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The basic function of the varactors is to cause a voltage dependent capacitors. While a junction varactor has a predictable equation for its capacitance, a MOS cap is used only when there is weaker inversion(smaller voltage at the gate).
In this region a MOS varactor is highly linear in the sense that there is almost a linear relationship between voltage and capacitance. But the whole voltage range is very narrow.
For a junction cap( diode cap), the region is more wider for capacitance scaling but it is not a very linear relation.
The basic function of the varactors is to cause a voltage dependent capacitors. While a junction varactor has a predictable equation for its capacitance, a MOS cap is used only when there is weaker inversion(smaller voltage at the gate).
In this region a MOS varactor is highly linear in the sense that there is almost a linear relationship between voltage and capacitance. But the whole voltage range is very narrow.
For a junction cap( diode cap), the region is more wider for capacitance scaling but it is not a very linear relation.
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