极性开关 meaning in English

polarity switch

To improve the performance of the system , some methods are introduced , such as photoelectric brightness modulating , amplification of the photoelectric ac signal and filter design . the circuitry of the demodulator is also presented . this work lays solid foundation for the future system integration
最后，介绍了数字式加速度计的参考电路设计，其中重点介绍了数字式再平衡回路的设计，包括脉宽调制、恒流源、极性开关等电路的设计。