Mapping a delta-sigma converter range to a sensor range
AssigneeRosemount Inc.
InventorsFeng Wang, Michael J. Gaboury
Life of this patent
Estimating the term…
Abstract
A mapping circuit coupled to the integrator circuit of a delta-sigma converter to map the analog input range of the integrator to the analog out-put range of the sensor. The integrator circuit provides an integrator output to a controller to generate a digital output, which is in a digital output range representing the analog input range. A sensor input circuit includes a sensor having an analog sensor output range. The mapping circuit is coupled to the integrator circuit and is responsive to control signals from the controller to map the analog input range of the integrator to the analog output range of the sensor.
Claims20
A delta-sigma converter providing a digital signal representative of a process variable, comprising:
- an integrator circuit having an analog input range and providing an integrator output;
- a controller responsive to an output from the integrator circuit to generate a digital output within a digital output range, the digital output range representing the analog input range, the controller providing control signals, the integrator circuit being responsive to the control signals to provide the integrated output to the controller;
- a sensor input circuit coupled to the integrator circuit and including a sensor having an analog sensor range, the sensor input circuit being responsive to the control signals to provide a balanced analog sensor signal within the analog sensor range to the integrator circuit, the balanced analog sensor signal being representative of the process variable;
- and
- a mapping circuit coupled to the integrator circuit and responsive to the control signals to map the analog input range to the analog sensor range.
An industrial process control transmitter arranged to be coupled to a central station by a two-wire communication link, the transmitter comprising:
- a sensor input circuit including a sensor responsive to control signals to provide a balanced analog sensor signal within an analog sensor range representative of the process variable;
- an integrator circuit coupled to the sensor input circuit and responsive to the control signals to provide an integrator output representative of the process variable within an analog input range;
- a controller responsive to the integrator output to generate a digital output within a digital output range, the digital output range representing the analog input range, the controller providing the control signals;
- a mapping circuit coupled to the integrator circuit and responsive to the control signals to map the analog input range to the analog sensor range;
- and
- a transceiver coupled to the processor and to the communication link for transmitting information from the processor to the central station.
Dependencies are inferred from the claim text.