Bandgap voltage reference using a power supply independent current source.

摘要

A voltage reference circuit (10) is providing for developing an output voltage operating independent of temperature and power supply variation. A current reference circuit (12) provides a current reference signal operating independent of power supply variation and having a predetermined temperature coefficient and flowing through a first transistor (20) and a first resistor (22) each having opposite temperature coefficients. The output voltage is established as the sum of the base-emitter junction potential of the first transistor and the potential developed across the first resistor. The temperature coefficient of the potential developed across the first resistor substantially cancels the temperature coefficient across the base-emitter junction of the first transistor thereby providing the output voltage operating independent of temperature and power supply variation. <IMAGE>