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How will Avol affect the performance of an AD circuit?

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powersys

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Let's say the Open Loop Gain (AVOL) of two op-amps is 10V/mV and 10000 V/mV, respectively. The one with better performance will be used to build the signal-conditioning circuit (e.g. buffering, low-pass filter, etc.) for an analog-to-digital converter (ADC). How will the AVOL affect the performance of an AD circuit? Which op-amp should I choose, the one with higher or lower AVOL?

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If you can find an opamp with 140 dB open-loop gain - and if all the other parameters meet your requirements (stability properties, slew rate, price,...) - why not choose the best one?
However, I am afraid you will not succeed. Therefore, select the midth with an Avol of approx. 80 or 100 dB.
It's good enough for buffers, filters, etc. for frequencies up to (1/100...1/10) of the transit frequency, depending on the required gain with feedback.
 

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