Oscillators – L-c type oscillators
Reexamination Certificate
2005-12-06
2005-12-06
Kinkead, Arnold (Department: 2817)
Oscillators
L-c type oscillators
C331S17700V, C331S074000, C331S03600C, C331S17700V, C331S1170FE, C331S1170FE
Reexamination Certificate
active
06972635
ABSTRACT:
MEMS-based, computer system, clock generation and oscillator circuits and LC-tank apparatus for use therein are provided and which are fabricated using a CMOS-compatible process. A micromachined inductor (L) and a pair of varactors (C) are developed in metal layers on a silicon substrate to realize the high quality factor LC-tank apparatus. This micromachined LC-tank apparatus is incorporated with CMOS transistor circuitry in order to realize a digital, tunable, low phase jitter, and low power clock, or time base, for synchronous integrated circuits. The synthesized clock signal can be divided down with digital circuitry from several GHz to tens of MHz—a systemic approach that substantially improves stability as compared to the state of the art. Advanced circuit design techniques have been utilized to minimize power consumption and mitigate transistor flicker noise upconversion, thus enhancing clock stability.
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Brown Richard B.
McCorquodale Michael S.
Brppks Kushman P.C.
Kinkead Arnold
The Regents of the University of Michigan
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