voltage reference ouput vary with the temp

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rock_zhu

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I used the basic reference configuration as Razavi's book. I think the normal result of ouput voltage may be like the fig"normal". The second fig is my simulation result. I tried to vary the resistor ratio but can't get the curve like "normal" one. can you tell me what's the problem? thanks
 

It is not a wrong case, the shape depends on the temperature coefficient of the resistor, the opamp offset, and the current mirror. Ur concern should be the temperature coefficient of the reference voltage
 

    rock_zhu

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