US 12,468,328 B2
Low noise bandgap voltage reference circuits
Paul M. Werking, Rockford, MN (US)
Assigned to Honeywell International Inc., Charlotte, NC (US)
Filed by Honeywell International Inc., Charlotte, NC (US)
Filed on Apr. 11, 2023, as Appl. No. 18/298,875.
Prior Publication US 2024/0345613 A1, Oct. 17, 2024
Int. Cl. G05F 3/20 (2006.01); G05F 1/575 (2006.01); G05F 3/26 (2006.01); G05F 3/30 (2006.01)
CPC G05F 3/205 (2013.01) [G05F 1/575 (2013.01); G05F 3/267 (2013.01); G05F 3/30 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A circuit comprising:
an amplifier circuit comprising:
an output terminal configured to provide a voltage output; and
an input terminal;
a first shunt voltage reference circuit and a second shunt voltage reference circuit,
wherein the first shunt voltage reference circuit is a bandgap voltage reference circuit,
wherein the first shunt voltage reference circuit includes a first low terminal and a first high terminal,
wherein the second shunt voltage reference circuit includes a second low terminal and second high terminal,
wherein the first shunt voltage reference circuit connects in series with the second shunt voltage reference circuit such that the second high terminal provides a positive voltage and connects to the first low terminal,
wherein the first high terminal connects to the input terminal of the amplifier circuit to provide a positive summed voltage from the first shunt voltage reference circuit and the second shunt voltage reference circuit,
wherein the circuit further comprises a third shunt voltage reference circuit and a fourth shunt voltage reference circuit,
wherein the third shunt voltage reference circuit includes a third low terminal and a third high terminal,
wherein the fourth shunt voltage reference circuit includes a fourth low terminal and fourth high terminal,
wherein the first shunt voltage reference circuit and the second shunt voltage reference circuit comprise a first string of series connected voltage reference circuits,
wherein the third shunt voltage reference circuit connects in series with the fourth shunt voltage reference circuit such that the fourth high terminal connects to the third low terminal, to form a second string of series connected voltage reference circuits, and
wherein the third high terminal provides the positive summed voltage from the first shunt voltage reference circuit and the second shunt voltage reference circuit and connects to the input terminal of the amplifier circuit to form an array of parallel connected strings of voltage reference circuits.