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OPA211, funny/peculiar graph in datasheet

M

Martin Griffith

Jan 1, 1970
0
Fig 4 on page six, the unity gain thd looks a bit strange, for a +-
15v rail

Anyone tried one of these little beasts?


Martin
 
P

Phil Allison

Jan 1, 1970
0
"Martin Griffith"


Fig 4 on page six, the unity gain thd looks a bit strange, for a +-
15v rail


** 100% STALE NEWS !!!!!!!!!!!!


Phil Hobbs has done this piece of dumb trivia to death already.





........ Phil
 
M

Martin Griffith

Jan 1, 1970
0
"Martin Griffith"





** 100% STALE NEWS !!!!!!!!!!!!


Phil Hobbs has done this piece of dumb trivia to death already.





....... Phil
Not in this NG

sci.electronics.design

Your search - opa211 - did not match any documents


Martin
 
P

Phil Allison

Jan 1, 1970
0
"Martin Griffith"
"Phil Allison"
Not in this NG

sci.electronics.design



** Yes, right here on October 11 - you dim witted, PITA fool.

Your search - opa211 - did not match any documents


** No - your dumb search was 100% defective:

Path:
g2news2.google.com!news3.google.com!sn-xt-sjc-04!sn-xt-sjc-01!sn-post-sjc-01!supernews.com!corp.supernews.com!not-for-mail
From: Phil Hobbs <[email protected]>
Newsgroups: sci.electronics.design
Subject: "Maybe the universe has always been like this, but I've been too
wrapped up in myself to notice..."
Date: Thu, 11 Oct 2007 22:08:53 -0400
Organization: Posted via Supernews, http://www.supernews.com
Message-ID: <[email protected]>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.6)
Gecko/20070802 SeaMonkey/1.1.4
MIME-Version: 1.0
References: <[email protected]>
In-Reply-To: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-Complaints-To: [email protected]
Lines: 7

To all you op amp gurus: I posted a question and picture in
alt.binaries.schematics.electronic about weird THD behaviour in an
otherwise very nice op amp, the OPA211.

Cheers,

Phil Hobbs




** So - **** off

- you copycat TROLL.





...... Phil
 
M

Martin Griffith

Jan 1, 1970
0
"Martin Griffith"
"Phil Allison"



** Yes, right here on October 11 - you dim witted, PITA fool.




** No - your dumb search was 100% defective: snip s,

Phil Hobbs




** So - **** off

- you copycat TROLL.

..... Phil
I should have known that I should have searched for
"Maybe the universe has always been like this..."
rather than OPA211.

You too can be a bit of an idiot at times, just occasionally, not
really that often, really.......honest

BTWNot a single reply..... and it should be Mr. Phil Hobbs,





Martin
 
P

Phil Allison

Jan 1, 1970
0
"Martin Griffith"
"Phil Allison"


( snip copy of Phil Hobbs Oct 11 post on SED )


I should have known that I should have searched for
"Maybe the universe has always been like this..."
rather than OPA211.


** A search using "opa211" and specifying SED gets one hit - Phil Hobbs
post on Oct 11.

YOU stuffed up - fool.


really that often, really.......honest


** Piss off - wanker.



....... Phil
 
W

Winfield Hill

Jan 1, 1970
0
Martin said:
Phil Allison


I should have known that I should have searched for
"Maybe the universe has always been like this..."
rather than OPA211.

You too can be a bit of an idiot at times, just occasionally,
not really that often, really.......honest

BTW>>>Phil Hobbs has done this piece of dumb trivia to death already.

Not a single reply..... and it should be Mr. Phil Hobbs,

Yeah, I'd like to see what was said in that abse discussion. But
whatever it was, it seems clear that dasheet plot can't be relied
upon. And I have no idea, Martin, how your mild question set off
the bomb. OK, I went and looked; here's the done-to-death thread
(I know you've already read this, but others might like to see it,
and the abse threads aren't archived):


* Phil Hobbs:

Gents,

As I was helping someone with a TIA design this afternoon, I had
occasion to read the data sheet for the OPA211, which appears pretty
similar to the LT1028, except that it's a bit more stable and doesn't
come in a plastic DIP. It has a curve of THD+noise vs rms output
voltage that I found very odd (see attachment).

Everything goes swimmingly until the signal swing on the inputs
reaches
about 1V rms, and then it hits the wall. This is at a kilohertz, mind,
so it isn't an ordinary slew rate issue. It's also _way_ within the
CM range, because the plot specifies +- 15V supplies.

Since the problem surfaces at the same input voltage swing makes it
look like something in the input stage, but what in the world could
be as slow as that?

So what's up with this amp?


* John Larkin:

That graph makes no sense whatever.

If the numbers were different, I'd say that some input back-to-back
diodes were conducting... but not at 1 KHz. Also, fig 3 sort of
contradicts fig 4. 140 dB is an interesting number, too.

Is it an artifact of the test circuit, fig 41?

If you figure it out, let us know.


* Phil Allison:

** Nothing - Fig 4 is just plain wrong.

Read the text where it states THD < 0.0001% when G = 1 and
output level = 3 volts rms.


