eeprom circuit, spannungsreferenzschaltung and procedures for management of a spannungsreferenz with low temperaturkoeffizient

摘要

A voltage reference circuit (40) is provided for producing a low temperature-coefficient analogue trim value. A pair of EEPROMs (50 and 60) are arranged such that the trim value is the difference between two EEPROM transistor threshold voltages. The substantially temperature dependent components of threshold voltage cancel out leaving only the substantially temperature independent trim value. Therefore the temperature coefficient of the voltage reference circuit (40) is negligible. IMAGE