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The Signal Op Amps… G=1 stable & decompensated

Apr 8, 2013

You have voted. Unity-gain-stable op amps won in a landslide—they’re far more popular than decompensated op amps. What’s this all about?

Click Here to read on EDN Magazine site.

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Bonnie Baker - WEBENCH Design Center over 10 years ago

Mengchi Chen ,

About using uncompenstated op amps with current out DACs, I took some time to write an article about that a few years ago (EDN, 2007, July, "Transimpedance strikes again", www.edn.com/.../Transimpedance-strikes-again-Current-to-voltage-conversion-with-MDACs). In that article I summarized that actually your noise gain, that deterimined stablity, is dependant on your feedback capacitance and the output capacitance of your DAC. This is very hard to balance, as the output capacitance and resistance of a DAC changes, dependant on the DAC input code (or output analog current source). Please read the article.
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Bonnie Baker - WEBENCH Design Center over 10 years ago

Mengchi Chen ,

About using uncompenstated op amps with current out DACs, I took some time to write an article about that a few years ago (EDN, 2007, July, "Transimpedance strikes again", www.edn.com/.../Transimpedance-strikes-again-Current-to-voltage-conversion-with-MDACs). In that article I summarized that actually your noise gain, that deterimined stablity, is dependant on your feedback capacitance and the output capacitance of your DAC. This is very hard to balance, as the output capacitance and resistance of a DAC changes, dependant on the DAC input code (or output analog current source). Please read the article.
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