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This the output I'm getting at 54 GHz. The value for L is 50pH and for that of the capacitor I'm not using any external ones so far but the capacitance should be 141fF as calculated from the equation.
Yes I'm designing a cross-coupled VCO at 60 GHz and the purpose is to achieve this frequency through voltage provided to LC. The thing is I'm achieving around 54 GHz and the output swing is skewed at some point. It is not a smooth sine-wave.
The circuit is a cross-coupled VCO topology.
Yes it is for the differential VCO.
I need to use these transistors as varactors in my VCO design.
What changes need to be done to get certain results as mentioned. It's urgent :(
So I modified the test bench as shown below with the results attached. Is this the correct method for a MOS transistor to be tested as a MOS varactor?
*The inductor value is 1pH.
Here is the netlist
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DC Analysis `dcOp'
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Important parameter values...
I am trying to characterize MOS varactors (NMOS) to get S-parameters along with the CV-curve for this circuit. However, I am not getting a suitable result. Please have a look and point out the mistake.
Vcntrl and Vs both as 0.1 v.
net03 is the gate to V node and net4 is the node of G to Vg.
-------NETLIST----------
simulator lang=spectre
global 0
parameters vcntrl=100m Vg=100m
View name: schematic
C1 (net4 net03 0) nvar_12rf w=(2u) l=(2u) ny=3 nx=3 m=1
Vg (net4 0) vsource dc=Vg mag=1m...
I want to use varactors to get the tuning curves but I am confused as to which varactor should be chosen among the available. Also, can the varactor type be identified by looking at the schematic? Attached is the figure for the reference. It's a NMOS varactor but is it a accumulation or an...
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