Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Clock or pulse waveform generating
Reexamination Certificate
2006-03-07
2006-03-07
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Clock or pulse waveform generating
C327S299000
Reexamination Certificate
active
07009439
ABSTRACT:
The present invention relates to a circuit and method for generating an internal clock signal. According to the present invention, it is determined whether an external clock signal is a high frequency or a low frequency. Depending on the determination, the external clock signal is waveform-shaped to generate an internal clock signal or the external clock signal as the internal clock signal as it is. Therefore, rising edge timings of the external clock signal and the internal clock signal become coincident regardless of the frequency of the external clock signal. Reduction in an operating margin within the circuit due to reduction in the pulse width of the internal clock signal is prevented. Thus, the circuit of the present invention can be used in the high frequency and the low frequency at the same time and reliability of the circuit can be improved.
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Callahan Timothy P.
Hynix / Semiconductor Inc.
Marshall & Gerstein & Borun LLP
Nguyen Hai L.
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