* Fred Bartoli:

It seems they nicely screwed the DS there.

Not only the G=+1 curve is, ahem, a bit off, but it seems the G=+11
curve could the G=+1 one: the G=11 curve shows 0.15ppm@3V, which is
the stated figure for the G=1 case.

They have a documentation feedback link in the page footer and I
just sent feedback. Let see what they say...
 
M

Martin Griffith

Jan 1, 1970
0
"Martin Griffith"


( snip copy of Phil Hobbs Oct 11 post on SED )





** A search using "opa211" and specifying SED gets one hit - Phil Hobbs
post on Oct 11.

YOU stuffed up - fool.





** Piss off - wanker.



...... Phil
Your search - opa211 hobbs - did not match any documents.

So you are blaming me that google is not exactly perfect?

Have a good night, bye, (and you use too much white space)


Martin
 
P

Phil Allison

Jan 1, 1970
0
"Martin Griffith"
" Phil Allison "
Your search - opa211 hobbs - did not match any documents.


** Works perfectly when I try it.

YOU are one dumb shithead.


So you are blaming me that google is not exactly perfect?


** Works perfectly when I try it.

YOU are one dumb shithead.

Have a good night, bye, (and you use too much white space)


** **** off - you BLOODY IDIOT .




........ Phil
 
M

Martin Griffith

Jan 1, 1970
0
On Fri, 19 Oct 2007 15:20:52 -0700, in sci.electronics.design Winfield

So - **** off
Yeah, I'd like to see what was said in that abse discussion. But
whatever it was, it seems clear that dasheet plot can't be relied
upon. And I have no idea, Martin, how your mild question set off
the bomb. OK, I went and looked; here's the done-to-death thread
(I know you've already read this, but others might like to see it,
and the abse threads aren't archived):


* Phil Hobbs:

Gents,

As I was helping someone with a TIA design this afternoon, I had
occasion to read the data sheet for the OPA211, which appears pretty
similar to the LT1028, except that it's a bit more stable and doesn't
come in a plastic DIP. It has a curve of THD+noise vs rms output
voltage that I found very odd (see attachment).

Everything goes swimmingly until the signal swing on the inputs
reaches
about 1V rms, and then it hits the wall. This is at a kilohertz, mind,
so it isn't an ordinary slew rate issue. It's also _way_ within the
CM range, because the plot specifies +- 15V supplies.

Since the problem surfaces at the same input voltage swing makes it
look like something in the input stage, but what in the world could
be as slow as that?

So what's up with this amp?


* John Larkin:

That graph makes no sense whatever.

If the numbers were different, I'd say that some input back-to-back
diodes were conducting... but not at 1 KHz. Also, fig 3 sort of
contradicts fig 4. 140 dB is an interesting number, too.

Is it an artifact of the test circuit, fig 41?

If you figure it out, let us know.


* Phil Allison:

** Nothing - Fig 4 is just plain wrong.

Read the text where it states THD < 0.0001% when G = 1 and
output level = 3 volts rms.


* Fred Bartoli:

It seems they nicely screwed the DS there.

Not only the G=+1 curve is, ahem, a bit off, but it seems the G=+11
curve could the G=+1 one: the G=11 curve shows 0.15ppm@3V, which is
the stated figure for the G=1 case.

They have a documentation feedback link in the page footer and I
just sent feedback. Let see what they say...
The f/b link is not for tech stuff, only wrong sort of font stuff




Thank you Win for the copy, none of that showed up on my NG reader or
in abse. I'll dig out LT1028 in the morrow

But should I apologise to Phil? This could be a first in SED?


Martin
 
P

Phil Allison

Jan 1, 1970
0
"Martin Griffith"
Thank you Win for the copy, none of that showed up on my NG reader or
in abse. I'll dig out LT1028 in the morrow

But should I apologise to Phil? This could be a first in SED?


** That is *very* hard to swallow.

Such an obscure issue, never mentioned on SED or ABSE prior to Phil Hobbs'
posts, somehow gets " independently discovered " by another poster only 7
days later.

Amazing ....




........ Phil
 
P

Phil Allison

Jan 1, 1970
0
"Martin Griffith"
"Phil Allison"

** This cretinous CUNTHEAD thinks it ever so clever to take words out of
context for effect.

Sure sign of a yet another moronic autistic.




** But a search on " opa211 hobbs " gets just one hit.

As does any similar search using GG's Advanced Search option - which is
how any sane person tries to find a post in their archive.

You still use too much white space.


** You still breath far too much air for something so utterly worthless.

Drop dead & save the planet from your CO2.




........ Phil
 
P

Phil Hobbs

Jan 1, 1970
0
Martin said:
On Fri, 19 Oct 2007 15:20:52 -0700, in sci.electronics.design Winfield

So - **** off
The f/b link is not for tech stuff, only wrong sort of font stuff




Thank you Win for the copy, none of that showed up on my NG reader or
in abse. I'll dig out LT1028 in the morrow

But should I apologise to Phil? This could be a first in SED?


