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achieving zero TC on a bandgap reference

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ngox

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This is the bandgap reference circuit I am currently using. At present, R14=R15 and M2,M0, and M10 are identical. Bipolar ratio is 1:20. The op-amp has a gain of roughly 35. I am having difficulty achieving zero TC. It seems that no matter how I size the resistors, I end up with a relatively negative TC (around -.63mV/K).

The derived equation I have is Vout = R7[ VBE1/R14 + VTlnN/R0 ]. The expression shows that increasing sizing of R14,15 and decreasing R0 will result in more positive TC, but I cannot seem to get this result through simulation. Ideas anyone?
 

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