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How to calculate the min. feedback resistor value in op-amps.
How to calculate the min. feedback resistor value in op-amps.
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Old 4th December 2019, 07:18 PM   #41
Mark Tillotson is online now Mark Tillotson
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Originally Posted by Piotr View Post
Thanks for the help everyone! I think the thread answers many questions with feedback in an interesting way. I think it's time to experiment a little. Maybe I will design some matrixes of resistors for the experimentation. Maybe I can also measure some THD's for low frequencies?

Yes, do that, but if the resistor is reasonably rated for the dissipation and metal film / thin film its going to be a small effect only at lowest frequencies. Using a 0.1% metal film with 25ppm tempco will nail the issue as temperature variations matter way less for a very-low tempco resistor.
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Old 4th December 2019, 08:15 PM   #42
Piotr is offline Piotr  Poland
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Originally Posted by Mark Tillotson View Post
Yes, do that, but if the resistor is reasonably rated for the dissipation and metal film / thin film its going to be a small effect only at lowest frequencies. Using a 0.1% metal film with 25ppm tempco will nail the issue as temperature variations matter way less for a very-low tempco resistor.

I have quite exspensive colection of X, Y, Z-foils ranging from 0.2 to 5PPM too. I'm not using them anymore anywhere. There is something wrong with them, with this foil construction. I think that normal 25PPM metal films are ok as you said.
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