Synaptics Incorporated
Background capacitance compensation

Abstract:

A processing system comprises sensor circuitry and a baseline correction mechanism. The sensor circuitry comprises a receiver channel having an input configured to acquire a resulting signal from a sensor electrode. A background capacitance is formed between the sensor electrode and a conductive element. The baseline correction mechanism is coupled to the input of the receiver channel. The baseline correction mechanism comprises a resistive element configured to be driven with a compensation signal to at least partially mitigate the background capacitance.