Summing Amplifier with non-ideal op-amp

Which reminds me... sometimes bypassing the summing node to ground can improve system noise problems.

...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 | |

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.

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

Holy Moley, he's right!

John

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

Jim

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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.