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> What Is This Symbol?
hacker3141
Posted: August 30, 2011 12:21 am
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I've been trying to read a schematic, and have come across this symbol.

user posted image

I know the one to the left is an inverter, but what is the one to the right? The circle is in a different position and I'm not sure if it's still an inverter or something else altogether.
Thanks for the help.


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MacFromOK
Posted: August 30, 2011 01:00 am
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It's just another symbol for an inverter. beer.gif

http://www.allaboutcircuits.com/vol_4/chpt_3/1.html


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hacker3141
Posted: August 30, 2011 01:04 am
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Ah, okay. I thought that was the case but I wondered why they chose that specific layout as it doesn't make much to invert a signal and then invert it again. Thanks!


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MacFromOK
Posted: August 30, 2011 01:20 am
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Glad to help. I didn't know what it was either btw (hence the reference). biggrin.gif


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kl27x
Posted: August 30, 2011 08:23 am
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My guess is the signal could be double inverted as a buffer and/or voltage follower (current amplifier) and/or voltage bump up/down. Or there was a leftover inverter on an IC, and it made signal routing easier. Or the guy just had a brain fart.
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Village Idiot
Posted: August 30, 2011 10:57 am
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Likely for buffering or else to ensure correct propagation delay.

(Edit: This was in reply to the question of why the second inverter is present, not the question about the symbol.)
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Gorgon
Posted: August 30, 2011 03:34 pm
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It's just made to make the schematics easier to read. The ring indicates inversion, and two on the same node cancel out.

TOK wink.gif


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tekwiz
Posted: August 30, 2011 07:25 pm
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QUOTE
Ah, okay. I thought that was the case but I wondered why they chose that specific layout as it doesn't make much to invert a signal and then invert it again. Thanks!


Sure it makes sense, as there's a connection to other circuitry between the inversion stages. This implies that the inverted signal is required elsewhere.
As mentioned, inversion stages can also be used as buffers, to clean up a signal or prevent interaction between stages. wink.gif


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kl27x
Posted: August 30, 2011 09:10 pm
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QUOTE
It's just made to make the schematics easier to read. The ring indicates inversion, and two on the same node cancel out.

QUOTE
Sure it makes sense, as there's a connection to other circuitry between the inversion stages. This implies that the inverted signal is required elsewhere.

I think the question is why, as opposed to this. Give the OP a little credit. smile.gif
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GPG
Posted: August 31, 2011 02:03 am
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An 'and' gate is an 'or' gate with inverted inputs, and vice-versa, an older convention often carried over to an inverter at the drawing level.
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