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Low Noise OP amp

Discussion in 'Electronic Design' started by [email protected], Nov 7, 2005.

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  1. Guest

    What is your suggestion for a moderate cost low noise op amplifier ?

    Claude
     
  2. Phil Allison

    Phil Allison Guest

    <
    ** Application is ?



    ............ Phil
     
  3. On 6 Nov 2005 23:02:01 -0800, in sci.electronics.design
    It depends, you havent stated source impedance, frequency range etc.
    but if it is for audio, NE5534 is cheap and good

    see a rundown here
    http://www.dself.dsl.pipex.com/ampins/webbop/opamp.htm


    martin
     
  4. Ian Bell

    Ian Bell Guest

    NE5532

    Ian
     
  5. Phil Allison

    Phil Allison Guest

    "Ian Bell"

    ** That is two.

    The fuckwit OP asked for one.




    .......... Phil ;-)
     
  6. Noway2

    Noway2 Guest

    Low noise and moderate cost are subjective terms. What constitutes low
    noise for your application? Are you looking for voltage offsets in the
    microvolt or milivolt range, current offsets in the pico amp, nanoamp,
    or miliamp range? What is the required bandwidth and slew rate? These
    are some of the factor that need to be considered in proper part
    selection.

    Unless you have a solid understanding of your noise (margin)
    requirments, it is impossible not only to suggest a part that will meet
    your needs, but for you to be sure that it does. Often times, the
    critical parameters depend on the circuit implementation. The only
    likely effect of simply inserting precision components without this
    understanding is an increase in cost without a performance gain.
     
  7. Noway2 wrote...
    Right. For example, the NE5532A mentioned in this thread is a
    classic "quiet", "low-distortion" opamp, but for some uses it's
    very noisy (8nV and 2.7pA per root Hz at 30Hz), and for other
    uses it's not a low-distortion opamp. Many wouldn't consider it
    a low-cost opamp, 84-cents for TI's miniDIP version at Digikey.
     
  8. Ken Smith

    Ken Smith Guest

    LT1028 or AD797
     
  9. On Mon, 7 Nov 2005 15:08:50 +0000 (UTC), in sci.electronics.design
    AD797 is not exactly low cost


    martin
     
  10. John Miles

    John Miles Guest

    My current favorite (well, voltage favorite) is the LT1677. A rail-to-
    rail OP27.

    -- jm
     
  11. The answer depends entirely on the bandwidth, the frequency, and the
    source impedance.

    But Linear Systems is a good starting place.

    --
    Many thanks,

    Don Lancaster voice phone: (928)428-4073
    Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
    rss: http://www.tinaja.com/whtnu.xml email:

    Please visit my GURU's LAIR web site at http://www.tinaja.com
     
  12. Most people asking this question are starting with an input whose signal
    to noise ratio is already terrible.

    For these folks, a low noise op amp makes no difference whatsoever.

    --
    Many thanks,

    Don Lancaster voice phone: (928)428-4073
    Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
    rss: http://www.tinaja.com/whtnu.xml email:

    Please visit my GURU's LAIR web site at http://www.tinaja.com
     
  13. Ken Smith

    Ken Smith Guest

    True but the OP was after a "moderate cost" one. Since "moderate" isn't
    well defined, I thought it worth suggesting the AD797
     
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