Voltage reference

摘要

A voltage reference circuit includes a bipolar transistor and a circuit configured to measure the ratio of emitter current to base current of the bipolar transistor. The output voltage of the voltage reference circuit is compensated as a function of the measured ratio.

主权项

1. A voltage reference circuit having an output voltage, the circuit comprising:
a bipolar transistor having a base and an emitter; a circuit configured to measure the ratio of emitter current to base current of the bipolar transistor; the output voltage being compensated as a function of the measured ratio; the bipolar transistor being a third bipolar transistor, the circuit further comprising: first and second bipolar junction transistors having different current densities; where the third bipolar junction transistor is driven with the same current density as one of the first and second bipolar junction transistors; where the third bipolar transistor is alternately driven with the current density of the first bipolar transistor and the current density of the second bipolar transistor.