I am working on a circuit project which requires some capacitor to be dynamically tunable, preferably by an external control voltage.

Just wondering if there are any capacitor components in the market that can provide dynamically tunable capacitance, for example the capacitance oscillates sinosoidally between 10 nF and 20 nF with a frequency of few kHz?

I have browsed through several online electronic component marketplace, but couldn't find any tunable capacitor that work like this...


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