Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By frequency
Reexamination Certificate
2005-01-11
2005-01-11
Nguyen, Minh (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By frequency
C331S037000, C324S076410
Reexamination Certificate
active
06842049
ABSTRACT:
An apparatus for detecting a difference between frequencies includes a beat waveform generator which generates a beat waveform signal having a frequency which is equal to a difference between frequencies of a reference clock signal and a target clock signal. A frequency divider divides the reference clock signal by N, where N is an integer, to generate a divided reference-clock signal. A frequency comparator compares frequencies of the beat waveform signal and the divided reference-clock signal, and generates a step out alarm signal which is a binary signal depending upon a polarity of a difference between the frequencies of the beat waveform signal and the divided reference-clock signal.
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Mitsubishi Denki & Kabushiki Kaisha
Nguyen Minh
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