US 12,282,350 B2
Bandgap circuit with noise reduction and temperature stability
Moez Kanoun, Waterloo (CA)
Assigned to SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC, Scottsdale, AZ (US)
Filed by SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC, Phoenix, AZ (US)
Filed on Sep. 28, 2022, as Appl. No. 17/935,967.
Claims priority of provisional application 63/269,051, filed on Mar. 9, 2022.
Claims priority of provisional application 63/373,244, filed on Aug. 23, 2022.
Prior Publication US 2023/0288951 A1, Sep. 14, 2023
Int. Cl. G05F 3/26 (2006.01); G05F 3/30 (2006.01)
CPC G05F 3/26 (2013.01) [G05F 3/30 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A bandgap reference circuit, comprising:
a complimentary to absolute temperature (CTAT) current generator providing a CTAT current and including a source degeneration resistor;
a proportional to absolute temperature (PTAT) current generator providing a PTAT current and comprising:
a first branch comprising a source degeneration resistor, a first p-type metal-oxide semiconductor (PMOS) transistor, and a first n-type metal oxide semiconductor (NMOS) transistor, a resistor, and a diode-connected transistor;
a second branch comprising a source degeneration resistor, a second PMOS transistor, a second NMOS transistor, and a diode-connected transistor, the second branch coupled to the first branch in a current mirror configuration; and
a chopper circuit alternately coupling drain terminals of the first and second PMOS transistors to the remainder of their respective branches;
a first current mirror coupled to mirror the CTAT current and including a source degeneration resistor;
a second current mirror coupled to mirror the PTAT current and including a source degeneration resistor;
an output configured to combine the mirrored CTAT and PTAT currents to provide a reference current;
a first lowpass filter coupling gates of the first and second PMOS transistors of the PTAT current generator to a gate of a PMOS transistor in the second current mirror; and
a second lowpass filter coupling a gate of a PMOS transistor in the CTAT current generator to a gate of a PMOS transistor of the first current mirror.