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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Op amp output coupled with capacitor or direct drive output withn offset adjustment posted by legarem on January 23, 2006 at 14:07:22:
Drift is why. A circuit that is adjusted for zero offest at a given temperature may not maintain zero offset as temperature changes. The pots used to trim the offset have a temperature coefficient as do the resistors in the circuit as does the op amp itself. If you zero out the DC when everything is warmed up it won't be zeroed out cold (or vice-versa).By using a cap the designer can be assured he won't have DC in the output regardless of temp changes. And using a cap is cheaper and easier to implement than a servo circuit (which have other concerns as well...).
So it isn't always just cost.
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Follow Ups
- Re: Op amp output coupled with capacitor or direct drive output withn offset adjustment - Jim McShane 20:04:26 01/23/06 (1)
- Yeah and dealing with drift adds cost - Tweekeng 20:44:39 01/23/06 (0)
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