Oscillators – Ring oscillators
Reexamination Certificate
2007-11-05
2009-11-10
Chang, Joseph (Department: 2817)
Oscillators
Ring oscillators
C331S045000, C327S296000, C327S274000
Reexamination Certificate
active
07616070
ABSTRACT:
Disclosed are multiphase oscillators comprising a plurality of delay stages serially coupled in a loop by a plurality of nodes, with the loop being folded to provide two concentric rings of delay stages with equal numbers of allocated nodes. A second plurality of negative-resistance elements are provided, each element having a first output coupled to a node on the first concentric ring and a second output coupled to a node on the second concentric ring. Each such output switches between first and second voltage levels, and provides a negative resistance to a signal coupled to it during at least a portion of the transition between voltage levels. The outputs of an element switch to opposite voltage levels. With this construction, a high-voltage pulse propagates around the loop of delay stages, with a low-voltage pulse propagating behind it. Also disclosed are circuits to control the direction of pulse propagation.
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Tzartzanis Nestor
Walker William W.
Baker & Botts L.L.P.
Chang Joseph
Fujitsu Limited
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