Table 1.

PMOS transistor type comparison for their use in the VCO.

PMOS Type	${\mathit{K}}_1/{\mathit{K}}_2$	Cap. Density (fF/$\mathsf{\mu }{\mathbf{m}}^2$)	Linear Fit (${\mathit{R}}^2$)
Core	2.146	2.12	0.994
I/O	1.057	2.275	0.998
LVT	2.313	1.475	0.994
HVT	1.681	3.55	0.996