Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1989-08-18
1991-08-27
Callahan, Timothy P.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307269, 328155, 328 63, 328 72, H03K 500, H03K 513
Patent
active
050435965
ABSTRACT:
The present invention relates to a clock signal supplying device provided with an automatic phase regulating function for preventing errors in the phase regulation due to noise. In the device according to the present invention, there is disposed a reference signal serving as a phase reference, and transmission lines for clock signals and a transmission line for the reference signal are disposed from a clock signal supplying source to devices which are destinations of the distribution of clock signals. The transmission line for the reference signal is adjusted in advance so as to produce no skew. In the device, which is the destination of distribution of the clock signal, there is disposed a variable delay circuit for regulation of the phase of the clock signal and a phase comparing circuit for comparing the output of the variable delay circuit with the phase of the reference signal to output the result of the comparison. In the device according to the present invention, a noise filter is provided which detects phase regulation errors to effect correct phase regulation. Furthermore, the phase regulation is effected while avoiding a period of time wherein noise is apt to be produced.
REFERENCES:
patent: 4280099 (1981-07-01), Rattlingourd
patent: 4308649 (1982-01-01), Naito
patent: 4373204 (1983-02-01), Brooks
patent: 4461014 (1984-07-01), Fujino
patent: 4577163 (1986-03-01), Culp
Blum, "Automatic Adjustment of Several Decentrally Generated Clock Pulse . . .", IBM Tech. Dis. Bulletin, vol. 24, No. 2, Jul. 1981, pp. 895-897.
Anceau, "A Synchronous Approach for Clocking VLSI Systems", IEEE Journal of SSC, vol. SC-17, No. 1, Feb. 1982, pp. 51-56.
Fujita Bunichi
Ishii Shuichi
Itoh Hiroyuki
Kawashima Seiichi
Masuda Noboru
Callahan Timothy P.
Hitachi , Ltd.
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