Invention Grant
US08823398B2 Linear capacitance-to-voltage converter using a single amplifier for transducer front ends with cancellation of spurious forces contributed by sensor circuitry
有权
线性电容 - 电压转换器使用传感器前端的单个放大器,并消除传感器电路造成的杂散力
- Patent Title: Linear capacitance-to-voltage converter using a single amplifier for transducer front ends with cancellation of spurious forces contributed by sensor circuitry
- Patent Title (中): 线性电容 - 电压转换器使用传感器前端的单个放大器,并消除传感器电路造成的杂散力
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Application No.: US13551652Application Date: 2012-07-18
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Publication No.: US08823398B2Publication Date: 2014-09-02
- Inventor: Ganesh Balachandran , Vladimir Petkov
- Applicant: Ganesh Balachandran , Vladimir Petkov
- Applicant Address: DE Stuttgart
- Assignee: Robert Bosch GmbH
- Current Assignee: Robert Bosch GmbH
- Current Assignee Address: DE Stuttgart
- Agency: Maginot, Moore & Beck
- Main IPC: G01R27/26
- IPC: G01R27/26 ; G01P15/125 ; G01P15/08

Abstract:
Capacitive transducer systems are disclosed that reduce nonlinearities due to feedthrough capacitances or residual electrostatic forces. The systems can include a core with a first input coupled to a first variable capacitor, a second input coupled to a second variable capacitor, and a core output coupled to a common node; an amplifier with input switchably coupled to common node and an output; a feedback path switchably coupling amplifier output to common node; and a main clock with first and second phases, that controls switches coupling system components. When clock is in first phase, first core input is coupled to reference voltage, second core input is coupled to negative reference voltage, and common node is coupled to amplifier output. When clock is in second phase, core inputs are grounded, and common node is coupled to amplifier input. The system can have single amplifier. Neutralization capacitor can cancel feedthrough and parasitic capacitances.
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