Voltage reference with linear negative temperature variation
AssigneeSGS-Thomson Microelectronics S.A.
InventorsSalvatore Scaccianoce, Sergio Palara, Natale Aiello
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Abstract
A bandgap voltage reference circuit employs a Vbe voltage multiplier network in a feedback line of an output amplifier of the bandgap reference circuit, thus permitting to independently fix the output voltage that is produced and the temperature coefficient thereof. A voltage reference having a linear negative temperature coefficient in an extended temperature variation range may be obtained, starting from a bandgap reference voltage with a positive temperature coefficient.
Claims7
A circuit for generating a reference voltage with a negative temperature coefficient from a bandgap voltage with a positive temperature coefficient as generated by a bandgap reference circuit comprising a bandgap voltage generating network and an amplifier, comprising a network consisting of
- at least a Vbe voltage multiplier circuit, functionally connected between an output node of said amplifier and a node at said bandgap voltage of said bandgap voltage generating network,
- at least one resistance connected between said node at bandgap voltage and ground, and
- a resistive voltage divider connected between said output node of said amplifier and ground.
Dependencies are inferred from the claim text.