| 摘要 |
<p>The apparatus includes an operational amplifier (56) which has inverting (72) and non-inverting (70) inputs and an output (74) that is a function of the voltage at the inverting and non-inverting inputs (72-70). An attenuator network (54) is connected to the operational amplifier (56). The attenuator network (54) includes circuitry for reducing a voltage of a first value at the inputs (62, 64) of the attenuator network (54) to a voltage that is a fraction of the first value at the output of the attenuator network (54) which voltage is then transmitted to the operational amplifier (56) inputs (70, 72). The attenuator network (54) includes additional circuitry (66) for reducing a common-mode feed-through voltage of a second value at the inputs (62, 64) ot the attenuator network (54) to a common-mode feed-through voltage that is a fraction of the second voltage at the output of the operational amplifier (56).</p> |
