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BJT are non-linear components by nature, so you can at best approximate a linear resistor charactericstic within a certain range. Or create the linear characteristic with the help of a feedback loop.
A detailed parameter specification would be the first step.
As you probably know - a JFET is able to provide a resistive channel around the origin (for both current directions).
Do you want to realize something similar with npn transistors ? This is not possible.
More than that, you should tell us if you want to realize a static or (only) a dynamic/differential resistance?
I read in literature that they are resistance circuit with CMOS transistors, but i work in a project with NPN transistors, so i need to replace my passive resistance with others active.
I think, there are applications where the collector emitter path of a well biased BJT acts as a load resistance for another transistor - however, it is a dynamic resustance only (and not a kind of "ohmic" resistor).
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