One point I want to make (I have done research in this) about bipolar vs. MOSFET is that the notion "bipolar to mosfets because of inherently better distortion characteristics" isn't quite right. Distortion (due to nonlinearity - not noise which is design related) is lower in BJTs than in MOSFETs. This is why most makers today only use BJTs in output stages. In the near future, with recent developments in lateral MOSFET doping, this may not be the case anymore but for now, the BJT is the undisputed champ for linearity. One of the main advantages of going wtih MOSFET is that you can lower the amount of feedback before instability ensues. Design is a matter of weighing the trade-offs....
As for Class D, there is still some work to be done before all digital kills off analog IMO. There are many issues still to be resolved and talk about non-linearities!! I will stop here because I will get carried away with this one. Arthur
As for Class D, there is still some work to be done before all digital kills off analog IMO. There are many issues still to be resolved and talk about non-linearities!! I will stop here because I will get carried away with this one. Arthur