[Fwd: Re: Op Amp pinouts was Re: [sdiy] more LM3900 stuff]

[Grant Richter]

Thanks Jim,

Do they have DACs with buffers that are linear enough to hit the  
theoretical limit?
That would have to be one trimmed up DAC (thinking old school).

Looking a the top of class AD1955 DAC with 110 dB S/N (110 dB / 6 dB  
per bit = 18 bits actual)
That would be around 4 microvolts of noise.

Nulling the fundamental method would require one good notch filter.

A single 24 bit LSB is something like 0.006 microvolt (1v pp).

I wonder about measuring or producing voltages that small and thermal  
noise.

What is the sound of a single electron flowing, and can we hear it?

(I know you can weigh a single electron, but can you measure a  
voltage difference accurately?)

On Jan 21, 2006, at 11:47 AM, James Patchell wrote:

> Actually, a perfect 24 bit sine wave would be 0.000006% distortion....
>
> You are right...that would be extremely difficult to measure...I  
> can think of several ways to do so...but it would be difficult...
>
> At 12:36 AM 1/21/2006 -0600, Grant Richter wrote:
>
>>> Have you looked at the OPA134?  Distortion = .00008%
>>
>> How do you even measure that? A 24 bit sine wave is 0.001% THD
>>
>
>         -Jim
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> http://www.oldcrows.net/~patchell
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