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have a look.. this is the design of bootstrab generator... you can have the current sourse from the diod and Q2 withoutr all other components... so that you do not have delta pulses of current... it's working.. i'm using this method.
Thanx to all reply..But %5 error too big.
There is another Current reference is REF200(from BurrBrown-Texas)
its excellent %0.5 error but difficult to find for me and expensive 5$ each...2.5$ for 1K...
If you would like to get precision temperature measurements, maybe it would be better to use "poor" tempco current source, and connect RTD in series with stable resistor. Then measure resistor voltage drop, calculate current -> RTD -> temperature