The datasheets for the LT1498 and RH1498 specify the input offset currents and input offset voltages as strictly positive values. There is a statement in the LT1498 datasheet under the input offset voltage paragraph that "the input offsets are random". There are also two Vos distribution plots under the typical performance characteristics of the LT1498 that shows Vos can be positive or negative. Can we assume that the strictly positive values are simply absolute values and that the input offset current and input offset voltage can be positive or negative and their values are centered around 0A or 0V?
The Offsets written on the spec table is an absolute value.As shown on the distribution plot, there are parts that have + offset and other parts that have - offset.The distribution plot shows what percentage of the devices has a certain offset.
Ideally, the offset is 0.As you can see on the distribution, most of the part or higher percentage, fall near 0.
Thanks and regards.