Signal detect circuit for high speed data receivers
First Claim
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1. A method comprising:
- receiving a signal on a data path;
using a circuit that is not placed in the data path to develop a count of the number of positive and negative excursions of said signal; and
determining whether the number of positive and negative excursions of said signal indicates that the signal is a valid signal.
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Abstract
In accordance with one embodiment of the present invention, a signal detect circuit may analyze an input signal before passing it on to a receiver. The analysis may be done outside of the data path to avoid affecting the data path speed or adding distortion or jitter. The positive and negative thresholds of the data may be checked to see if the numbers of positive and negative crossings are comparable. Random and bursty noise can be detected since such noise normally does not have comparable positive and negative crossings.
9 Citations
16 Claims
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1. A method comprising:
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receiving a signal on a data path;
using a circuit that is not placed in the data path to develop a count of the number of positive and negative excursions of said signal; and
determining whether the number of positive and negative excursions of said signal indicates that the signal is a valid signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device comprising:
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a receiver having an input data path to receive an input signal;
a signal detect circuit coupled to the input data path, said circuit comprising;
a positive threshold detector to determine whether said input signal has a positive voltage above a predetermined threshold;
a positive count logic to count the number of times that said positive threshold is exceeded;
a negative threshold detector to determine whether the input signal has a negative voltage below a predetermined threshold; and
a negative count logic to determine the number of times the negative threshold is exceeded. - View Dependent Claims (9, 10, 11)
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12. A signal detect circuit comprising:
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a positive threshold detector to determine whether an input signal has a positive voltage above a predetermined threshold;
a positive count logic to count the number of times that said positive threshold is exceeded;
a negative threshold detector to determine whether the input signal has a negative voltage below a predetermined threshold;
a negative count logic to determine the number of times the negative threshold is exceeded; and
a comparator to compare the number of times that said input signal exceeds said positive and negative thresholds. - View Dependent Claims (13, 14, 15, 16)
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Specification