Detecting distortion in spread spectrum signals
AssigneeInternational Business Machines Corporation
InventorsJohn Borkenhagen, Christopher Steffen, Grant P. Kesselring
Life of this patent
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Abstract
The invention relates to a method, a circuit, and an apparatus for detecting distortion in spread spectrum signals. An edge in a spread spectrum clock signal is identified based on a reference clock signal. The edge data is then provided to a set of counters which are incremented corresponding to an identified edge. Each bit of a respective output of the counters are provided to a respective OR gate of a set of OR gates. An OR gate from the set of OR gates corresponding to a selected bit then outputs an indication of whether distortion exists in the spread spectrum clock signal.
Claims20
A method of detecting distortion in spread spectrum signals, the method comprising:
- identifying, based on a reference clock signal, one or more edges in a spread spectrum clock signal;
- incrementing one or more counters corresponding to the one or more edges, the one or more counters included in a plurality of counters;
- providing each bit of a respective output of the plurality of counters to a respective OR gate of a plurality of OR gates;
- and
- outputting, based on an output of an OR gate of the plurality of OR gates corresponding to a selected bit, an indication of whether distortion exists in the spread spectrum clock signal.
A circuit for detecting distortion in spread spectrum signals, the circuit configured to perform steps comprising:
- identifying, by a XOR gate, based on a reference clock signal, one or more edges in a spread spectrum clock signal;
- incrementing one or more counters corresponding to the one or more edges, the one or more counters included in a plurality of counters;
- providing, by the plurality of counters, each bit of a respective output of the plurality of counters to a respective OR gate of a plurality of OR gates;
- and
- outputting, by an OR gate of the plurality of OR gates corresponding to a selected bit, an indication of whether distortion exists in the spread spectrum clock signal.
An apparatus for detecting distortion in spread spectrum signals, comprising:
- a circuit configured to perform steps comprising:
- identifying, by a XOR gate, based on a reference clock signal, one or more edges in a spread spectrum clock signal;
- incrementing one or more counters corresponding to the one or more edges, the one or more counters included in a plurality of counters;
- providing, by the plurality of counters, each bit of a respective output of the plurality of counters to a respective OR gate of a plurality of OR gates;
- and
- outputting, by an output of an OR gate of the plurality of OR gates corresponding to a selected bit, an indication of whether distortion exists in the spread spectrum clock signal.
Dependencies are inferred from the claim text.