Low Noise OP amp

[[email protected]]

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

Claude

 

[Phil Allison]

<[email protected]

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

** Application is ?



............ Phil

 

[martin griffith]

On 6 Nov 2005 23:02:01 -0800, in sci.electronics.design

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

Claude

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

 

[Ian Bell]

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

Claude

NE5532

Ian

 

[Phil Allison]

"Ian Bell"

NE5532

** That is two.

The fuckwit OP asked for one.




.......... Phil ;-)

 

[Noway2]

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.

 

[Winfield Hill]

Noway2 wrote...

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.

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.

 

[Ken Smith]

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

LT1028 or AD797

 

[martin griffith]

On Mon, 7 Nov 2005 15:08:50 +0000 (UTC), in sci.electronics.design

LT1028 or AD797

--

AD797 is not exactly low cost


martin

 

[John Miles]

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

 

[Don Lancaster]

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

Claude

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: [email protected]

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

 

[Don Lancaster]

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

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: [email protected]

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

 

[Ken Smith]

AD797 is not exactly low cost

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