[hpsdr] "Hochleistung-Linearendstufe mit Envelope-Tracking-Steurung"

[Helmut Oeller]

Hi Bert,

At http://openhpsdr.org/wiki/index.php?title=THOR  you can see more about EER and recognize that the switched class D/E amps usually need a matching network for each band, while the ET (envelope tracking) principle can employ standard class A/B power amps.
That’s the reason why HB9EPU and I stopped an EER project in 2012 based on Atlas boards. Things became very attractive again with Phil’s Envelope-PWM-Converter implemented in Hermes and Warren’s PS application.
BTW a nice paper is available here https://www.rohde-schwarz.com/us/applications/envelope-tracking-and-digital-pre-distortion-test-solution-for-rf-amplifiers-application-note_56280-54791.html

73, Helmut, DC6NY





-----Ursprüngliche Nachricht-----
Von: Hpsdr [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von H.A.Meijer
Gesendet: Mittwoch, 10. Mai 2017 08:05
An: hpsdr at lists.openhpsdr.org
Betreff: Re: [hpsdr] "Hochleistung-Linearendstufe mit Envelope-Tracking-Steurung"

***** High Performance Software Defined Radio Discussion List *****

Hi,

Maybe the reasons which one is better and why, will become clear in the 
rest of his article.

73' Bert  PA2XHF


Op 9-5-2017 om 22:38 schreef Helmut Oeller:
> Hi Bert,
>
> EER is out of some reason, but ET Envelope-Tracking is the target, for Rüdiger too. Some people are working on a 'Envelope controlled' Powersupply for broadband HF power ampfliers to achieve total efficiencies of approx. 80 percent.
>
> 73, Helmut, DC6NY
>
> -----Ursprüngliche Nachricht-----
> Von: Hpsdr [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von H.A.Meijer
> Gesendet: Dienstag, 9. Mai 2017 20:50
> An: hpsdr at lists.openhpsdr.org
> Betreff: [hpsdr] "Hochleistung-Linearendstufe mit Envelope-Tracking-Steurung"
>
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi,
>
>
> for people that maybe interested in the HPpowerSDR  EER possibility's (
> Envelope Elimination and restoring),
>
> there has just started an interesting article in the German "Funk
> Amateur" magazine
>
> from Rüdiger - DJ1MR on this kind of linear amplifiers and HPSDR.
>
>
> 73'  Bert  PA2XHF
>
>
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