Can we use LVDS clock from VCXO as LO source to the Mixers.
Is there any constraints with this approach
Yes you can do this as long as the signal level is big enough. If a mixer requires an LO drive level of, say, 0 dBm, that's about 600 mVpp for a sinewave. If your signal is this big and if it can drive a 50 ohm load, then you shoudl be good to go.
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