Bandgap reference source circuit with starting circuit

Abstract

The invention discloses a band-gap reference source circuit with a starting circuit, and relates to the technical field of semiconductor integrated circuits. The circuit comprises a starting circuit and a band-gap reference source main body circuit, the starting circuit and the band-gap reference source main body circuit are respectively connected with a power supply voltage end; the starting circuit comprises an NMOS transistor. The band-gap reference source main body circuit at least comprises an operational amplifier, PMOS transistors and a triode. A source electrode of the NMOS transistoris connected with an inverting input end of the operational amplifier, a drain electrode of the first PMOS transistor, an emitting electrode of the first triode and the first resistor; an output end of the operational amplifier is respectively connected with the first PMOS transistor, the second PMOS transistor and the third PMOS transistor, a common end of the drain electrode of the third PMOS transistor and a second resistor is an output end of the circuit, and a grid electrode of the NMOS transistor is connected with the output end; the degenerate point problem of zero current of the wholecircuit is avoided, and an expected stable working point is achieved.

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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