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#1 |
diyAudio Member
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OP07 model
Download page There will be more models when i have free time
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"In developing audio devices we can always find creative non standart solutions that will ensure the best sound" (с) S-Audio.Systems |
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#2 |
diyAudio Member
Join Date: Nov 2010
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#3 |
diyAudio Member
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Analog Devices offers an AD797 model that seems pretty accurate at least in terms of stability and dynamical response: License agreement for Spice Models | Analog Devices
The AD797 product page has a few other variant models, probably to handle slightly different expected offsets or other parameters. |
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#4 | |
diyAudio Member
Join Date: Nov 2010
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Quote:
I don't know if the AD model is acceptable or not but Nazar's paper shows that he has included many aspects that are often not correct. So I would be more confident of his work than the AD model. But the AD model may be fine, what have you checked? Best wishes David |
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#5 |
diyAudio Member
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Thx David.
Often datasheet data are far away from reality, thats why i measure open loop gain(with different loads), CMRR, open loop output impedance as most important parameters.
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"In developing audio devices we can always find creative non standart solutions that will ensure the best sound" (с) S-Audio.Systems |
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#6 |
diyAudio Member
Join Date: Nov 2010
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I checked the AD797 model and it sure doesn't match reality, or even the datasheet, on PSRR but at least it draws power from the rails
![]() I didn't notice temperature effects modelled in the net-list, but I didn't check this because it's mostly irrelevant for audio. It is curious that the AD797 is not included with LTSpice, since AD owns LTSpice. I assume Mike E. does not want to include components unless their models meet his standards, and that the LTspice staff don't yet have an acceptable model. In the meantime I have a micro-model that is usable. Thanks to Monte for the prompt to look at this. Best wishes David |
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#7 |
diyAudio Member
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I think the reason that the 797 is not in the LTspice distribution is because historically, only Linear components were installed. The merger between Analog and Linear is somewhat recent, and the Analog models are not of Linear origin. So, it's probably an artifact of all of the consolidation that's been happening.
I've never tested many aspects of the 797 model - thanks for doing that! I use LTspice primarily for stability and noise analysis, and also DC offset, so most 'fake' models using poles zeroes and pure gains with some pseudo-real IO components seem to work well enough. If I can get the circuit and surrounding passive component values to be at least somewhat plausible, then it can go into a PCB and be tested for real. |
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#8 |
diyAudio Member
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updated some models
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