0V reference

The intended accuracy and drift ? :-)

Rene

Thanks for the reply, Rene.

100% accuracy, 0% drift - It is critical that this is a 0.0000V reference. FB

I was told that a resistor to ground would do it, with a capacitor to 0V to stabilise the voltage. What values of resistor and capacitor would you recommend for 1 amp? Fred

For your quoted 0.0000V reference at 1A the resistor needs to be

0V relative to what?

0.0000V is trivial. 0.0000000 is more difficult.

Best regards, Spehro Pefhany

--
"it\'s the network..."                          "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

Hello Spehro,

Nah, replace the bolts with marine grade stainless and give it some more torque :-)

Regards, Joerg

Nah, stainless is a bad conductor, worse then steel. Copper is what you need ;) If its a audio application, you will need a 101% super-duper-ultra-OFC-OMG-WTCF-STFU plated bolt made from 50 year old

5-times refined silver from a certain mine in england that was processed by a tibetian monk.Othwerise it will sound rough, cold, shady and dark. ;)

--
Are you one of them? ;)

Even marine-grade stainless steel is stainless by virtue of a thin and cohernet layer of chromium oxide - I don't know which one - which has an appreciable electrical resistance.

My conductivity meter stopped using stainless steel electrodes - a bad idea that I'd inherited - at the point where I could prove that the oxide film had an appreciable electrical resistance by changing that resistance by exposing the film to 2% aqueous sodium hydroxide (whose conductivity the meter had to monitor, along with that of the tap water that washed it away).

--
Bill Sloman, Nijmegen

would -273.16 degrees C help?

martin

Lots of unpleasant ways for 100nV to crop up..

Best regards, Spehro Pefhany

--
"it\'s the network..."                          "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

You left out "Dank" ;-)

--
Service to my country? Been there, Done that, and I\'ve got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

Well, guys, this was meant as a joke...

Ok then, how 'bout a nice thick gold plating on everything? Of course only gold mined from a particular mine here in California in 1850.

Regards, Joerg

A reference has never 1 amp. References just supply the voltage, not power. Lookup "supply" or "voltage regulator"

Rene

;-)

How pure? Gold-copper doesn't have much thermocouple voltage, but a couple tenths of a degree C would be enough to swamp 100nV. Galvanic action might be possible too.

Of course the advantage of selling such a 'reference' to unsophisticated customers would be that few would be able to test it sufficiently accurately to complain.

Best regards, Spehro Pefhany

--
"it\'s the network..."                          "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

In that case the reference has appreciable resistance / impedance.

An ideal reference would have zero impedance and laugh at an Amp.

Graham

You've been looking at some schematics that have 0Vref on them haven't you ? ( blushes )

Graham

An ideal reference yes, but actual references only supply a few mA at close to zero ohms

Rene