Abstract-Due to continuous scaling in modern process
technologies, more and more analog and mixed-signal
circuits are integrated with digital units to realize system
on-a-chip. Since analog designs generally need
comprehensive analysis to ensure circuit performances, it
usually requires more development time to implement
analog blocks than digital ones. Because of the difficulties
in analog designs and the lack of support by design
automation tools, analog circuits become bottleneck in the
chip design flow. Although some studies have been
proposed to consider placement of analog circuits recently
they usually ignore routing problems. In this paper, some
issues about placement and routing for analog circuits are
discussed, which include prevention of noisy signals in
symmetry islands, congestion elimination in practical
placement, and routing area reduction in capacitor arrays
By considering placement and routing at the same time,
the routing-induced problems which may cause unwanted
effects to deteriorate analog layout quality can be
prevented.