Ati Technologies Inc.

David Ian James Glen

Philip L Swan

Ray Chau

Hugh Hin-Poon Chow

A method and apparatus for providing very small changes in the output oscillation of a controlled oscillation circuit, which may be used in a phase locked loop circuit, is accomplished by a phase-shifting controlled oscillator that includes an oscillation circuit and a selection circuit. The oscillation circuit generates a plurality of oscillations that are of approximately the same frequency and are approximately equally phase shifted from one another. The selection circuit is operably coupled to receive the plurality of oscillations and selects one of them to be the output oscillation based on a control signal. The very small change in the output oscillation occurs when the selection circuit, based on the control signal, selects another one of the oscillations to be the output oscillation. When the change happens, a single pulse is stretched by the phase difference between the &ldquo;old&rdquo; output oscillation and the &ldquo;new&rdquo; output oscillation.

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North York, Canada

David Ian James Glen