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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: It is not a question of "too much gain" posted by clifff on January 19, 2007 at 06:35:04:
marchewd, the absolute gain of an amplifier is a function of the feedback network precision, not the open loop gain of the opamp. A unity gain opamp's feedback resistor must be of such a value as to ensure that 1 vote in gives you 1 volt out. The open loop gain may be the same as a higher gain device, but in circuit, unity means 1 in, 1 out and that is the absolute gain. A gain of 5 means that you use a feedback resistor value which gives you an output gain of 5 to 1 in. If you can use an OPA627, you are not going to get ringing with an OPA637, but you would have to change out the feedback resistor and likely make other circuit mods to use it. Do not confuse open loop gain and absolute gain as the responder here has, they are not the same thing at all.
Best Regards,Lou
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Follow Ups
- It is a question of "too much gain" - Lou S 18:45:09 01/20/07 (4)
- A wierd way of looking at things! - clifff 13:19:59 01/21/07 (3)
- Straw man argument! - Lou S 13:27:59 01/21/07 (2)
- I give in. You live in your world. nt - clifff 13:54:37 01/21/07 (1)
- Specifications and all, yes I do. nt - Lou S 13:56:11 01/21/07 (0)
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