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Old 16th July 2002, 01:52 PM   #1
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Default low crossover-distortion class AB output stage topologies

I have searched the forum but I have not found a comprehensive discussion of any non-switching dynamic bias design. Before I start discussing circuits that I have come across, please let me know if I overlooked anything here.

Thanks,

Eric
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Old 16th July 2002, 02:08 PM   #2
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Smile Re: low crossover-distortion class AB output stage topologies

Quote:
Originally posted by capslock
. Before I start discussing circuits that I have come across, please let me know if I overlooked anything here.

Thanks,

Eric
Well, that would be difficult, not knowing which ones you DID find!

Cheers, Jan Didden
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Old 16th July 2002, 02:13 PM   #3
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Hi capslock

I came across some in EW & WW (Electronics World and Wireless world).

Regards

Charles
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Old 16th July 2002, 02:18 PM   #4
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Well, as I said, nothing comprehensive. A couple of allusions by Nelson to his non-switching patent which I was going to discuss here. A reference the the D. Self bias circuit which in my eyes is just an extraordinarily stable static bias generator, i.e. in its published form it does nothing to provide dynamic bias. The rest is all bits and pieces with passing reference taken to this or that design which is why I thought a dedicated thread might be justified.

Greetings,

Eric
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Old 16th July 2002, 02:20 PM   #5
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Aside from that, I have only the examples given in Skritek's book and some of the articles cited there. So I would be grateful for any other schematic, article, patent to look through and discuss.
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Old 16th July 2002, 03:43 PM   #6
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Default That is an interesting Challenge!

I have, with pen and papper,
tried to find a satisfactory solution,
that never lets one transistor's Current go below a certain point,
while the other is conducting output current.

Of cource this is possible, but I have tried
to find a so easy and simple way as possible.

Not found it yet.
I'll tell you when I have.
Haven't dealt with that problem for a long time.
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Old 16th July 2002, 03:53 PM   #7
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Quote:
Originally posted by phase_accurate
Hi capslock

I came across some in EW & WW (Electronics World and Wireless world).

Regards

Charles
Could you post a rough schematic?

Thanks,

Eric
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Old 30th June 2004, 01:14 AM   #8
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I will have to draw and scan it, but I have a BJT class AB circuit with no crossover distortion. Cross over noise is absolutly unacceptable by my standards.
I will post it later.
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Old 3rd May 2011, 06:48 AM   #9
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Old 3rd May 2011, 11:43 AM   #10
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Quote:
Originally Posted by cunningham View Post
Cross over noise is absolutly unacceptable by my standards.
I will post it later.
Crossover distortion is not just noise, but also linear distortion that sounds so disgusting if not reduced to acceptable scale.
Solution: Feedback Error Eorrection, Feedforward EC, and many other.
Currently I am using 30-70mA feedforward with crossing control, and Negative Feedback for main output stage (its still drift 40mA when cool 100mA when hot, I am going to fix it again sometime, I don't like thermal drift).

May be he forgot to post it.
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