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Old 3rd May 2009, 03:16 AM   #1
jetbat is offline jetbat  United States
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Default Unity Gain op amp circuit?

Hi, I was wondering if this op amp is running at unity gain? I know with just the two 22k resistors it is. But with 3, I don't know. Anyone have some insight?

Thanks
Scott
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Old 3rd May 2009, 03:50 AM   #2
kaos is offline kaos  United States
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It’s an inverting summing amp with two inputs (it basically adds the two signals together and inverts). For inputs of +1V & +1V you get –2V at the output. For inputs of +1V,-1V you get 0V at the output, +1V & 0V = -1V, and so forth.
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Old 3rd May 2009, 04:00 PM   #3
AndrewT is offline AndrewT  Scotland
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Yes, it's a unity gain opamp.

The gain at each input is set by the feedback resistor divided by the input resistor.
In both the inputs, the gain is 22/22 = 1

As Kaos has said, the opamp ADDs all the input signals. You can put on as many as you like
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regards Andrew T.
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Old 5th May 2009, 12:29 AM   #4
jetbat is offline jetbat  United States
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Thanks, I understand now.
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