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VCO and Static frequency divider interfacing

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haadi20

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I am designing a 60 GHz LC VCO and connecting it with a static frequency divider (SFD).

Both components are working properly independently. The VCO has a CS buffer at the output.

But when i connect them together the amplitude of the VCO buffer output reduced considerably and cannot drive the CLK transistors in the SFD which are around 38 um.

How can i resolve this issue?

Please reply soon. You can ask for points if you want.
 

500 points for a helping reply...!
 

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