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摘要：单位增益运放缓冲而不需要为偏置电阻，电容传感器和其他高阻抗信号源。Maxim > App Notes > AMPLIFIER AND COMPARATOR CIRCUITS
Keywords: rail to rail op amp, wide input common mode range, opamps Aug 27, 2001
APPLICATION NOTE 781
AC-Coupled Amplifier Requires No DC Bias
Abstract: Unity gain op amp buffers capacitive transducer and other high-impedance signal sources without the
need for bias resistors.
Capacitive transducers and other high-impedance signal sources usually require AC coupling and a buffer
amplifier to condition the signal. Buffers take many forms, but most of them compromise signal quality through
external resistors which provide a DC path for the input bias current. Fortunately, recent improvements in op
amp technology allow AC-coupled inputs without the need for bias resistors.
These new op amps have inpu
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