JR and others,
>
> The reason you must use a filter on each half of the differential
> input is otherwise you'll lose your 180 degrees difference as one
side
> will be phase shifted by the filter and the other side won't ...
You
> don't lose the 90 I-Q phasing but instead lose your 50% duty cycle
> which has a similar effect with a QSD detector
My view is a little bit different.
The Iout is fed through the filter and the IoutB is used to gether
with the Iout to get a DC offset which is fed to the inverting input
of the comparator.
So, there is no problem of delay times between the two lines!
I think there is another reason of using 4 filters? What is the
improvement when going from 2 to 4 filters?
Johan PA3GSB
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