[time-nuts] RF Mixers for oscillator comparison
Arnold.Tibus at gmx.de
Sun Apr 19 22:04:57 UTC 2009
On Mon, 20 Apr 2009 09:03:36 +1200, Bruce Griffiths wrote:
>Corby Dawson wrote:
>> Look at the top of page 3 on the link below. Not sure how they arrived at
>> their conclusion but there is one opinion on the HP mixers!
>> Corby Dawson
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>Statements about the low flicker noise of these mixers are sprinkled
>throughout the phase noise literature.
>Someone must have measured the phase noise of these and other mixers at
>Its relatively easy to measure mixer phase noise:
>All one needs is a low noise preamp plus a sound card a 90 degree hybrid
>(or a suitable length of coax and a splitter) and a low noise source.
>However NIST papers often include a phase noise plot (attached) that
>illustrates that high level mixers can have a significantly lower phase
>noise than low level mixers (like the HP10514A).
>When choosing a mixer for this for phase noise measurement applications
>one may actually need to measure the phase noise characteristics of
Wow, a good overview, Bruce!
But remain the questions:
which are these high level mixers, are they readily available?
Are they affordable?
Perhaps not, why are they then not applied more often?
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