ACWWong
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A standard CTAT will do. i.e. using a bjt vbe which is about -1~-2mV/oC, you can use an op-amp to make a current in resistor follow this voltage.
So from say 300K to 350K you'll get about a vbe drop of say 700mV to 600mV (obviously depending on technology and current density etc.), which is much better than the 5% you need.
cheers aw
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