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There is a simple (and above all quickly) way to calculate loop gain
(given a circuit without any further information)?
Thanks
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Author: John PopelishDate: 12:40 12-08-08
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silusilusilu@gmail.com wrote:
> There is a simple (and above all quickly) way to calculate loop gain
> (given a circuit without any further information)?
> Thanks
In general, no. Calculation of loop gain involves
everything in the loop, as well as the signal source and
load properties, though in some special cases, many of those
things can be ignored as insignificant.
--
Regards,
John Popelish
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Author: bgDate: 13:37 12-08-08
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silusilusilu@gmail.com wrote in message
<834e924f-308a-43e2-88a8-f07cdc63ea98@d45g2000hsc.googlegroups.com>...
>There is a simple (and above all quickly) way to calculate loop gain
>(given a circuit without any further information)?
>Thanks
The gain of an amplifier using feedback is given by --- A' = A / 1+BA
A' = Gain with feedback
A = Gain without feedback (open loop gain)
B = fraction of output fed back to the input (feedback factor)
bg
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Author: Tim WescottDate: 14:18 12-08-08
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silusilusilu@gmail.com wrote:
> There is a simple (and above all quickly) way to calculate loop gain
> (given a circuit without any further information)?
> Thanks
Without any further information than you gave? No.
If you're talking circuits, and you know the forward gain, and you know
the stage loading at the inputs and outputs, then you can calculate the
loop gain. It's a routine 3rd-year analog circuits exercise.
--
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html
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