QUALCOMM Incorporated
CAPACITANCE MODULATION TO MITIGATE PIXEL LEAKAGE IN ULTRASONIC SENSORS

Abstract:

Certain aspects of the present disclosure provide apparatus and techniques for capacitance modulation to mitigate pixel leakage in ultrasonic sensors. For example, certain aspects are directed to an ultrasonic sensor including a column line, a pixel having a transistor coupled to the column line, a pixel control circuit coupled to a drain the transistor of the pixel. The ultrasonic sensor may also include a column control circuit coupled to a source of the transistor, wherein at least one of the pixel control circuit or the column control circuit is configured to couple at least one of the drain or the source of the transistor, respectively, to an electric ground during a hold phase of the ultrasonic sensor, and a receiver circuit coupled to the column line.