Re: Anybody using Anadigm FPAA's?

From: Robert Lacoste (see-www-alciom-com-for-email-adress)
Date: 02/09/05 

Date: Wed, 9 Feb 2005 18:46:01 +0100

"Dan K" <danielgkNOSPAM@voomtech.com> a écrit dans le message de news:
420a336d$0$29482$a1866201@visi.com...
> FPAA is a "field programmable analog array". I've been thinking of buying
> their development board ($200) to play around with. Their subwoofer
> filter
> sounds like something I would like to try. I'm not real proficient with
> analog, but I gather that might be one of the advantages to FPAA's as it
> looks like their s/w can handle a lot of the analog pit-falls for you.
> Anybody got any experience? good/bad? easy/hard? comments?

Anadigm's FPAA are really exciting components. Easy development tools,
reasonnably good analog performances. For example I implemented with them a
10KHz low pass filter, with a measured -30dB point at 12.9KHz compared to
the theoretical 13KHz, and 0,08dB stability in the passband. The isolation
in the stop band was measured as high as -80dB at 2xFc. Not bad... I also
tried a 10KHz narrow bandpass filter, and got -30dB at 9,3KHz and 10,8KHz.
Notch filters are also easy to build.

However for "simple" fixed filters these components are not the best choice
: why not just using standard switch cap filters or even a pair of
operationnal amplifiers ? However as soon as you need any form of
reconfiguration of the analog blocs, or a more complex function (like captor
linearisation) then these components are really exciting. And I don't say
that because I am a certified AnadigmPro consultant ;+)

Friendly yours, 

-- 
Robert Lacoste
ALCIOM - The mixed signal experts
www.alciom.com
To contact us, thanks to click on the antispam link below :
http://www.cerbermail.com/?dCSHUxvwpw

Relevant Pages

  • Re: Is this true regarding digital recording?
    ... This is no more or less true about digital than it is about analog. ... Most recording processes upset phase relationships. ... I have a Sony PCM-F1 with phase-compensated Apogee filters. ... the group delay of a single-order highpass 20 Hz analog highpass ...
    (rec.audio.pro)
  • Re: Optical CRT eavesdropping from diffusely reflected light
    ... >|> Is that the best picture in that pdf that you got? ... >|> This sort of LF error can be compensated a lot by RC filters. ... Any combination of analog filters can ... > - even more acurate modeling of the phosphor impulse response ...
    (sci.crypt)
  • Re: Arny ! Why dont you STFU ?
    ... Modern converters aren't brick wall filtered though. ... Modern converters aren't brick-wall filtered with analog ... the digital filters on a good modern DVD player. ... delay steps and filter parameters in the digital domain, ...
    (rec.audio.opinion)
  • Re: Alternate approach(s) to introducing FIR and IIR filters
    ... I did a quick search on "analog transversal filter" and, like you, ... old days they used to build filters out of analog delay lines. ... impulse response response. ... Dual output busses can handle both positive and negative coefficients, but AFIK, it's not don in practice. ...
    (comp.dsp)
  • Re: Modem/router and Filter Location
    ... What you're suggesting should work - as long as you put filters in all other ... sockets which have analog equipment ... A better solution would be to fit a filtered faceplate to the master socket, ... and run a digital extension from it to your loft. ...
    (uk.telecom.broadband)