针对采用的生物传感器内阻高、信号弱、双极性等特点，用预处理电路对模拟信号进行了变换。
A preprocessing circuit is designed for analog signal transformation because of large inner impedance of biosensor and bipolar signal.
应用双极性脉冲传输信号。避免了因远距离电缆充、放电带来的波形畸变。
Application of bipolar pulse in transmitting signal can avoid distorted wave caused by charge or discharge in a long cable.
结合电力操作电源的特性，建立了基于有限双极性控制的操作电源的小信号模型，并设计了控制电路。
In this paper, the small signal modeling of the electric rectifier based on limited double poled control scheme is presented, and the control loop circuit is designed.
AD7324可处理真双极性模拟输入信号。
L 297芯片产生脉宽可调的脉冲相序信号，该信号作为双极性桥式功率驱动电路的输入信号，放大后驱动步进电机。
L297 chip generates pulse phase sequence signals of which the pulse width is adjustable. The signals are the input ones of dual bridge driving circuit and drive the stepper motor after amplification.
L 297芯片产生脉宽可调的脉冲相序信号，该信号作为双极性桥式功率驱动电路的输入信号，放大后驱动步进电机。
L297 chip generates pulse phase sequence signals of which the pulse width is adjustable. The signals are the input ones of dual bridge driving circuit and drive the stepper motor after amplification.
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