Patent ID: 11962323
Assignee: SIGMASENSE, LLC.
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 17:
18. The batteryless wireless sensor device of claim 17, wherein:
the ADC configured to generate the sensor data based on a sensor voltage of the sensor that corresponds to a physical condition to which the sensor is exposed;
the sensor data is output from the ADC based on digital sampling of the sensor voltage of the sensor by the ADC;
the ADC is coupled to the sensor via a single line, and wherein the sensor voltage is based on charging of a capacitor of the ADC by a sensor current of the sensor and a digital to analog converter (DAC) output current from the ADC; and the ADC further comprising:
the capacitor operably coupled to the sensor and configured to produce the sensor voltage based on charging by the sensor current and the DAC output current;
a comparator operably coupled and configured to:
receive the sensor voltage via a first input of the comparator;
receive a reference voltage via a second input of the comparator; and
compare the sensor voltage to the reference voltage to generate a comparator output signal;

a digital circuit operably coupled and configured to process the comparator output signal to generate a first digital output signal that is representative of a difference between the sensor voltage and the reference voltage;
memory that stores operational instructions;
one or more processing modules operably coupled to the digital circuit and the memory and configured to execute the operational instructions to process the first digital output signal to generate a second digital output signal that is representative of the difference between the sensor voltage and the reference voltage, wherein the second digital output signal includes a higher resolution than the first digital output signal; and
an N-bit digital to analog converter (DAC) that is operably coupled to the one or more processing modules and configured to generate the DAC output current based on the second digital output signal, wherein N is a positive integer, the DAC output current tracks the sensor current, and the sensor voltage tracks the reference voltage.