For an LC Tank VCO, you can replace the capacitances with two simple MOS; Drain Source and Bulk are connected to each other as a one port and the gate is another port.
There are some discussions about the Direction of this element, and I have seen both directions in LC tank VCOs.
Hi
you can refer to Tsividis's works such as:
"Operation and Modeling of the MOS Transistor," Yannis Tsividis
as well to the best paper entitled: "0.5-V Analog Circuit Techniques and Their Application in OTA and Filter Design," by Chatterjee, Tsividis and Kinget
to find out making varactors in most famous configs. and then VCO but from the paper.
some design kits contains an accumulation mode varactor , instead of putting the n+ regions inside p-well, they put it in an nwell, so that the charaterisitics of the mos capacitance behave in a monotonic manner
For an LC Tank VCO, you can replace the capacitances with two simple MOS; Drain Source and Bulk are connected to each other as a one port and the gate is another port.
There are some discussions about the Direction of this element, and I have seen both directions in LC tank VCOs.