Mattingly, Stanger & Malur, P.C.
Semiconductor integrated circuit having oscillators or oscillation circuits connected to a wiring line at connection points with intervals in length therebetween
An oscillation circuit provides clock signals and a clock distribution circuit or system of circuits having low skew and low jitter to logic circuits and memory circuits of a microprocessor or the like. Further, a semiconductor integrated circuit device of high speed is provided as a result of the stable clock signal that is generated and distributed. The oscillation circuit is in a semiconductor integrated circuit device having a plurality of oscillators each having an oscillation node, wherein the oscillation nodes of each of the oscillators are connected together by a conductive wiring line that may be a closed loop. The oscillators are synchronized to oscillate at substantially the same frequency. The oscillators are connected to the conductive wiring line at connecting points having substantially the same interval of conductive wiring lengths between the connection points, which leads to synchronizing the oscillators to oscillate with a substantially identical phase. The conductive wiring line can also be formed in the shape of a mesh with the interval of length of the conductive wiring line between the connection points being at least 50 &mgr;m. The oscillators are ring oscillation circuits having inverters connected in a ring shape wherein an output of at least one inverter of each ring oscillation circuit is connected to the conductive wiring. Alternatively, the oscillators may be delay lines having multistage connected inverters with at least one inverter connected to the conductive wiring line.
Hitachi, Ltd.
H G H H H H H H H H
H03K G06F H03L H03L H03L H03L H03K H03L H03L H03K
inventional inventional inventional inventional inventional additional inventional additional inventional inventional
Hirokazu Hiroyuki Koichiro
Aoki Mizuno Ishibashi