent]

I am using the ADALM2000 to teach lower-division undergrads how to authentically participate in a research program. The project is a stochastic resonance investigation with a Schmitt trigger. A noise source input into one power of the smitt trigger and a small sin is sent into the other port. The students make S/N measurements.

I would like to be able to control the frequency range of the noise source. Right now the noise source is too fast to trigger the Schmitt trigger.

What I do now is record the noise source to a file and read it back and change the sample rate. This is pretty good but sometimes the signal repeating shows up in the spectrum analyzer. It would be great to be able to set it up and let it run.

[adisuciu]

#1139

The noise in the signal generator is computed once and then cyclically sent out the buffer. It is not real noise. We will implement streaming mode for the DAC which would change the noise density, but it would be limited to lower sample rates because data is continously sent across the USB link. Our tests show that we can stream at about 750ksps.

-Adrian