capacitor array design for vco

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rty94

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hello I am trying to design a capacitor array like the one above for vco wide tuning range. The problem is that when all switches are off it seems to give me frequencies much lower than expected but when switches are on it seems that it works fine. Could someone explain me where should I give attention to make design operational in every possible case or one other possible solution? Thank you very much in advance!!
 

Hi,

maybe leakage capacitance in the layout and the switches.

Klaus
 

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