对系统总体设计方案进行了研究分析，硬件设计中详细介绍了控制回路的电流检测模块、电机转速和位置检测模块、PWM输出和故障输入电路。
The overall design scheme is researched. The hardware of current detection module, motor speed and location detection module and PWM output and fault input module is introduced in detail.
输出缓冲器包括差动输入级、偏压电流源、反馈模块以及输出级。
The output buffer includes a differential input stage, a bias current source, a feedback module, and an output stage.
偏压模块提供偏压电流至差动输入级。
The bias module provides a bias current to the differential input stage.
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