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针对传感器对性能参数要求的增高,为解决传感器受斩波温漂和瞬变尖峰所带来的影响,以平衡式差动斩波器电路在传感器中的应用为例,阐述平衡式差动斩波器电路的工作原理及其和连接在差动斩波器电路输出端上的隔离放大器应用。介绍了差动斩波器电路的基本结构,并通过详述FET串-并联斩波器和差动斩波器工作原理,分析它在温漂特性中的优势和特点。结果表明,平衡式差动斩波器电路在使用中抵消由斩波器温漂和瞬变尖峰所带来影响的优点。
In order to solve the problem of the sensor being affected by the chopper temperature drift and the transient spike, the application of the balanced differential chopper circuit in the sensor is taken as an example to explain the requirements of the sensor for the performance parameter increase. The working principle of the filter circuit and its application to the isolation amplifier connected to the output of the differential chopper circuit. The basic structure of the differential chopper circuit is introduced. And the working principle of the FET series - shunt chopper and differential chopper is described in detail, and its advantages and characteristics in the drift characteristics are analyzed. The results show that balanced differential chopper circuits offset the benefits of chopper temperature drift and transient spikes in use.