sheldon
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Jockey,
First you are using pnp transistors not npn transistors. Next, a few questions: 1) Why do it this way? Why not two current sources of the same value and size one of the pnp transistors?
2) Next you are operating these transistors at very low current density, have you checked the p-channels models subthreshold characteristics?
3) Again, why are you performing transient analysis on this circuit? You are just looking at the temperature tracking, then dc analysis is all you need. For example, when performing a similar analysis of a bandgap reference, only need to run dc in order to verify trimming ranges.
4) What other parameters are you tracking in your analysis? For example, how much head room do the current source have? Is there any reason that the circuit is might be having issues setting up? Looking at your schemtic, it does not seem like there should be any issue, but it might be worth checking.
Sheldon
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