  Chaos synchronization in one of charge-carrier dynamical systems in
photoconductors is studied within both the replica and nonreplica approaches.It
has been shown that using the boundedness of the solutions of the dynamical
systems, nonreplica approach to chaos synchronization and Routh-Hurwitz
criteria, it is possible to make negative all the conditional Lyapunov
exponents without complex numerical and analytical calculations.
