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Periodic orbit quantization requires an analytic continuation of
non-convergent semiclassical trace formulae.
We propose a method for semiclassical quantization based upon
the Padé approximant to the periodic orbit sums.
The Padé approximant allows the re-summation of the typically
exponentially divergent periodic orbit terms.
The technique does not depend on the existence of a symbolic dynamics
and can be applied to both bound and open systems.
Numerical results are presented for two different systems with chaotic
and regular classical dynamics, viz. the three-disk scattering system
and the circle billiard
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