Bandgap voltage regulator

Details Bandgap voltage regulator Bandgap voltage regulator

2007-04-24

2007-04-24

Sterrett, Jeffrey (Department: 2838)

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

C323S907000

Reexamination Certificate

active

11033058

ABSTRACT:
A bandgap voltage regulator is arranged such that, when a desired output voltage is present between its output and common terminals, current densities in a pair of bipolar transistors having unequal emitter areas are maintained in a fixed ratio. The difference in the transistors' base-emitter voltages is across a resistor, which thus conducts a PTAT current. The regulator also generates a CTAT current, and both the PTAT and CTAT currents are made to flow in another resistor, with the resulting voltages added by superposition. The regulator's resistors are sized such that Voutis an integral or fractional multiple of Vbg, where Vbgis the bandgap voltage for the fabrication process used to make the regulator's transistors, such that Voutis temperature invariant, to a first order. The resistors are preferably realized using unit resistors having a predetermined resistance, or series and/or parallel combinations of unit resistors.

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Band-Gap-Referenced Biasing Circuits, Analysis and Design of Analog Integrated Circuits, Third Edition, pp. 338-346; Published 1942, Copyright 1993, Paul R. Gray/Robert G. Meyer.

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