Please find the circuit attached, we are seeing variation in output voltage at different temperatures. Though the variation is less, it is not acceptable for our requirement.
For a 2V input and Single Supply of 5V, No load condition. The measure output voltage at different temperature is as follows:
Ambient (25C) 2.00328 (1)
Cold (-55C) 1.99936
Hot (110C) 2.00075
For a 2V input and Dual Supply of +/-15V, No load condition. The measure output voltage at different temperature is as follows:
Ambient (25C) 2.00105 (2)
Cold (-55C) 2.00083
Hot (110C) 2.00046
What could be the reason for variation in ambient values, comparing (1) and (2)