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本征电容式传感器和其他高阻抗信号源,通常都需要交流耦合级和隔离放大器来对信号进行初步调节,以便对信号作进一步处理。隔离放大器具有多种形式,但大多数都必须通过为输入偏流提供直流回路的外接电阻
Intrinsically capacitive sensors and other high-impedance signal sources typically require an AC-coupled stage and an isolation amplifier to initially condition the signal for further processing. Isolation amplifiers come in a variety of forms, but most have to pass an external resistor that provides a DC loop for the input bias current