Patent Number: 7,102,450

Title: Method and apparatus for providing clock signals at different locations with minimal clock skew

Abstract: A tapped phase shift ring oscillator may be used to provide multiple clock signals having variable phase delays. Phase delays may be selected to compensate for clock skews at different locations on high speed chips, or to provide clock signals having specific, desirable phase relationships, such as quadrature signals. The phase shift ring oscillator includes an odd number of amplifier stages. Each amplifier stage includes a phase shift network and an amplifier network. CMOS components used in the phase shift and amplifier networks provide voltage controlled variable phase shift and low gain, wide bandwidth, and low output impedance.

Inventors: Forbes; Leonard (Corvallis, OR)

Assignee: Micron Technology, Inc.

International Classification: H03K 3/03 (20060101)

Expiration Date: 9/05/02018