Semiconductor equipment

Details Semiconductor equipment Semiconductor equipment

2007-10-30

2007-10-30

Lam, Tuan T (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Clock or pulse waveform generating

C327S298000, C327S099000

Reexamination Certificate

active

11180679

ABSTRACT:
There is provided a semiconductor integrated circuit in which a source clock (S101) is inputted to a delay circuit (3), a counter circuit (6) is operated in response to a delay clock (S102) which is the output of the delay circuit (3), a clock used as a system clock by an internal circuit (4) is selected from the source clock (S101) and the delay clock (S102) based on the value of the counter circuit (6), and the duty cycle of the system clock is changed, so that it is possible to reduce electromagnetic interference resulting from harmonics generated by the switching of the internal circuit.

REFERENCES:
patent: 5517109 (1996-05-01), Albean et al.
patent: 6075389 (2000-06-01), Umemoto et al.
patent: 6737904 (2004-05-01), Butaud et al.
patent: 6927604 (2005-08-01), Boerstler et al.
patent: 7196554 (2007-03-01), Taskin et al.
patent: 2003/0159079 (2003-08-01), Harima

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