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Summing Amplifier with non-ideal op-amp

Doing any adjustment that relies on OpAmp parametrics, and them staying stable, is plain IGNORANT.

...Jim Thompson

--
|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
|  Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
|  Phoenix, Arizona            Voice:(480)460-2350  |             |
|  E-mail Address at Website     Fax:(480)460-2142  |  Brass Rat  |
|       http://www.analog-innovations.com           |    1962     |
             
I love to cook with wine.      Sometimes I even put it in the food.
Reply to
Jim Thompson
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Which reminds me... sometimes bypassing the summing node to ground can improve system noise problems.

...Jim Thompson

--
|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
|  Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
|  Phoenix, Arizona            Voice:(480)460-2350  |             |
|  E-mail Address at Website     Fax:(480)460-2142  |  Brass Rat  |
|       http://www.analog-innovations.com           |    1962     |
             
I love to cook with wine.      Sometimes I even put it in the food.
Reply to
Jim Thompson

Depends ;-)

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

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| 1962 | I love to cook with wine. Sometimes I even put it in the food.

Reply to
Jim Thompson

Putting shunt elements across the two inputs is a sometimes used method to improve/alter the stability of an opamp, by changing its effective open loop gain and phase response. I have seen it used to turn a comparator into an opamp. It doesn't affect the slew rate, which doesn't involve the input gain stage.

--
John Popelish
Reply to
John Popelish

p i m p r o v e o b l e m

Holy Moley, he's right!

John

Reply to
John Larkin

When you "improve a problem" do you make it better or worse?

Jim

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Reply to
<rp0000003356

I read in sci.electronics.design that rp0000003356@127.0.0.1 wrote (in ) about 'Summing Amplifier with non-ideal op- amp', on Thu, 10 Mar 2005:

Neither; the words are orthogonal.

--
Regards, John Woodgate, OOO - Own Opinions Only. 
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
Reply to
John Woodgate

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