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Old 6th August 2004, 11:00 PM   #1
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Default How about this one??

Hi everybody
after slight development of my mind (hopefully) I've made up this.
Is this gonna be OK?
Loking forward to comments
cheers
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Old 7th August 2004, 12:02 AM   #2
Gofer is offline Gofer  Netherlands
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Your fet's will go up in smoke. (thermal runaway)
Lose the opamps and work with a dual or single diffy input stage with a proper VAS.
The opamps (no matter how fast) are too slow to compensate for anything. (you need at least 50 Mhz bandwith)
The + side is in real life never a mirror image of the - side.
It looks like a balanced output stage instant bridge mode amplifier.
Any way it is allways nice to think (experiment) about something in your mind.

Keep on thinking and don't be shy like me ! Keep on posting.

Greetings from Govert-Jan
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Old 7th August 2004, 10:40 AM   #3
MikeB is offline MikeB  Germany
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I don't think this will work good.

There is one major designflaw:

- As the emitter of the upper driver is connected to ground, it will
never supply a negative voltage, thus the upper irf540 won't
work correct for negative voltageswing. The lower irf540 will open,
but the upper can not close. By exceeding the max Vgs of 20volt
the mosfet blows up.

Some minor designflaws:

- your capacitors to the drivers disable/reduce DC-feedback.
- 0.22uF for the feedbackcap is very small.
- The lower outputstage gets a delay through the extra inverting
opamp, this might produce heavy crossoverdistortion.
- The 800ohm to the gates are very large.

Mike (hoping that i had not some brainfart)
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