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    • 7. 发明申请
    • DIFFERENTIAL MODE SENSING ARRANGEMENT
    • 差分模式感应装置
    • WO2009077759A1
    • 2009-06-25
    • PCT/GB2008/004175
    • 2008-12-17
    • UCL BUSINESS PLCRAHAL, MohamadDEMOSTHENOUS, Andreas
    • RAHAL, MohamadDEMOSTHENOUS, Andreas
    • G01D3/032G01D5/20G01D3/028
    • G01D5/2073G01D3/032
    • A new architecture front-end for electronic sensing is introduced. The architecture utilizes a fully differential synchronous detector to modulate the received signal. A first chopping circuit is used to modulate the offset of a fully differential amplifier. A second chopping circuit is used to demodulate the outputs from the amplifier to remove its offset. The new architecture does not require the offset to be measured before a measurement is taken as in the prior art through the use of microcontroller based system. The amplifier employed is fully differential and does not require any feedback components thus increasing the ability to reject interference and common mode signals. The architecture is also immune to the impedance imbalances at the front end by employing cross- coupled synchronous detector arrangement. The architecture can be employed in various applications where the detection of low-level signals with specific frequency contents is required.
    • 介绍了电子感应的新架构前端。 该架构使用全差分同步检波器来调制接收信号。 第一斩波电路用于调制全差分放大器的偏移。 第二斩波电路用于解调来自放大器的输出以去除其偏移。 新架构不需要在通过使用基于微控制器的系统在现有技术中进行测量之前测量偏移。 所使用的放大器是完全差分的,并且不需要任何反馈分量,因此增加了抑制干扰和共模信号的能力。 该架构还通过采用交叉耦合同步检波器布置,免于前端的阻抗不平衡。 该架构可以用于需要检测具有特定频率内容的低电平信号的各种应用中。