采用电力电子开关功率放大器取代传统的线性功率放大器，极大地减小了装置的体积和重量。
The weight and volume of the power electronics equipment will be minished greatly by using switch-mode power amplifier instead of the traditional linear power amplifier.
对于便携式电子产品来说，运算放大器可算是万能的信号调节电路，因为它可以执行滤波器、放大器、电压感测器、电平移位器、缓冲器、甚至开关等多种不同功能。
Operational amplifier is the most versatile signal conditioning block in any portable system. It can be a filter, an amplifier, an voltage detector, a level shifter, a buffer or even a switch.
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