公开(公告)号：US20130057301A1

公开(公告)日：2013-03-07

申请号：US13224144

申请日：2011-09-01

申请人： Ganesh Balachandran ,  Vladimir Petkov

发明人： Ganesh Balachandran ,  Vladimir Petkov

IPC分类号： G01R27/26

CPC分类号： G01P15/125 ,  G01P15/0802 ,  Y10T29/49117

摘要： 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.

摘要翻译： 公开了电容式传感器系统，其减少由馈通电容或残余静电力引起的非线性。 该系统可以包括具有耦合到第一可变电容器的第一输入的第一输入和耦合到第二可变电容器的第二输入以及耦合到公共节点的核心输出的核心; 具有可转换地耦合到公共节点和输出的输入的放大器; 反馈路径将放大器输出切换耦合到公共节点; 以及具有第一和第二相的主时钟，用于控制开关耦合系统组件。 当时钟处于第一阶段时，第一个核心输入耦合到参考电压，第二个核心输入耦合到负参考电压，而公共节点耦合到放大器输出。 当时钟处于第二阶段时，核心输入端接地，公共节点耦合到放大器输入端。 该系统可以有单个放大器。 中和电容可以消除馈通和寄生电容。

公开(公告)号：US20130049525A1

公开(公告)日：2013-02-28

申请号：US13220306

申请日：2011-08-29

申请人： VLADIMIR PETKOV ,  Ganesh Balachandran

发明人： VLADIMIR PETKOV ,  Ganesh Balachandran

IPC分类号： H02N1/08

CPC分类号： G01P15/125 ,  G01D5/24 ,  G01L1/144 ,  Y10T29/4913

摘要： A capacitive transducer and a readout circuit for processing a signal from a capacitive transducer. The readout circuit includes a high gain circuit element, two summing amplifiers and two feedback path. The high gain circuit element generates an amplified transducer signal, and the summing amplifiers sum the amplified transducer signal with a positive reference voltage and the negative reference voltage, respectively, to generate a first summation signal and a second summation signal. The feedback paths feed back the summation signals to the transducer. Output circuitry generates an output signal based on the summation signals. The high gain circuit element can be a a switched capacitor integrator. The output circuitry can generates the output signal based on the first and second summation signals.

摘要翻译： 一种用于处理来自电容式换能器的信号的电容式换能器和读出电路。 读出电路包括高增益电路元件，两个求和放大器和两个反馈路径。 高增益电路元件产生放大的换能器信号，并且求和放大器将放大的换能器信号分别与正参考电压和负参考电压相加，以产生第一求和信号和第二求和信号。 反馈路径将求和信号反馈到换能器。 输出电路根据求和信号产生输出信号。 高增益电路元件可以是开关电容器积分器。 输出电路可以基于第一和第二求和信号产生输出信号。