3 ms·

I recently bought some FPAAs from Anadigm, specifically the 3.3V version: AN231E04-E2-QFNSP Interestingly they use a switched-capacitor design, which means you

I recently bought some FPAAs from Anadigm, specifically the 3.3V version: AN231E04-E2-QFNSP Interestingly they use a switched-capacitor design, which means you can only input signals lower than the clock frequency used for switching the caps. I had a look for continuous-time FPAAs but couldn't find any. My goal is simply to make a guitar FX pedal with them, as they can alter gain, perform filtering such band-pass etc. Potentially I could see it having lower latency than DSP, if anyone knows more about that, I'd be very curious.

OnACoffeeBreak 12y ago
This may be completely not what you're looking for, but take a look at Cypress' PSOC devices. They have an interesting mix of analog and digital programmable blocks.
alecdibble 12y ago
If you are interested, I did some research on extremely fast, lower power, and low noise filtering using FPGAs or CPLDs.
- reportingsjr 12y ago
  I am interested if you are willing to share!
  - alecdibble 12y ago
    https://news.ycombinator.com/item?id=8592292 https://news.ycombinator.com/item?id=8592292 Link to my reply. :)
- deutronium 12y ago
  Sure, that sounds cool! (I've got a cheap FPGA dev board that's got an ADC/DAC on, that I wouldn't mind putting to good use)
  - alecdibble 12y ago
    Most of the research work was targeting a specific development paltform, so I don't have good instructions for doing it generally. Here is the paper we based our research off of: http://www.eecg.toronto.edu/~johns/ece1371/papers/1993_lewis.pdf http://www.eecg.toronto.edu/~johns/ece1371/papers/1993_lewis... Here is my presentation poster which should explain the motivation and theory a little more clearly than the paper: https://www.ece.ucsb.edu/academics/undergrad/capstone/event-2012/presentations/flexSD-poster.pdf https://www.ece.ucsb.edu/academics/undergrad/capstone/event-... I graduated before we got it releasable, and haven't had much time with my job to finish up the project. I don't have more time to add to this explanation, but if you want more info or implementation help, feel free to email me: alecdibble at gmail dot com.
sitkack 12y ago
You can do digital control of analog circuits, PGA, digital pots, etc. Just had a fun idea, you could use an LED to charge a rotating photoluminescent medium and then read out the intensity some rotation angle later, it be like a magnetic tape loop but have its own decay as well. Modulate the speed of rotation, the read angle and the intensity of the write. http://www.identi-tape.com/photolum-tape.htm http://www.identi-tape.com/photolum-tape.htm on the edge of a turn table
- deutronium 12y ago
  Heh, that's a really cool idea!

OnACoffeeBreak 12y ago

This may be completely not what you're looking for, but take a look at Cypress' PSOC devices. They have an interesting mix of analog and digital programmable blocks.

alecdibble 12y ago

If you are interested, I did some research on extremely fast, lower power, and low noise filtering using FPGAs or CPLDs.

reportingsjr 12y ago
I am interested if you are willing to share!
- alecdibble 12y ago
  https://news.ycombinator.com/item?id=8592292 https://news.ycombinator.com/item?id=8592292 Link to my reply. :)
deutronium 12y ago
Sure, that sounds cool! (I've got a cheap FPGA dev board that's got an ADC/DAC on, that I wouldn't mind putting to good use)
- alecdibble 12y ago
  Most of the research work was targeting a specific development paltform, so I don't have good instructions for doing it generally. Here is the paper we based our research off of: http://www.eecg.toronto.edu/~johns/ece1371/papers/1993_lewis.pdf http://www.eecg.toronto.edu/~johns/ece1371/papers/1993_lewis... Here is my presentation poster which should explain the motivation and theory a little more clearly than the paper: https://www.ece.ucsb.edu/academics/undergrad/capstone/event-2012/presentations/flexSD-poster.pdf https://www.ece.ucsb.edu/academics/undergrad/capstone/event-... I graduated before we got it releasable, and haven't had much time with my job to finish up the project. I don't have more time to add to this explanation, but if you want more info or implementation help, feel free to email me: alecdibble at gmail dot com.

sitkack 12y ago

You can do digital control of analog circuits, PGA, digital pots, etc. Just had a fun idea, you could use an LED to charge a rotating photoluminescent medium and then read out the intensity some rotation angle later, it be like a magnetic tape loop but have its own decay as well. Modulate the speed of rotation, the read angle and the intensity of the write. http://www.identi-tape.com/photolum-tape.htm http://www.identi-tape.com/photolum-tape.htm on the edge of a turn table

deutronium 12y ago
Heh, that's a really cool idea!