一般而言扩频通信系统的扩频增益： 2.2 信号耦合电路（Signal Coupling Circuit） 2.2.1 设计目标 信号耦合电路是将载波通信单元与电力线（Powerline）连接的关键单元。
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研究了应用线性光耦合器组成模拟信号隔离电路的设计方法、调试方法以及提高线性度的方法。
The design method, debug method and the method of enhancing degree of linearity are researched in the constituting of analog signal isolating circuit with linear optical couplers.
同直流信号直接耦合处理相比，交流信号耦合虽然要增设调制解调装置，但对后级信号处理电路的器件要求更低，信噪比更高。
Compared with DC coupling signal processing, it need lower requirement of signal processing circuit and have the merit of high signal-to-noise performance although it require the device of modem.
谐振回路耦合至开关电路，接收第一交流信号并产生第二交流信号以给负载供电。
The resonant tank coupled to the switching circuit receives the first AC signal and generating a second AC signal for powering a load.
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