The usual happened. Having searched for several days to find a mixer, I found one just after sending my
previous post...

I found the U2795B made by atmel.

Exploration continues...

Marcel

btw: the 'expensive' remark I made in my previous post aplies to the AD8302, not the LT5512...


Marcel van Lieshout wrote:
> Ok, as promised, this is how far I got until now.
>
> I've studied RF-principles, learned a little about LNA's, BPF's, mixers, VCO's, PLL's and
> RF-PCB-design. This took a lot of time ;-)
>
> I decided (for now) to go with an IF of 1575.42 MHz because bpf's are readily available (it's the
> GPS L1 frequency). The higher IF the better, well not too high of course...
>
> The only accurate phase-comparing device I have found is the AD8302 (analog devices). This chip
> has single-ended 50 ohm inputs and a analog voltage indicating the phase-difference on the inputs
> as output.
>
> The next thing I looked for was an appropiate mixer: A mixer that can handle an RF of 2400-2483
> MHZ, mix it with 824.58-907.58MHz to obtain the IF of 1575.42MHz.
>
> I found an affordable device ( the quite expensive LT5512 made by Lineair). This device, however
> has a balanced 400 ohm RF input and IF output. Because my RF-skills are still very minimal, I
> don't think I can match the mixer's IF to the comparator's input. I tried to find a
> balanced/unbalanced BPF to no avail.
>
> Does anyone know of another  suitable and affordable (a few dollars at most) mixer (best option)
> or how to match the ports with external parts (second best)?
>
> Marcel

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