US 12,287,663 B2
Bandgap circuit
Vratislav Michal, Fontanil-Cornillon (FR); and Regis Rousset, Corenc (FR)
Assigned to STMicroelectronics (Grenoble 2) SAS, Grenoble (FR); and STMicroelectronics (Alps) SAS, Grenoble (FR)
Filed by STMicroelectronics (Grenoble 2) SAS, Grenoble (FR); and STMicroelectronics (Alps) SAS, Grenoble (FR)
Filed on Mar. 29, 2022, as Appl. No. 17/707,321.
Claims priority of application No. 2103307 (FR), filed on Mar. 31, 2021.
Prior Publication US 2022/0317719 A1, Oct. 6, 2022
Int. Cl. G05F 3/30 (2006.01)
CPC G05F 3/30 (2013.01) 8 Claims
OG exemplary drawing
 
1. A circuit, comprising:
a band-gap circuit for generating a bandgap reference signal, comprising:
a first bipolar transistor;
a second bipolar transistor;
wherein the first and second bipolar transistors are of a same type;
wherein an emitter of the first bipolar transistor is coupled to a supply node;
a first resistor coupled between a base of the first bipolar transistor and the supply node;
a second resistor coupled between an emitter of the second bipolar transistor and the supply node;
where a base of the second bipolar transistor is coupled to a collector of the first bipolar transistor; and
a third resistor coupled between the base of the first bipolar transistor and the base of the second bipolar transistor;
wherein the first and second bipolar transistors are configured to generate a current varying proportionally with temperature; and
a first capacitor connected between the base and the emitter of one of the first and second bipolar transistors;
wherein:
the supply node receives a reference potential; and
further comprising:
a follower amplifier having an input coupled to the collector of the first bipolar transistor and an output coupled to the base of the second bipolar transistor; and
a current generating circuit configured to cause a collector current of the first bipolar transistor to be equal to a collector current of the second bipolar transistor, said current generating circuit coupled to receive a power supply potential that is positive relative to the reference potential.