公开(公告)号：US10270459B2

公开(公告)日：2019-04-23

申请号：US15827179

申请日：2017-11-30

Applicant: SHENZHEN GOODIX TECHNOLOGY CO., LTD.

Inventor： Shuo Fan

IPC: H03M1/00 ,  H03M1/46

Abstract: The present disclosure relates to a method for reducing power consumption, including: connecting one terminal of each capacitor in a first and a second capacitor array of an SAR ADC to a first reference voltage via a corresponding primary switch, connecting the other terminal of the capacitors to a positive-terminal analog input signal and a negative-terminal analog input signal respectively via a corresponding multiplexer to complete sampling; determining a value of a most-significant bit by comparing an output voltage of the first capacitor array with an output voltage of the second capacitor array, maintaining or adjusting a reference voltage connected to the other terminal of each capacitor according to the value of the most-significant bit, and determining values of a second-most-significant bit and a least-significant bit by comparing the output voltage of the first capacitor array with the output voltage of the second capacitor array.

公开(公告)号：US20180150157A1

公开(公告)日：2018-05-31

申请号：US15879760

申请日：2018-01-25

Applicant: SHENZHEN GOODIX TECHNOLOGY CO., LTD.

Inventor： Shuo Fan

IPC: G06F3/044 ,  G06K9/00 ,  G06F3/041

CPC classification number: G06F3/044 ,  G06F3/0412 ,  G06F3/0418 ,  G06K9/0002 ,  G06K9/00087

Abstract: The present disclosure relates to a capacitance variation detection circuit, a touch screen and a touch detection method. The method includes: connecting one terminal of a detection capacitor and one terminal of a denoising capacitor to a first power simultaneously, and connecting the other terminal of the detection capacitor and the other terminal of a denoising capacitor to a reference ground simultaneously; disconnecting the detection capacitor from the first power source and connecting it to the negative input terminal of the operation amplifier, switching the one terminal of the denosing capacitor from being connected to the first power source to being connected to the reference ground, and connecting the other terminal of the denoising capacitor to the negative input terminal of the operational amplifier; and acquiring an output result of the operational amplifier, and judging whether there is a touch operation according to the output result.

公开(公告)号：US20180115317A1

公开(公告)日：2018-04-26

申请号：US15784514

申请日：2017-10-16

Applicant: SHENZHEN GOODIX TECHNOLOGY CO., LTD.

Inventor： Shuo Fan

IPC: H03M1/00

CPC classification number: H03M1/002 ,  H03M1/462 ,  H03M1/468

Abstract: This disclosure discloses a DAC capacitor array, which includes a plurality of sub-capacitor arrays that are connected in parallel. Each sub-capacitor array includes: a capacitor group, including N capacitors connected in parallel, N being a positive integer; and a primary switch and a plurality of multiplexers; wherein one terminal of each capacitor in the capacitor group is connected to an input terminal of a comparator, and is connected to an input source via the primary switch; and the other terminals of the capacitors in the capacitor group are connected to a plurality of input sources via corresponding multiplexers respectively. The DAC capacitor array is optimized by adjusting the reference voltage to which the capacitors in the DAC capacitor array are connected, which reduces the overall capacitance of the DAC capacitor array.