Single-bipolar transistor floating band-gap reference circuit

• Main Authors: ZHANG ZHENGFAN, HU HUAN
• Format: Patent
• Language: Chinese; English
• Published: 05.09.2023
• Subjects: CONTROLLING; PHYSICS; REGULATING; SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES

The single-bipolar transistor floating band-gap reference circuit comprises a first power supply I1, a second power supply I2, a third power supply I3, a voltage-controlled current source I, a bipolar transistor, a fully differential operational amplifier, a common-mode feedback operational amplifier, a switch and a capacitor, a band-gap reference is generated based on a voltage difference between a forward voltage VAB1 generated by cooperation of a first power supply I1, a second power supply I2, a bipolar transistor and a switch and a forward voltage VAB2 generated by cooperation of the first power supply I1, the bipolar transistor and the switch, and a stably output common-mode voltage is obtained through a common-mode feedback control loop; the single bipolar transistor is adopted, the chip area is saved, the mismatch problem between the bipolar transistors is avoided, meanwhile, the switched capacitor circuit is adopted to adjust the superposition proportion between the positive temperature coefficient v