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General Asylum General audio topics that don't fit into specific categories. |
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General Asylum General audio topics that don't fit into specific categories. |
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In Reply to: too many transistors and too much negative feedback posted by morricab on June 25, 2015 at 02:46:54:
Let's take a step back for a second.
An Op-Amp has, by definition, very high gain and it is used with large amounts of feedback such that the closed-loop performance is determined by the passive feedback components and not the components within the op-amp.
So, if you don't like using lots of negative feedback don't use an op-amp. Simple.
Regarding too many transistors - this is an irrelevance considering the first point. A monolithic op-amp will use as many transistors as necessary to achieve high gain and whatever specs that are important. In open-loop terms any op-amp is very non-linear so using less transistors won't make it less 'bad'. This leads me to the topic of 'discrete op-amps' which, IMHO, is an oxymoron. Such a circuit may be justified to drive unusual loads but there is no justification on gain terms. If it is an op-amp it should have high gain and using discrete transistors to produce that gain does not make it more 'good'. One the other hand, if you want a moderate open-loop gain amplifier to use with a little feedback (in the style of a Nelson Pass power amp) then you probably have to design your own - but that isn't really an op-amp.
Regards
13DoW
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Follow Ups
- What is an op-amp? - 13th Duke of Wymbourne 15:47:55 06/25/15 (2)
- RE: What is an op-amp? - morricab 12:47:05 06/26/15 (0)
- Completely agree - E-Stat 17:00:44 06/25/15 (0)
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