Martin

Wow, my very own flame war.... Reminds me of my lottery experience...my
mum bought me a lottery ticket once that hit for $100--which makes me
the only person I know who's won something in a lottery without ever
having bought a ticket in his life. On the other hand, the $100 was
nicer. ;)

I suspect that Fred got it right--that the G=1 and G=11 curves are
backwards, the labelling is messed up (distortion vs Vin not Vout), and
the nonlinearity in each case is from the output banging into the rail.
It seems to happen near 10V rms, which is +-14V peak, not bad going
for +-15V supplies. I'm still not designing anything based on those
curves, though.

Cheers,

Phil Hobbs
 
P

Phil Hobbs

Jan 1, 1970
0
Martin said:
http://groups.google.es/groups/search?hl=en&q=phil+hobbs&qt_s=Search
did not return much, please take your meds. It's probably Google
redirecting .com to .es domains, and don't take sed so seriously.

You still use too much white space.


Martin

Actually, that's sort of interesting...the other Phil Hobbs who comes up
is an Australian troll who talks mostly about rugby...must be my
Antipodean self. I wonder if there's a Northern Hemisphere Phil Allison? ;)

Cheers,

Phil Hobbs
 
M

Martin Griffith

Jan 1, 1970
0
"Martin Griffith"



** That is *very* hard to swallow.

Such an obscure issue, never mentioned on SED or ABSE prior to Phil Hobbs'
posts, somehow gets " independently discovered " by another poster only 7
days later.

Amazing ....



....... Phil
Sign up to my server, 500$US or 10€ a year, it's just not there,90 day
retention, AFAIR, just one message, the original, by Mr. P.H, and I
could not find it through google.es, so can we please call this
sillyness to an end.

And the idea that *only* 2 english speaking people notice a problem in
the same datasheet, independantly, and queried it, within a week is
not unknown. I should have thought it would be more.

I'm more annoyed about the guys who produced the datasheet in the
first place for not spotting it, and geting us into this stupid rut


Martin
 
P

Phil Allison

Jan 1, 1970
0
"Martin Griffith"
Sign up to my server, 500$US or 10? a year, it's just not there,90 day
retention, AFAIR, just one message, the original, by Mr. P.H, and I
could not find it through google.es,


** But a GG's search on " opa211 hobbs " gets just one hit.

As does any similar search using GG's Advanced Groups Search option -
which is
how any sane person tries to find a post in their archive.

YOU ARE A TOTAL ASS !!!!!!!

so can we please call this sillyness to an end.


** The one prolonging the agony is YOU


- YOU ASD FUCKED TOTAL IDIOT !!!!!!!

And the idea that *only* 2 english speaking people notice a problem in
the same datasheet, independantly, and queried it, within a week is
not unknown.


** So yo have ZERO comprehension of probability.

As well as every other damn thing.


I should have thought it would be more.


** With what ??

That pointy lump of wood on top of your fat neck ???



........ Phil
 
J

John Popelish

Jan 1, 1970
0
Winfield said:
Yeah, I'd like to see what was said in that abse discussion. But
whatever it was, it seems clear that dasheet plot can't be relied
upon. And I have no idea, Martin, how your mild question set off
the bomb. OK, I went and looked; here's the done-to-death thread
(I know you've already read this, but others might like to see it,
and the abse threads aren't archived):


* Phil Hobbs:

Gents,

As I was helping someone with a TIA design this afternoon, I had
occasion to read the data sheet for the OPA211, which appears pretty
similar to the LT1028, except that it's a bit more stable and doesn't
come in a plastic DIP. It has a curve of THD+noise vs rms output
voltage that I found very odd (see attachment).

Everything goes swimmingly until the signal swing on the inputs
reaches
about 1V rms, and then it hits the wall. This is at a kilohertz, mind,
so it isn't an ordinary slew rate issue. It's also _way_ within the
CM range, because the plot specifies +- 15V supplies.

Since the problem surfaces at the same input voltage swing makes it
look like something in the input stage, but what in the world could
be as slow as that?

So what's up with this amp?


* John Larkin:

That graph makes no sense whatever.

If the numbers were different, I'd say that some input back-to-back
diodes were conducting... but not at 1 KHz. Also, fig 3 sort of
contradicts fig 4. 140 dB is an interesting number, too.

Is it an artifact of the test circuit, fig 41?

If you figure it out, let us know.


* Phil Allison:

** Nothing - Fig 4 is just plain wrong.

Read the text where it states THD < 0.0001% when G = 1 and
output level = 3 volts rms.


* Fred Bartoli:

It seems they nicely screwed the DS there.

Not only the G=+1 curve is, ahem, a bit off, but it seems the G=+11
curve could the G=+1 one: the G=11 curve shows 0.15ppm@3V, which is
the stated figure for the G=1 case.

They have a documentation feedback link in the page footer and I
just sent feedback. Let see what they say...

My guess is that the typo is the +-15 volt supply
specification. If the amp is powered by +-2.5 volts, the
narrow common mode range would explain the curves.
 
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