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Further thoughts on the opamp

Posted by RJM (A) on December 5, 2002 at 01:40:48

In Reply to: A current input MC phono preamplifier project posted by RJM on December 4, 2002 at 06:37:01:

Based on a 90 dB gain version, with a 60 dB gain input stage (75 dB version with 45 dB input stage in brackets)

1. Low DC offset. Input offset voltage below 10 uV (100 uV)

2. High GBWP. Above 200 MHz (20 Mhz)

3. High PSRR.

4. Low distortion into 600 ohm loads.

5. Low voltage noise. Below 10 nV/rootHz, the lower the better.

That's sets the bar pretty high. I'm sitting here looking at the AD797 datasheet and it's the only one I have left that passes all the above. I know its a pain to use and hard to get to sound good, so I'm open to suggestions, but dang it the AD797 seems to have been born for this circuit.

rjm

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