[time-nuts] AM/PM conversion on mixer, DMTD

[Bob kb8tq]

Hi

In any DMTD setup, isolation between the mixers can be an issue. Proper
termination (at least at the RF ports) is important with any mixer if you want
to get the rated spec’s. 

In terms of “who makes the best double balanced mixer?” there used to be a 
lot of choices. MiniCircuits rarely came up on top of the list. These days
there don’t seem to be as many people doing that sort of thing.

Bob

> On Feb 9, 2021, at 4:58 AM, Mattia Rizzi <mattia.rizzi at gmail.com> wrote:
> 
> Hello!
> I just started a new job with a project involving laser synchronization.
> The idea of my colleague is to use basically DMTD as a phase detector (RF 3
> GHz, IF=10..20MHz), and then digitize the IF with ADCs.
> He is very worried about AM/PM conversion (he's looking for something like
> 0.1degree/dB at 3 GHz), and he told me that the best results were with high
> LO level mixers (he was testing double balanced mixers eval boards, I think
> from minicircuit).
> I had a look at the literature and I found a paper [1] that put an
> upperbound between AM/PM and OIP3. Therefore I am looking for triple
> balanced mixers or DBM with high IP3.
> My question is: in your experience is that all or there's something else?
> 
> Thanks!
> 
> [1] M. J. W. Rodwell, D. M. Bloom and K. J. Weingarten, "Subpicosecond
> laser timing stabilization," in *IEEE Journal of Quantum Electronics*, vol.
> 25, no. 4, pp. 817-827, April 1989, doi: 10.1109/3.17346.
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