US 12,259,743 B2
Bandgap reference circuit with trimming circuit
Guillaume Mouret, Portet-sur-Garonne (FR); Yann Cargouet, Portet-sur-Garonne (FR); and Thierry Michel Alain Sicard, Haute Garonne (FR)
Assigned to NXP USA, Inc., Austin, TX (US)
Filed by NXP USA, Inc., Austin, TX (US)
Filed on Feb. 14, 2023, as Appl. No. 18/168,767.
Claims priority of application No. 22305207 (EP), filed on Feb. 24, 2022.
Prior Publication US 2023/0266786 A1, Aug. 24, 2023
Int. Cl. G05F 3/26 (2006.01)
CPC G05F 3/267 (2013.01) 20 Claims
OG exemplary drawing
 
1. A bandgap reference circuit comprising:
a first current generator comprising first and second circuit branches respectively comprising first and second bipolar transistors having different sizing reference values for generating a first current at a first resistor, wherein the first current varies proportionally as a function of temperature,
a second current generator comprising a third circuit branch comprising a first field effect transistor for generating a second current at a second resistor, wherein the second current varies inversely as a function of temperature;
a trimming circuit comprising:
a fourth circuit branch comprising a third bipolar transistor which is sized to match the first bipolar transistor;
a third current generator comprising a second field effect transistor coupled to a collector and a base of the third bipolar transistor and configured to generate a third current based on a base current of the third bipolar transistor, and
a trim control circuit configured to modify the second current by adding the third current to the second current or subtracting the third current from the second current based on a first trim control signal; and
a third circuit configured to generate a bandgap reference current based on a summation of the first current and the modified second current.