p540 A low-Phase- noise CMOS Ring Oscillator with differential Control

Abstract
I. Introduction
II. Circuit design
III. Simulation and Comparison
The circuit is implemented in a 0.18um standard CMOS technology. The core layout of
the proposed VCRO without the pads is shown in Figure 3.

To determine the tuning range and the linearity of the proposed VCO, a parametric
analysis is performed in which the steady state frequency is measured for several control voltages.