clintrubber
Well-known member
Hello,
When stuffing a DOA-PCB some thinking about the relevant requirements for complementary output devices came up.
What makes a NPN & PNP a nice pair ? There's obviously the Vbe-requirement and it'd be nice if speed was alike as well. And hFe.
Other things needing to be alike ?
Special case:
How about (differences in) current gain ? I figure that as they're both large enough all will be fine.
But with both being 'high enough', what when one of them was even higher, like a hFE of 300 vs 200 ?
Would this lower THD even a bit further during the relevant signal-half or are other things going to happen ?
Regards,
Peter
When stuffing a DOA-PCB some thinking about the relevant requirements for complementary output devices came up.
What makes a NPN & PNP a nice pair ? There's obviously the Vbe-requirement and it'd be nice if speed was alike as well. And hFe.
Other things needing to be alike ?
Special case:
How about (differences in) current gain ? I figure that as they're both large enough all will be fine.
But with both being 'high enough', what when one of them was even higher, like a hFE of 300 vs 200 ?
Would this lower THD even a bit further during the relevant signal-half or are other things going to happen ?
Regards,
Peter