公开(公告)号：US20250007533A1

公开(公告)日：2025-01-02

申请号：US18740664

申请日：2024-06-12

Applicant: SILEAD INC.

Inventor： Jinling ZHOU ,  Jun YANG ,  Hongzhen CHEN

IPC: H03M3/00 ,  G06F3/041

Abstract: A touch detection circuit, a touch sensing chip and an electronic device are disclosed. The touch detection circuit includes: a charge/discharge circuit, a 1st-order N-bit ΔΣADC comprising an adder, an integrator, an N-bit ADC and an N-bit DAC, the adder comprising two input terminals coupled respectively to an output terminal of the charge/discharge circuit and an output terminal of the N-bit DAC, the N-bit DAC comprising an input terminal coupled to an output terminal of the N-bit ADC, wherein the integrator is configured to integrate net incoming charge that the integrator receives; the N-bit ADC is configured to quantize an output of the integrator into an N-bit digital signal; the N-bit DAC is configured to provide subtractive reference charge according to the instruction of the N-bit digital signal; and the adder is configured to derive the net incoming charge by subtracting the subtractive reference charge from the sense charge.

公开(公告)号：US20230138208A1

公开(公告)日：2023-05-04

申请号：US17724613

申请日：2022-04-20

Applicant: SILEAD INC.

Inventor： Wukang ZHANG ,  Weiguo LI ,  Jun YANG

IPC: G06F3/041 ,  G06F3/044

Abstract: The present invention relates to a touch detection device, an electronic apparatus and a touch detection method. Each frame of touch related data corresponding to n*m capacitive nodes is obtained by producing n*m coupled signals from encoding operations and subjecting the n*m coupled signals to multiple access accumulation process, common mode suppression process, ADC process and decoding processes. Additionally, touch location information of the n*m capacitive nodes is obtained by acquiring two consecutive frames of touch related data and performing a subtraction operation between the two consecutive frames of touch related data. Therefore, relatively high touch sensing sensitivity is achievable. Before the subtraction operation, common-mode analog voltage amounts subtracted in the common mode suppression process may be not added back for each single frame of touch related data obtained from decoding process. This avoids introduction of errors, as well as a larger circuitry area and increased power consumption.