Electronic devices with electromagnetic interference correction

An apparatus, comprising:

• a sensor configured to generate sensor measurements at a given burst rate;
• a comparator configured to output a respective indicator in response to each of the sensor measurements;
• and
• a digital persistence filter configured to determine, based on the respective indicator, whether there is electromagnetic interference in each of the sensor measurements, wherein the digital persistence filter comprises a marked-frame counter that is configured to be reset to a given value and to be clocked at a given frame rate.

An electronic device, comprising:

• a transmitter configured to transmit radio-frequency signals;
• a circuit, comprising:
• a sensor configured to generate sensor measurements;
• and
• a digital persistence filter configured to generate a signal in response to detecting electromagnetic interference in the sensor measurements, wherein the digital persistence filter comprises an up-counter that is configured to be reset to a given value and to be clocked at a given frame rate, wherein the up-counter is configured to be reset to the given value when the sensor measurements are below a threshold, and wherein the up-counter is configured to overflow when the sensor measurements are above the threshold for a period of time longer than the given value divided by the given frame rate;
• and
• control circuitry configured to disregard given sensor measurements in response to the signal.