Bandgap reference circuit and electronic device

By using PMOS devices and a feedback loop in the bandgap reference circuit, the problem of the inability to establish a reference voltage under low voltage conditions is solved, and a stable reference voltage output under low voltage conditions is achieved, which is suitable for low-voltage chip applications.

CN117666690BActive Publication Date: 2026-07-24SG MICRO CORP
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Patent Information

Application Number
CN202311439832.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-11-01
Publication Date
2026-07-24
Estimated Expiration
2043-11-01

AI Technical Summary

Technical Problem

Traditional bandgap reference circuits cannot establish a reference voltage properly in low-voltage applications, which limits their application in low-voltage chips.

Method used

Using a PMOS device as the main conductor, a bias current is provided during the startup phase through a startup module to build a feedback loop, and grounding is performed when the reference voltage meets the preset value. Combined with a high and low temperature compensation module and a chopper unit, the impact of temperature and process mismatch is reduced.

Benefits of technology

It achieves stable output of target reference voltage under low voltage conditions, meeting the needs of most low voltage applications and improving the stability and applicability of the circuit.

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Abstract

The embodiment of the present disclosure provides a band gap reference circuit and an electronic device, comprising: a starting module, a reference voltage module and a bias voltage module; wherein the starting module is configured to provide a bias current to the reference voltage module in a starting phase, and ground the bias current when a reference voltage of a reference voltage node meets a preset reference voltage; the bias module is configured to output a bias voltage to the reference voltage module when the reference voltage of the reference voltage node meets the preset reference voltage; and the reference voltage module is configured to charge the reference voltage node based on the bias current and construct a feedback loop in the starting phase, and make the reference voltage node output a stable target reference voltage based on the bias voltage and the feedback loop after the reference voltage meets the preset reference voltage; since the reference voltage module takes a PMOS device as a main pipe, the power supply rail of the circuit can be as low as VGS_MP12+VDS_MN5+VCE_Q3, that is, less than 2V, which can meet the needs of most low-voltage applications.
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Citation Information

Patent Citations

  • Starting circuit applied to bandgap reference circuit

    CN109491447A