Marcus
Thanks for the feedback about the Hittite chips. Yes, they are now
available as packaged devices. I don't have easy access to wirebonding
equpment, so chip devices aren't really practicable.
I'm sure that there will be some need for hardware phase/amplitude
trimming. That doesn't worry me. FWIW, there is a little prior work on
image reject, direct to baseband, receivers for the 10GHz amateur
allocation (with analogue baseband processing) published by one of the
guys over in S5. Designing a broadband receiver would be a little more
of a challenge!!!
> I used some a time ago ... but it was a die version.I don�t remember
which
> one (prototyping 2 y.a.). At that time the mixers they carry for such
> frequencies requires bond wiring. I guess today they have encapsulated
> units.
>
> I left this designs in stand by for a while because our target is/was a
> common platform from 6 to 23GHz with quadrature demodulator. And
most of
> this chips will need some sort of external trimming on
PCB/levels/phases to
> improove sideband supression. I guess on narrow band 10GHz this can
be done
> easily. For wideband apps I guess we need to develop our own
wideband I/Q
> demods :o). Centellax carry some (6 to 20GHz) but are expensive
(1400 USD)
> and LO must be 2X received freq (e.g a 20.5GHz LO for 10.25GHz RX).
I intend to look at the AD8347 at 2.3GHz in the near future, although
I need to make a local oscillator, as I only have one signal generator
suitable for ssb use at that frequency.
BTW. It's good to see another Eagleware user here. I have used the
software since it was called SuperStar and ran under DOS!!
Vy 73
Chris
GW4DGU
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