PSN-L Email List Message
Subject: RE: AD7142 ?
From: "James Hannon" jmhannon@.........
Date: Thu, 13 Apr 2006 13:50:15 -0500
I basically agree with your analysis of the delays needed. The functions needed for implementing a PID feedback loop can all be done in one sample time. So if the sample rate is high enough it should work fine. If you can balance a scooter http://www.tlb.org/scooter.html with 8 bit microcontrollers I see no reason why a DSP could not close a loop on a siesmograph with a natural period around 1 second or even 0.1 second.
---------- Original Message ----------------------------------
From: Brett Nordgren
Date: Thu, 13 Apr 2006 14:29:25 -0400
>I second Jack's concern. I'd pretty much written off the possiblilty of
>doing DSP feedback at anything but very low frequency. I'd calculate that
>an absolute maximum for the DSP delay (assuming 37Hz gain crossover) would
>be about 13ms. 7ms or a bit more would probably be quite tolerable. Is
>there any way to do that?
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