| 摘要 |
Differential amplifier apparatus comprises a summing and inverting network for developing an output signal of which the magnitude is proportional to the common mode component of an input signal received at first and second input terminals of the apparatus and of which the polarity is opposite the polarity of the common mode component. A summing network is connected to the first and second input terminals and to the output of the summing and inverting network and has first and second intermediate nodes. A first differential amplifier has a non-inverting input connected to a first intermediate node of the summing network, and a second differential amplifier has a non-inverting input connected to the second intermediate node of the summing network. A bridging resistor is connected between the inverting inputs of the first and second differential amplifiers.
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