Invention Grant
- Patent Title: Attenuator circuit of a capacitance-sensing circuit
- Patent Title (中): 电容感应电路的衰减器电路
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Application No.: US14096978Application Date: 2013-12-04
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Publication No.: US08866494B2Publication Date: 2014-10-21
- Inventor: Andriy Ryshtun , Victor Kremin , Mykhaylo Krekhovetskyy , Ruslan Omelchuk
- Applicant: Cypress Semiconductor Corporation
- Applicant Address: US CA San Jose
- Assignee: Cypress Semiconductor Corporation
- Current Assignee: Cypress Semiconductor Corporation
- Current Assignee Address: US CA San Jose
- Main IPC: G01R1/44
- IPC: G01R1/44 ; G06F3/041 ; G06F3/0354 ; G06F3/044

Abstract:
Apparatuses and methods of input attenuator circuits are described. One sensing circuit includes an attenuator circuit to receive a signal from an electrode of a sense array. The attenuator circuit is configured to attenuate input current of the signal. The attenuator circuit includes an attenuation matrix including an input terminal to receive the signal and multiple resistors. The attenuation matrix is configured to split the input current into an output current of the attenuation signal on a first output terminal and a second output current on a second output terminal. The attenuation matrix is to output the attenuated signal on the first output terminal to an integrator of the sensing circuit. The attenuator circuit also includes a buffer coupled between the attenuation matrix and the integrator. The buffer is configured to maintain a substantially same voltage at the first output terminal and the second output terminal.
Public/Granted literature
- US20140267151A1 ATTENUATOR CIRCUIT OF A CAPACITANCE-SENSING CIRCUIT Public/Granted day:2014-09-18
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