Bipolar/MOSFET CFP output stage - Page 3

mlloyd1 · 12th May 2003, 03:12 PM

so, i see all the issues over models

did anyone BUILD it yet and poke on it? what happened?

mlloyd1

Quote:

Originally posted by andy_c
...So my conclusion is that the models provided by On Semiconductor for the MJL3281a and MJL1302a are totally wrong...

Pjotr · 13th May 2003, 07:34 PM

Quote:

Originally posted by Circlotron

This INTERESTING! Could you please draw a graph of this to edify a non-mathematical dufus like me?

/Circlotron - can't cut it with the big boys when it comes to hard sums.

Hi Circlotron,

Attached a picture about what I mean. When I have time next weekend I will do some Spicy simulations. Although the Hitachi fet models I have are not that accurate.

Cheers

audiodesign · 26th September 2007, 12:06 PM

How to create this graphic plots ?

Could you send me the complete spice circuit and plot command ?

AndrewT · 26th September 2007, 12:28 PM

Quote:

Originally posted by Pjotr
Attached a picture about what I mean. When I have time next weekend I will do some Spicy simulations. Although the Hitachi fet models I have are not that accurate.

Hi,
the green line showing the ideal characteristic of subtracting the perfect transfers from each other cannot be achieved in ClassAB.
The subtraction problem is particularly accute over the middle portion where the line develops a wobble. It was this wobble that D.Self majored on in his papers and books on the the "blameless" and subsequent amps.

runebivrin · 26th September 2007, 12:38 PM

You've just got to love well menaing replies to miraculously resurrected threads.

a1greatdane · 28th November 2010, 09:31 AM

Hi all,
yes I have tried Mosfet drivers with Bipolar outs in CFB coubling and it worked quite well, but I did not ultimately like the sound of it...
Also You still need to employ Emitter resistors with the bipolars in order to prevent thermal runaway and current hugging between devices, so maybe there's not that much won here...

Cheers

26th September 2007, 12:38 PM	#25
runebivrin diyAudio Member Join Date: Jul 2003 Location: Huddinge, Sweden	You've just got to love well menaing replies to miraculously resurrected threads. __________________ Do wizards use spell checkers?

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26th September 2007, 12:06 PM	#23
audiodesign diyAudio Member Join Date: Sep 2005	How to create this graphic plots ? Could you send me the complete spice circuit and plot command ?

28th November 2010, 09:31 AM	#26
a1greatdane diyAudio Member Join Date: Oct 2005 Location: London E5	Hi all, yes I have tried Mosfet drivers with Bipolar outs in CFB coubling and it worked quite well, but I did not ultimately like the sound of it... Also You still need to employ Emitter resistors with the bipolars in order to prevent thermal runaway and current hugging between devices, so maybe there's not that much won here... Cheers

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