Re: wideband RF impedance matching

Hi,

>I'm trying to impedance match a 250-450MHz VCO (designed for a 50 Ohm
>load) to an AD8343 mixer which has a 2.7+6.8j input impedance.
>

The impedance you quote is for the signal input at 50MHz only
and not for the local oscillator which is presumably non-critical
since it is squared-off internally. You should only need to
transform your VCO's output to a simple differential signal just
as in the data ***. If the VCO is choosey impedance-wise, then
maybe a simple resistive isolating pad between it and the balun
would help.


Cheers - Joe
.

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