lc-vco switched capacitor and varactor

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haley_8

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switched capacitors vco

does anyone know how to design the frequency tuning for a lc-vco using both switched capacitors and varactors? Thanks!
 

lc-vco with switched capacitor

if you can elaborate your question, maybe people can help out.
 

For LC OSC, varactor tuning range is limited. So a switch cap array is used to increase the tuning range. the varactor tuning rang should cover the step between the switch cap .
 

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