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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: 1-2 mA Ibias for OPA134 ... coal to Newcastle? posted by jcox on May 6, 2002 at 22:10:45:
> from Zout = 1/2 * ( 26 mV / Ibias ) we can say output stage Ibias > 1.3 mA, unless they've used additional local feedback around the output stage transistorsWhere did the 26mV come from? And are you saying that I need more bias current, or that it's already biased to 1.3mA and therefore doesn't need any more, or something else?
> also why FET constant current source? Bipolar source with vref diode or Wilson current sink can set Ibias to < 5% tolerance with no trimming required
No idea one way or the other. I'm just following a recommendation I found on this forum. What are the disadvantages to using a FET, other than the need to measure and trim the resistor value?
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Follow Ups
- Re: OK, now I'm lost :) - Saurav 09:03:44 05/07/02 (2)
- Re: OK, now I'm lost :) - jcox 16:28:44 05/07/02 (1)
- Re: Thanks, that makes more sense (nt) - Saurav 17:33:40 05/07/02 (0)
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