Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By frequency
Reexamination Certificate
2006-11-22
2008-09-23
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By frequency
C327S291000, C327S293000, C327S294000, C327S299000, C327S039000, C327S049000
Reexamination Certificate
active
07427879
ABSTRACT:
The present invention discloses a frequency detecting apparatus for detecting a frequency of an input clock. The frequency detecting apparatus includes: a pulse generator, a digital signal generator, and a decoder. The pulse generator is coupled to the input clock for extracting a period of the input clock to generate a pulse, and the digital signal generator is coupled to the pulse generator for converting the pulse into a plurality of logic values. The digital signal generator includes: a delay module coupled to the pulse, for delaying the pulse to generate a plurality of delayed pulses according to a plurality of delay amounts, respectively; and a sampling module coupled to the delay module for sampling the pulse to generate the logic values according to the delayed pulses, respectively. The decoder is coupled to the digital signal generator for determining the frequency of the input clock according to the logic values.
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Cole Brandon S
Nanya Technology Corp.
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