[time-nuts] DMTD using Active Mixers

[Bruce Griffiths]

Mario Sanchez wrote:
> Hi all,
>
>
>
> I am starting building a DMTD, and for simplicity reasons I started with
> active mixers...
>
> What are the advantages/disadvantages of using passive mixers instead?
> Someone has had the experience to compare them?
>
>
>
> As LO, I am using a Synthesizer whose amplitude is approx 500mVpp, and the
> RF signal could be between 500mVpp - 2.8Vpp
>
>
>
> Thanks in advance for you input...
>
>
>
> Regards,
> Mario
>    
Mario

Active mixers almost invariably have a higher noise floor than passive 
mixers, particularly in the flicker noise region.
Consequently a DMTD system using active mixers will have a higher system 
noise floor than one using active mixers.

Bruce