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US 6,639,438 B2Granted
Apparatus and method for communication link having parallel signal detect with hysteresis
AssigneeIntel Corporation
InventorsRobert C. Glenn, Sumant Ranganathan
Life of this patent
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Abstract
A method is described that involves directing a signal through a hysteresis comparator. Then, determining if an output signal of the hysteresis comparator, in response to the signal, is an AC signal or a DC signal. Then, deactivating a signal reception unit that receives the signal if the hysteresis comparator output signal corresponds to a DC signal; or, activating the signal reception unit if the hysteresis comparator output signal corresponds to an AC signal.
Claims25
An apparatus, comprising:
- a) a signal line to propagate a signal;
- b) a hysteresis comparator having an input coupled to said signal line;
- c) an AC/DC detector circuit having an input coupled to an output of said hysteresis comparator, said AC/DC detector circuit having an output to indicate whether an output signal of said hysteresis comparator is an AC signal or a DC signal;
- and,
- d) a signal reception unit having a first input coupled to said signal line, said signal reception unit having a second input coupled to said AC/DC detector circuit output to control whether said signal reception unit has an activated or inactivated output, said signal reception unit output activated if said hysteresis comparator output signal is an AC signal.
2 more elements
A method, comprising:
- a) directing a signal through a hysteresis comparator;
- b) determining if an output signal of said hysteresis comparator, in response to said signal, is an AC signal or a DC signal;
- and
- c) inactivating an output of a signal reception unit that receives said signal if said hysteresis comparator output signal corresponds to a DC signal, or, activating said signal reception unit output if said hysteresis comparator output signal corresponds to an AC signal.
1 more element
An apparatus, comprising:
- a) a transmitter to transmit a signal;
- b) a receiver that is coupled to said transistor to receive said signal, said receiver comprising:
- 1. a signal line to propagate said signal;
- 2. a hysteresis comparator having an input coupled to said signal line;
- 3. an AC/DC detector circuit having an input coupled an output of said hysteresis comparator, said AC/DC detector having an output to indicate whether an output signal of said hysteresis comparator is an AC signal or a DC signal;
- and,
- 4. a signal reception unit having a first input coupled to said signal line, said signal reception unit having a second input coupled to said AC/DC detector circuit output to control whether said signal reception unit has an activated or inactivated output, said signal reception unit output activated if said hysteresis comparator output signal is an AC signal.
4 more elements
Dependencies are inferred from the claim text.