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well and how critical is matching in your application ?
1) diff pair
- use fingers.
- do not forget about dummies (d)
- common centroid is the best approach (normally). share sources or drains of transistors when possible. you may use simplified structure of common centroid: like 2112. or with...
if u share schematics would be easier to suggest layout strategy.
in general there is no real solution for automatic layout. you can instantiate transistors/res/etc... with already proper dimensions directly from schematic. this will make your life a bit more simple :) however then you would...
according to the schematic you presented you may use:
1) just resistor to vdd (as it was already pointed out by lamoun).
2) if you want to go for something less dependent on Vdd, you may look at Widlar current source or Vth current source. which are simple to implement. the last one is quite...
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