Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Clock or pulse waveform generating
Reexamination Certificate
2004-07-28
2008-11-04
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Clock or pulse waveform generating
C327S269000, C327S294000, C327S298000
Reexamination Certificate
active
07446587
ABSTRACT:
The invention provides a semiconductor device which can suppress a variation of clock signals. According to the invention, a single clock signal is divided into a plurality of clock signals and supplied to each of a plurality of circuits in a semiconductor device. Propagation delay time of each of the clock signals is not completely fixed in a design phase, but a circuit (variable delay circuit) which can appropriately change propagation delay time of a clock signal even after forming the semiconductor device is provided. By using the variable delay circuit, a variation in the propagation delay time is compensated so that a circuit provided in a subsequent stage of the variable delay circuit can operate normally on a desired condition. In specific, a phase of each clock signal is controlled.
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Partial English Translation of International Preliminary Examination Report (Application No. PCT/JP2004/010325) dated Sep. 14, 2004.
International Search Report (Application No. PCT/JP2004/010325) dated Sep. 14, 2004.
Luu An T.
Robinson Eric J.
Robinson Intellectual Property Law Office P.C.
Semiconductor Energy Laboratory Co,. Ltd.
Wells Kenneth B.
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