Re: Teledyne GPD462

On Tue, 29 Apr 2025 12:47:03 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

Don <g@crcomp.net> wrote:

Phil Hobbs wrote:

brian wrote:

I saw a paper (https://apps.dtic.mil/sti/pdfs/ADA030178.pdf) , active
antenna referring to a GPD 462 . - Hybrid amplifier
 
Does anyone know what the internal circuitry was?

 
That’s one of Avantek’s “low cost” hybrid MIC amplifiers. I used its
brother GPD-464 a fair amount back in the 80s. They were cheaper than their
very nice GPD-211 iirc.
 
AFAICT it’s a vanilla NPN Darlington, like most others of that era.
 
I still have the databook someplace, I think.

 
I think you mean MMIC
 
Danke,
 

>
Nope.
>
It’s a hybrid, not monolithic.
>
Cheers
>
Phil Hobbs

I think of Darlingtons as slow - they usually are - but most MMICs are
Darlingtons.

I like the simple, older parts, the ERA and LEE and GALI ones. The
more modern self-biasing parts have loopy low-frequency response.