Mitch,are you referring to startup behaviour,
like Bob Smither suggests?
Just now I was trying to imagine the startup
(it's too late for firing up ltspice, I have to sleep :) )
and I was thinking that on startup both inputs
are zero and output can take both ways: go down (remain approx zero)
or go up, depending on input offset.
Is this correct?
If so what determines the correct startup
of the circuit?
Until the output diode is not forward biased
the opamp has no feedback and the output should amplify
any input noise some million times (open loop gain),
so I imagine that is only waiting that the noise on
inputs will steer the output the rignt way to forward-bias
the diode and start the reference.
Does all this makes sense?
Fabio.
Mitch Van Ochten <[email protected]> ha scritto:
Positive input voltage range for an LT1006 is typically 1.2V below
the positive rail.
mitch
----- Original Message ----- From: "Fabio Eboli" <[email protected]>
To: <[email protected]>
Sent: Wednesday, November 07, 2012 7:02 PM
Subject: [volt-nuts] LTZ1000 reference appnote question
Hello, in this thread on eevblog:
http://www.eevblog.com/forum/projects-designs-and-technical-stuff/does-anyone-know-what-this-diode-is-for/
a guy named DiligentMinds.com asked the question
about why there is a 1N4148 diode on the output of
the opamp in the LTZ1000 reference circuit, the one
designed by Jim William in the appnotes, that can
also be seen on the first page of the datasheet:
http://cds.linear.com/images/product/1203_app_1.JPG
Now I'm curious,
anybody knows the answer?
Thanks,
Fabio.
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