[time-nuts] Norton amplifiers
Alexander Pummer
alexpcs at ieee.org
Mon Jan 13 18:29:16 UTC 2020
there was one "zwischen basis-Schaltung" which has good noise properties
basically the basis and the emitter of a bipolar transistor is connected
to the two ends of a transformer's secondary winding ,a a tap on said
winding is grounded Ulrich Rohde may could tell more about it, I have
seen articles written by him on that subject long time ego perhaps in
German.
73
KJ6UHN
Alex
On 1/13/2020 9:27 AM, Jeffrey Pawlan wrote:
> Many years ago I did a study of Norton amplifiers and optimized for
> IP3 using non-linear circuit simulation tools. I published a two part
> article in RF Design Magazine which covered the amplifier itself as
> well as the non-linear model for the BJT. My use for the Norton
> amplifier did not require high isolation so I spent little tile on
> that aspect. I am friends with the co-inventor of the original and the
> author of the subsequent patents. His name is Allen Podell. The
> webpage you included speculated that the reverse isolation degradation
> at high frequencies was owing to the layout or the transformer.
> Although those are contributors, the simulation showed high
> frequencies had poorer s12 so it is expected.
>
> If high isolation is what you need, then as written on this list,
> there are ICs which can provide this much better than a single stage
> amplifier. They do suffer from more residual noise however.
>
> Jeffrey Pawlan
>
>
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