US 11,868,565 B2
Systems, methods, and devices for capacitive sensing with sinusodial demodulation
Viktor Kremin, Lviv (UA); Oleksandr Pirogov, Lviv (UA); Vadym Grygorenko, Lviv (UA); and Jens Weber, Pinneberg (DE)
Assigned to Cypress Semiconductor Corporation, San Jose, CA (US)
Filed by Cypress Semiconductor Corporation, San Jose, CA (US)
Filed on Apr. 15, 2022, as Appl. No. 17/722,200.
Application 17/722,200 is a continuation of application No. 17/127,760, filed on Dec. 18, 2020, granted, now 11,307,712.
Claims priority of provisional application 63/006,298, filed on Apr. 7, 2020.
Prior Publication US 2023/0280862 A1, Sep. 7, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 3/041 (2006.01); G06F 3/044 (2006.01)
CPC G06F 3/04182 (2019.05) [G06F 3/044 (2013.01); G06F 3/04166 (2019.05)] 17 Claims
OG exemplary drawing
 
1. A device comprising:
a sensing channel comprising an attenuator, the attenuator to receive an input signal from at least one sense electrode; and
a signal generator coupled to the attenuator, wherein the signal generator is:
to generate a rectified sinusoidal signal to modulate a gain of the attenuator,
to 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,
to generate the rectified sinusoidal signal based on the sinusoidal signal, and
to provide the rectified sinusoidal signal to the attenuator during the scan sequence; and
wherein the attenuator is configured to multiply the input signal with the rectified sinusoidal signal to reduce a noise characteristic of the input signal.