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公开(公告)号：US10353511B2
公开(公告)日：2019-07-16
申请号：US15271131
申请日：2016-09-20
Applicant: QUALCOMM Incorporated
Inventor： Bo-Ren Wang , Lennart Mathe , Sameer Wadhwa , Nathan Altman , Sandeep D'Souza
IPC: G06F3/041 , G06F3/044 , G06K9/00 , H03K17/955 , H03K17/96
Abstract: The present disclosure describes aspects of a capacitance-to-voltage modulation circuit. In some aspects, the circuit is used in touch sensing. In some aspects, a modulation circuit comprises a first pair of switches having one switch connected between a voltage source and a capacitor, and another switch connected between ground and the input of the circuit. The circuit also includes a second pair of switches having one switch connected between the voltage source and the input of the circuit, and another switch connected between ground and the capacitor. A third pair of the circuit's switches comprise one switch connected between the capacitor and an input of an analog-to-digital converter (ADC) and another switch connected between the input of the circuit and the input of the ADC. The third pair of switches may enable charge sharing of signals modulated by the first and second pairs of switches, a result of which can be used to sense touch input based on capacitance at the input of the circuit.
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公开(公告)号：US20200156108A1
公开(公告)日：2020-05-21
申请号：US16194181
申请日：2018-11-16
Applicant: QUALCOMM Incorporated
Inventor： Shitong Zhao , Masoud Roham , Lennart Mathe , Bo-Ren Wang
Abstract: A voltage burst is generated using a voltage supply having a single DC output voltage, VH coupled with a switching arrangement, including an input and a voltage transmitter output (Tx_Out), the input coupled with the output of the voltage supply. A control arrangement coupled with the switching arrangement is configured to operate the switching arrangement so as to provide, at the Tx_Out, a voltage burst that varies between an intermediate voltage, VM, and one or both of VH, and a minimum voltage, VL, where VL
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