Abstract
A CMOS VCO with inherent compensation for temperature and process variations is presented. In the new design, the VCO input control is divided into two parts. One is controlled by a temperature and process compensation bias circuit and the other is controlled by an external input. A phase locked loop is used as the temperature and process compensation bias circuit. Two ideally identical VCOs are used. The control voltage of the VCO in the PLL will track the temperature and process variations. This control voltage is fed back to the VCO outside the loop. Simulation results show the total variation in the VCO frequency over a 100/spl deg/C temperature range and over the fast and slow process corners is about /spl plusmn/1.7%. This is a reduction of in excess of a factor of 12 when compare to a conventional VCO design based on the same delay stage.
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