Mattingly, Stanger, Malur & Brundidge, P.C.
Semiconductor integrated circuit having oscillators or oscillation circuits connected to a wiring line at connection points with intervals in length there between
The oscillation circuit includes at least two ring oscillation circuits in each of which a plurality of inverters are connected in a ring shape in a multi-stage fashion, and a conductive wiring line. The output of at least one inverter of each of the ring oscillation circuits is connected to the conductive wiring line, whereby the plurality of ring oscillators are caused to oscillate at an identical frequency. A PLL is constructed in such a way that the oscillation circuit obtained by the above means is formed into a voltage-controlled oscillation circuit, and that a phase-frequency comparator, a charge pump circuit and a low-pass filter are employed.
Hitachi, Ltd.
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Koichiro Hirokazu Hiroyuki
Ishibashi Aoki Mizuno