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US 7,046,180 B2Granted
Analog-to-digital converter with range error detection
AssigneeRosemount Inc.
InventorsJonathon Michael Jongsma, Garrie David Huisenga
Life of this patent
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Abstract
A circuit includes a multiplexer, an analog-to-digital converter, and a processor that compares a sequence of digital outputs from the analog-to-digital converter to a sequence of normal ranges that correspond with the digital outputs in order to provide an error output when one of the digital outputs is outside its normal range.
Claims25
A circuit, comprising:
- a multiplexer having a select input and a sequence of analog outputs that are selected from a plurality of analog inputs provided by an analog system;
- a reference source providing a first reference;
- an analog-to-digital converter receiving the sequence of analog outputs and the first reference, and providing a sequence of digital outputs;
- and
- a control circuit actuating the select input to select the sequence of the analog outputs, the control circuit comparing the sequence of digital outputs to a stored sequence of normal ranges that correspond with the digital outputs to provide an error output when at least one of the digital outputs is not in its normal range, the control circuit further providing a real time output that represents a useful parameter of the analog system.
2 more elements
A method of detecting an error, comprising:
- providing a plurality of analog inputs generated by an analog system;
- generating a sequence of analog outputs that are selected from the plurality of analog inputs as a function of a select input;
- providing a first reference;
- receiving the sequence of analog outputs and the first reference, and providing a sequence of digital outputs that represent the sequence of analog outputs;
- and
- actuating the select input to select the sequence of the analog outputs;
- comparing the sequence of digital outputs to a stored sequence of normal ranges that correspond with the digital outputs to provide an error output when at least one of the digital outputs is not in its normal range;
- and
- providing a real time output that represents a useful parameter of the analog system.
6 more elements
A circuit, comprising:
- a multiplexer having a select input and a sequence of analog outputs that are selected from a plurality of analog inputs provided by an analog system;
- a reference source providing a first reference;
- an analog-to-digital converter receiving the sequence of analog outputs and the first reference, and providing a sequence of digital outputs;
- and
- means for actuating the select input to select the sequence of the analog outputs, and for comparing the sequence of digital outputs to a stored sequence of normal ranges that correspond with the digital outputs to provide an error output when at least one of the digital outputs is not in its normal range;
- and
- means for providing a real time output that represents a useful parameter of the analog system.
4 more elements
Dependencies are inferred from the claim text.