Just FYI (and Zach may have comments) I don't know about differential first not, but the fact that the 5043 and switch between them means that the single ended output can be optimized for one band while the differential can be optimized for another band. That's how one RT-IHU processor can do either Rx or Tx (but not simultaneously) on two different bands with the same 5043.

73,

Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*

On Thu, Apr 27, 2023 at 10:14 AM Jim McCullers via pacsat-dev < pacsat-dev@amsat.org> wrote:

The bandpass filter and LNA would proceed this circuit. Most LNAs I'm familiar with are single ended output. Differential input is a bit of an oddity for an RF interface. I'm certain someone had a reason.

In our instance we will have a bandpass filter followed by an LNA followed by a 1:4 splitter for the four receivers. Each receiver will require some form of single end to differential converter.

73,

Jim McCullers WA4CWI

On Thu, Apr 27, 2023 at 03:14:21AM +0000, Jim McCullers via pacsat-dev wrote:

...

Attached is a document that I prepared to describe work I've done with AX5043 to create a receiver with a reduced component count.

I'll post it to github later.

Just curious, I'm not an expert on RF, but where does the LNA fit in here? It seems like you could do the conversion from single-ended to differential using an LNA if you were already using one.

I've only played with single-ended designs, so this is something completely different for me.

-corey

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