Patent ID: 11868565
Assignee: CYPRESS SEMICONDUCTOR CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 14:
15. A system comprising:
a plurality of sense electrodes implemented in a capacitive sensing device;
a plurality of transmit electrodes implemented in the capacitive sensing device; and
an attenuator configured to receive an input signal from at least one of the plurality of sense electrodes, the attenuator being included in a sensing channel of a capacitive sensor; and
a signal generator coupled to an input of the attenuator, the signal generator is configured to:
generate a rectified sinusoidal signal to modulate a gain of the attenuator,
generate a sinusoidal signal based, at least in part, on one or more noise characteristics of a scan sequence associated with one or more transmit electrodes of the capacitive sensing device;
generate the rectified sinusoidal signal based on the sinusoidal signal; and
provide the rectified sinusoidal signal to the attenuator during the scan sequence;

wherein the attenuator is configured to multiply the input signal with the rectified sinusoidal signal to reduce a noise characteristic of the input signal; and
a controller configured to implement a scan sequence and obtain a plurality of measurements based on the scan sequence.