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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Re: Thanks. posted by Charles Hansen on June 26, 2003 at 17:05:32:
>It's easy to tell the effect of the loading. Just measure the actual gain when it's hooked up. For instance if the gain = 0.90, the driver will see the full Cgd and 10% of the Cgs.<This is very intuitive, actually. Awhile back I was thinking one day to myself "why does the Miller effect happen?" and then I thought "the voltage is inverted and moving away from the input at a rate that equals the gain of the stage, hence the capacitance charging requirements is multiplied by this Miller effect." Simple enough. So what you mention is the same intuitive thinking. In this case, the output is moving away at only a fraction of the input since it's a follower, and so it's the "fractional gain effect" or whatever, which makes the Cgs a fractional part. I've never actually read about this "effect", but it makes perfect sense.
My training is limited to my undergraduate EE degree 19 years ago and my job experience, which is not always about circuits (a lot about other devices like couplers and bias tees, and microwave calibration theory). This audio hobby and the gems I read here on occasion helps my understanding for my new job as test engineer for microwave amplifiers. I don't actually have to know the full theory of the devices I test, but it helps me to understand what parameter I am trying to test. In fact, my practice in designing my own amps, even though I usually use "FETs with heaters", helped me land my job as a test engineer, because I understood the devices and how they are used.
I want you to know your wealth of information is greatly appreciated, and that goes for everyone who has helped me.
And if I could ever get a job as an audio amp designer, it would be my dream job. Of course, that usually means I become an entrepreneur and form my own business and work on my own, because this is a boutique industry.
My experience with audio is that much of the great devices ever used for audio amplification has been long obsolete. I want to try to see if there's magic to be found with the new devices, just to know what the future really holds. I even find that the lateral MOSFETs that are designed for audio is not so abundant. It's a computer world, and high performance audio is not what most devices are designed for. It's kind of sad, really.
Okay, enough of that down thinking. :)
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Follow Ups
- Re: Thanks. - kurt s 21:52:37 06/26/03 (1)
- But even the obsolete devices we cherish - Leisure7 14:32:22 06/27/03 (0)
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