| Author |
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Guest
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 Posted:
Mon Nov 07, 2005 9:35 am Post subject:
Low Noise OP amp |
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What is your suggestion for a moderate cost low noise op amplifier ?
Claude
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Phil Allison
Guest
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| Posted:
Mon Nov 07, 2005 9:35 am Post subject:
Re: Low Noise OP amp |
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<r31dmaeu@unibw.de
| Quote: |
What is your suggestion for a moderate cost low noise op amplifier ?
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** Application is ?
............ Phil |
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Ken Smith
Guest
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| Posted:
Mon Nov 07, 2005 3:08 pm Post subject:
Re: Low Noise OP amp |
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In article <1131345891.395082.226210@g14g2000cwa.googlegroups.com>,
<r31dmaeu@unibw.de> wrote:
| Quote: | What is your suggestion for a moderate cost low noise op amplifier ?
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LT1028 or AD797
--
--
kensmith@rahul.net forging knowledge
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Ian Bell
Guest
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| Posted:
Mon Nov 07, 2005 4:50 pm Post subject:
Re: Low Noise OP amp |
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r31dmaeu@unibw.de wrote:
| Quote: | What is your suggestion for a moderate cost low noise op amplifier ?
Claude
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NE5532
Ian |
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Winfield Hill
Guest
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| Posted:
Mon Nov 07, 2005 5:35 pm Post subject:
Re: Low Noise OP amp |
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Noway2 wrote...
| Quote: |
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.
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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.
--
Thanks,
- Win |
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Noway2
Guest
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| Posted:
Mon Nov 07, 2005 5:35 pm Post subject:
Re: Low Noise OP amp |
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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. |
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John Miles
Guest
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| Posted:
Tue Nov 08, 2005 12:43 am Post subject:
Re: Low Noise OP amp |
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In article <1131345891.395082.226210@g14g2000cwa.googlegroups.com>,
r31dmaeu@unibw.de says...
| Quote: | What is your suggestion for a moderate cost low noise op amplifier ?
Claude
|
My current favorite (well, voltage favorite) is the LT1677. A rail-to-
rail OP27.
-- jm
------------------------------------------------------
http://www.qsl.net/ke5fx
Note: My E-mail address has been altered to avoid spam
------------------------------------------------------ |
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Don Lancaster
Guest
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| Posted:
Tue Nov 08, 2005 1:35 am Post subject:
Re: Low Noise OP amp |
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r31dmaeu@unibw.de wrote:
| Quote: | What is your suggestion for a moderate cost low noise op amplifier ?
Claude
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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: don@tinaja.com
Please visit my GURU's LAIR web site at http://www.tinaja.com |
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