Cascode Power Amplifier

[jayce3390]

Hey Users,

It seems that the cascode PA topology allows to double the nominal drain supply voltage that a single transistor can handle.

Does anyone of you know ?

Thanks

 

[FvM]

If you don't mind the confusing twist brought in by the original poster, you find a references to a paper and related discussion in this thread. https://www.edaboard.com/threads/301330/

 

[jayce3390]

If you don't mind the confusing twist brought in by the original poster, you find a references to a paper and related discussion in this thread. https://www.edaboard.com/threads/301330/

I attached a related paper. On page 370 they mention that Vds is twice the practical supply voltgage.

thanks

 

[FvM]

If you presume that the safe Vdd level will be limited by maximum Vdg rather than Vds, then a cascode amplifier allows higher Vdd values, because the gate doesn't swing against drain node. That's not the strong effect discussed in the otherwise quoted "self-balancing cascode" papers, but still valuable.

But I don't see that the Vdd factor two stated in the text is supported by the comparative tables.