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US 5,508,645 AGranted
Circuit for raising a minimum threshold of a signal detector
AssigneeInternational Business Machines Corporation
InventorsGregg R. Castellucci, Terry C. Coughlin, Jr.
Life of this patent
Estimating the term…
Abstract
A signal detector circuit in a data receiver including a programmable hysteresis circuit for setting and detecting the presence of both a threshold minimum data signal level and a reset signal level higher than the minimum signal level.
Claims13
A signal detector circuit comprising:
- receiving means for receiving data signals;
- a level indicator circuit coupled to the receiving means for determining whether or not a signal strength of the data signals is less than a preselected minimum signal level;
- output means coupled to the level indicator circuit for indicating whether or not the signal strength of the data signals is less than the preselected minimum signal level;
- and
- reset means coupled to the output means for setting a reset minimum signal level greater than the preselected minimum signal level by a preselected difference in response to an indication by the output means that the signal strength of the data signals is less than the preselected minimum signal level, the output means maintaining the indication that the signal strength of the data signals is less than the preselected minimum signal level until the signal strength of the data signals reaches the reset minimum signal level.
2 more elements
A data processing (DP) system comprising:
- receiving means for receiving data signals, the receiving means including an output means outputting the data signals to the DP system;
- a signal detector coupled to the receiving means for determining whether or not a signal strength of the data signals is greater than a preselected minimum signal level, and for indicating to the DP system whether or not the signal strength of the data signals is greater than the preselected minimum signal level;
- processing means for processing the data signals and the indication to the DP system from the signal detector;
- and
- the signal detector including a reset circuit for setting a reset minimum signal level greater than the minimum signal level by a preselected difference in response to the signal detector indicating to the DP system that the signal strength of the data signals is less than the preselected minimum signal level, the signal detector maintaining an indication to the DP system that the signal strength of the data signals is less than the preselected minimum signal level until the signal strength of the data signals reaches the reset minimum signal level.
2 more elements
A feedback circuit for a signal detector, the feedback circuit comprising:
- a sensing circuit coupled to an output of the signal detector for receiving an insufficient signal issued by the signal detector indicating that signals incoming to the signal detector are below a minimum threshold, and for receiving a `sufficient` signal issued by the signal detector indicating that the incoming signals are above or equal to the minimum threshold;
- and
- a reset circuit coupled to the sensing circuit for raising the minimum threshold in response to the sensing circuit receiving the insufficient signal from the signal detector so that the signal detector continues issuing the insufficient signal until the incoming signals are above or equal to the raised minimum threshold.
Dependencies are inferred from the claim text.