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Неуж прям-таки на затворы усилителя подают? В смысле долговременной стабильности...
Например у ADR01-ADR06 даётся 50ppm за 1000 часов, но есть приписка, что эта погрешность не накапливается. А у REF02 от "TI" - 100 за первыую тысячу и 50 за вторую.
1ppm/°C, 5.0V, Precision Low-Power FGA™ Voltage Reference
FEATURES
• Ultra-Low Temperature Coefficient: 1ppm/°C
• Absolute Initial Accuracy: ±0.5mV
• 10ppm Thermal Hysteresis
• Long Term Stability: 10ppm/1,000Hrs
FGA Technology
The X60008 series of voltage references use the floating gate technology to create references with very low drift and supply current. Essentially the charge stored on a floating gate cell is set precisely in manufacturing. The reference voltage output itself is a buffered version of the floating gate voltage. The resulting reference
device has excellent characteristics which are unique in the industry: very low temperature drift, high initial accuracy, and almost zero supply current. Also, the reference voltage itself is not limited by voltage bandgaps or zener settings, so a wide range of reference
voltages can be programmed (standard voltage settings are provided, but customer-specific voltages are available).
The process used for these reference devices is a floating gate CMOS process, and the amplifier circuitry uses CMOS transistors for amplifier and output transistor circuitry. While providing excellent accuracy, there are limitations in output noise level and load regulation due to the MOS device characteristics. These limitations are addressed with circuit techniques discussed in other sections.
И вот тоже прикольный пункт (очень напоминает давнее обсуждение механической нестабильности Далласовских термометров):
Board mounting Considerations
For applications requiring the highest accuracy, board mounting location should be reviewed. Placing the device in areas subject to slight twisting can cause degradation of the accuracy of the reference voltage due to die stresses. It is normally best to place the device near the edge of a board, or the shortest side, as the axis of bending is most limited at that location. Obviously mounting the device on flexprint or extremely thin PC material will likewise cause loss of
reference accuracy.
E-mail: 
info@telesys.ru
