By using a series and shunt combination of optocouplers the attenuator can be configured to produces a constant input and output impedance, regardless of where the voltage control setting is.
通过使用光耦衰减器的串联和分流相结合可以配置成恒定的输入和输出阻抗，而与控制电压无关。
The method for setting the operation mode of the chip includes that: the element is connected at the bias voltage end of the output driver;
设定芯片操作模式的方法包括：连接元件在输出驱 动器的偏压端；
The method for setting the operation mode of the chip includes that: the element is connected at the bias voltage end of the output driver;
设定芯片操作模式的方法包括：连接元件在输出驱 动器的偏压端；
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