Bandgap reference circuit with start-up circuit

Abstract

The application discloses a bandgap reference source circuit with a start-up circuit, which relates to the technical field of semiconductor integrated circuits. The circuit includes a starting circuit and a main circuit of a bandgap reference source; the starting circuit and the main circuit of the bandgap reference source are respectively connected to a power supply voltage terminal; the starting circuit includes an NMOS transistor, and the main circuit of the bandgap reference source includes at least an operational amplifier, a PMOS transistor, and a triode; The source of the NMOS transistor is connected to the inverting input terminal of the operational amplifier, the drain of the first PMOS transistor, the emitter of the first triode, and the first resistor; the output terminal of the operational amplifier is connected to the first PMOS transistor and the second PMOS transistor. tube and the third PMOS tube are connected respectively, the drain of the third PMOS tube and the common terminal of the second resistor are the output terminals of the circuit, and the gate of the NMOS tube is connected to the output terminal; the problem of degeneracy point of zero current in the whole circuit is avoided , to reach the desired stable operating point.

Description

technical field [0001] The present application relates to the technical field of semiconductor integrated circuits, in particular to a bandgap reference source circuit with a start-up circuit. Background technique [0002] The bandgap reference source circuit is widely used in integrated circuits, and the bandgap reference source circuit is used to provide a reference voltage that does not vary with temperature and voltage power supply, or a reference current obtained by converting the reference voltage. A general low-voltage bandgap reference source circuit has a start-up problem, that is, there are multiple degeneracy points, among which zero current in the overall circuit is undesirable, and a desired stable operating point is required. Contents of the invention [0003] The present application provides a bandgap reference source circuit with a start-up circuit, which can solve the problem of the degeneracy point of zero current in the overall circuit in the related art...

AI Technical Summary

Problems solved by technology

The general low-voltage bandgap reference source circuit has a start-up problem, that is, there are multiple degeneracy points. Among them, the zero current of the overall circuit is not expected to appear, and the expected stable operating point is required.

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