Precision adc sampling clock for high accuracy wireless guided wave radar
AssigneeRosemount Inc.
InventorEric Russell Lovegren
Life of this patent
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Abstract
A level transmitter includes an analog-to-digital convertor clock signal generator that receives a transmitter clock signal that is used to establish when an incident signal is transmitted toward a material boundary. The analog-to-digital convertor clock signal generator uses the received transmitter clock signal to generate an analog-to-digital convertor clock signal. An analog-to-digital convertor samples an analog waveform based on the analog-to-digital convertor clock signal and generates a digital value for each sample of the analog waveform. An analysis module analyzes the digital values to determine a distance to the material boundary.
Claims20
A level transmitter comprising:
- an analog-to-digital convertor clock signal generator that receives a transmitter clock signal and uses the received transmitter clock signal to generate an analog-to-digital convertor clock signal, where the transmitter clock signal is used to establish when an incident signal is transmitted toward a material boundary;
- an analog-to-digital convertor that samples an analog waveform based on the analog-to-digital convertor clock signal and generates a digital value for each sample of the analog waveform;
- and
- an analysis module that analyzes the digital values to determine a distance to the material boundary.
A method comprising:
- beginning at a start time, directing a series of incident signals toward a material;
- generating a second signal that designates a time for converting an analog waveform representing reflected signals from the material into a digital value such that the time for converting occurs an amount of time after the start time and such that the amount of time is independent of variations in interrupt handling.
A level transmitter comprising:
- an incident signal generator that transmits an incident signal toward a material;
- a dedicated analog-to-digital convertor clock generator that generates an analog-to-digital convertor clock signal;
- a receiver that receives a reflected signal from the material and generates an analog signal from the reflected signal;
- and
- an analog-to-digital converter that receives the analog-to-digital convertor clock signal and produces digital samples of the analog signal based on the analog-to-digital convertor clock signal.
Dependencies are inferred from the claim text.