Tako
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Sorry for late reply.
In general CMOS analog IC design (comparators, opamps single-to-hundreds MHz bandwidth, bandgaps etc.), generally W/L > 1 or even W/L >> 1. For example, a single transistor may be 10/2 um in 0.18 um technology.
Minimum and maximum dimensions depends on the technology, but generally Wmin is slightly larger than Lmin, e.g. 0.22/0.18 um.
You may choose W/L < 1 or even W/L << 1, especially in transistor which works as resistor (current source reference, RC filter), e.g.: 0.5 / 10 um.
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