SENSING UNIT FOR MEASURING STIMULATION IN A BODY

A sensing unit for use in a body includes a variable impedance circuit for connecting to a distal end of a transmission line and reflecting a carrier signal received from the transmission line. The variable impedance circuit includes a variable impedance component having an impedance that varies non-linearly with an applied voltage, a sensor for generating a voltage in response to a stimulus, and a voltage bias system for creating a voltage bias for the variable impedance component. The voltage bias sets an operating point of the variable impedance element such that a change in voltage from the sensor changes the impedance of the variable impedance element non-linearly. 一种用于在身体中使用的感测单元包括可变阻抗电路，所述可变阻抗电路用于连接到传输线的远端并反射从所述传输线接收的载波信号。可变阻抗电路包括具有随施加的电压非线性变化的阻抗的可变阻抗部件、用于响应于刺激而生成电压的传感器以及用于为可变阻抗部件创建电压偏置的电压偏置系统。所述电压偏置设置可变阻抗元件的操作点，使得来自传感器的电压变化非线性地改变可变阻抗元件的阻抗。