Precision ADC sampling clock for high accuracy wireless guided wave radar
AssigneeRosemount Inc.
InventorEric Russell Lovegren
Life of this patent
Estimating the term…
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.
Claims8
A level transmitter comprising:
- an analog-to-digital converter clock signal generator that receives a transmitter clock signal and a start signal and uses the received transmitter clock signal to generate an analog-to-digital converter clock signal, where the transmitter clock signal is used to establish when an incident signal is transmitted toward a material boundary wherein the analog-to-digital converter clock signal generator comprises at least one logic gate and a counter, the at least one logic gate receiving the transmitter clock signal and the start signal and forming a counter clock signal that is provided to a clock input of the counter, the logic gate forming the counter clock signal such that the counter clock signal tracks the transmitter clock signal after a transition in the start signal;
- an analog-to-digital converter that samples an analog waveform based on the analog-to-digital converter 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 level transmitter comprising:
- an incident signal generator that receives a transmitter clock signal and transmits an incident signal toward a material;
- a dedicated analog-to-digital converter clock generator that receives the transmitter clock signal and a start signal, that generates a counter clock signal that tracks the transmitter clock signal after a transition in the start signal, and that uses the counter clock signal to drive a counter that generates an analog-to-digital converter 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 converter clock signal and produces digital samples of the analog signal based on the analog-to-digital converter clock signal.
Dependencies are inferred from the claim text.