Patent ID: 11914812
Assignee: SIGMASENSE, LLC.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 15:
16. A current reference operative drive-sense circuit (DSC) comprising:
a current source operably coupled to a touch screen capacitive load, wherein when enabled, the current source configured to drive a sinusoidal current reference signal to the touch screen capacitive load thereby generating a load voltage that is based on the sinusoidal current reference signal and an impedance of the touch screen capacitive load;
a voltage-mode analog to digital converter (ADC) operably coupled the touch screen capacitive load and to the current source, wherein when enabled, the voltage-mode ADC configured to perform digital sampling of the load voltage and to generate a digital signal that is representative of the load voltage;
memory that stores operational instructions; and
one or more processing modules operably coupled to the voltage-mode ADC and to the memory, wherein, when enabled, the one or more processing modules configured to execute the operational instructions to:
process the digital signal that is representative of the load voltage to determine the load voltage; and
determine the impedance of the touch screen capacitive load based on the load voltage and the sinusoidal current reference signal.