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Old 5th July 2012, 04:54 AM   #101
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Quote:
Originally Posted by DF96 View Post
Possibly. I think UK EEs generally extend 'linear' to include 'affine', as 'affine' is not a word which crops up often on EE courses here. 'Linear' is taken to mean 'no new frequency components in the output'.

Interestingly, the strict definition of linear excludes all sources (e.g. DC PSU, AC oscillators) so may be mathematically correct but perhaps unhelpful?

Strictly speaking, if there is no DC at the input but there is DC at the output, you have a new frequency component namely 0 Hz.

Anyway, an affine circuit can usually be split into a linear circuit and a bunch of independent sources. Superposition applies to the linear circuit, so you can turn on each independent source in turn and add the resulting output signals. I don't see what's the problem with that.
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Old 6th July 2012, 02:40 PM   #102
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Originally Posted by MarcelvdG View Post
-In the context of current feedback op-amps it applies to the exact same feedback configuration as normal voltage feedback (shunt at the output, series at the input), but with an op-amp having a low open-loop input impedance at its negative input.
IMHO this captures very poorly one fundamental property of CF op-amps, the closed loop BW to the first order does not change with gain. If the closed loop equations are rearranged to isolate the current into the inverting input things are very clear by considering that that current as what is fed back.
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Old 6th July 2012, 09:36 PM   #103
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Hi Scott,

I'm not denying that having a low open-loop input impedance at the negative input can have practical advantages, such as the one you just explained. All I'm saying is that three totally different feedback configurations are all referred to as "current feedback" because the term has been redefined at least twice. That doesn't make it any easier to understand what is meant.

Best regards,
Marcel
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Old 6th July 2012, 10:33 PM   #104
Ron E is offline Ron E  United States
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Originally Posted by jlsem View Post
I once read a technical paper by a well-known and respected Ph.D. who posts often on these forums and he didn't seem to know that a loose cite was not the same as to lose sight.
I read a book, possibly by the same phd, that reversed form and from so many times that it made your head spin.
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Old 8th July 2012, 10:39 PM   #105
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There's a serious problem here.

Quote:
The Streptomycin was invented by Selman Waksman and received patent number 2443485 on June 15, 1948.
When was the Streptomycin invented?

The patent given is on streptothricin not streptomycin.
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Old 8th July 2012, 11:26 PM   #106
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In the previous page I spotted "it's" where the the author meant "its".
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Old 9th July 2012, 12:27 AM   #107
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Quote:
Originally Posted by Ron E View Post
I read a book, possibly by the same phd, that reversed form and from so many times that it made your head spin.
Wehn you quickly raed mispyted txet olny frist and last lettres mettar. That's why ancient people used hieroglyphs to communicate meanings instead of sounds.
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Last edited by Wavebourn; 9th July 2012 at 12:29 AM.
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Old 9th July 2012, 06:29 PM   #108
popilin is offline popilin  Argentina
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Quote:
Originally Posted by jlsem View Post
I once read a technical paper by a well-known and respected Ph.D. who posts often on these forums and he didn't seem to know that a loose cite was not the same as to lose sight.
Tell us who is

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Old 9th July 2012, 09:15 PM   #109
Shaun is offline Shaun  South Africa
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Quote:
Originally Posted by Pano View Post
And the worst one of all, the eternal "And I" mistake. Seems that so few people in America can get that one right that it's going to have to change. Stupid, but that's the way it is. It seems we have a generation or two of English teachers that has failed us.

"And I" or "And me" - how hard can it be?
Let's explore that. When do you use the one or the other? I do believe that we have been taught to use "and I" at all costs.

The way I figure it out is use whatever you would have used had the other person(s) not been included.

Jack and I went to the shop. (I went to the shop)
The shopkeeper stared at Jack and me. (The shopkeeper stared at me)
Not Quickly he handed the goods to Jack and I. (Quickly he handed the goods to I)

Also, I've never been told this or read it anywhere (that I'm aware of), but I believe the correct form is to refer to yourself last (not "me and Jack").
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Old 9th July 2012, 09:34 PM   #110
DF96 is offline DF96  England
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Shaun and I agree on this.
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