| 摘要 |
The apparatus includes an operational amplifier which has inverting and non-inverting inputs and an output that is a function of the voltage at the inverting and non-inverting inputs. An attenuator network is connected to the operational amplifier. The attenuator network includes circuitry for reducing a voltage of a first value at the inputs of the attenuator network to a voltage that is a fraction of the first value at the output of the attenuator network which voltage is then transmitted to the operational amplifier inputs. The attenuator network includes additional circuitry for reducing a common-mode feed-through voltage of a second value at the inputs of the attenuator network to a common-mode feed-through voltage that is a fraction of the second voltage at the output of the operational amplifier.
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