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The varactors have been employed in VCO circuits operating at frequencies in excess of 40 GHz.
This paper presents a performance evaluation and comparison of three different types of CMOS varactors based on measurements.
The most significant use of varactors to date has been as the basic component in parametric amplifiers.
They key to understanding how a varactor or varicap diode works is to look at what a capacitor is and what can change the capacitance.
This nonlinearity allows the varactor to be used also as a harmonic generator.
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