Hi, In a lot of simulated circuits (restricted to the LTP input, three stage amp genre) I observed that - every other thing being equal - the ones with NPN I/S, and consequently, PNP Vas, perform slightly better than the PNP I/S counterpart.
Not sure if such thing exist in real life circuits, I'm not equipped to detect tiny differences in THD. Is this a common observed phenomen, or only a simulation "mirage" ?
Someone experienced the same thing?
Cheers
J.
Not sure if such thing exist in real life circuits, I'm not equipped to detect tiny differences in THD. Is this a common observed phenomen, or only a simulation "mirage" ?
Someone experienced the same thing?
Cheers
J.
Hi,
Generally PNP is preferred in the input LTP due
to noise considerations, thus giving a NPN Vas,
which should have higher Ft than a PNP device.
rgds, sreten.
Generally PNP is preferred in the input LTP due
to noise considerations, thus giving a NPN Vas,
which should have higher Ft than a PNP device.
rgds, sreten.
I would expect that the slightly quieter PNP LTP combined with the slightly better performance NPN VAS, that this arrangement will work slightly better than an NPN LTP.
Ok then, this is convincing enough argument to follow the PNP i/s path in real life circuits, whenever possible
- Status
- Not open for further replies.