Drv 134pa Strange frequency response
« on: June 05, 2019, 12:02:45 PM »

I recently tested a drv134pa inside a pcb i designed. I injected an audio test signal in its input pin, with gnd very very close, and measured the output jack to make a measurement into the pc audio interface  with True Audio True RTA.

And the result, is what i have attached...¡ a notch filter! ¿Is that normal?

In other occasions measuring AC coupled (input and output)  inverting stages, with this software, what i get is a Ramp.
I know that AC coupled inverting stages are integrators, and integrators generate ramps, as output.

That said, and back to the drv134, i really don't know what to think about this measurement. Maybe is in the way this software works...

Finally, if i measure other stages with the balanced line driver ( a line input+fader+line driver for example) i get a typical frequency response graph.

Any comment is wellcome!
Thank you very much!
Jay x.


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