A bandgap reference with fast start-up and high psrr

Abstract

The invention discloses a bandgap reference source with quick start and high PSRR, belonging to the technical field of integrated circuits. The bandgap reference with fast start-up and high PSRR includes a bandgap reference main loop for generating the reference voltage V REF ; Feedforward noise elimination module, used to reduce power supply noise in the middle frequency band to the reference voltage V REF The impact; the output impedance enhancement module is used to increase the reference voltage V REF PSRR characteristics in the low frequency band; high frequency filter module, used to improve the reference voltage V REF PSRR characteristics at high frequency. Without increasing the start-up time of the bandgap reference source or reducing the accuracy of the output reference voltage, the noise and PSRR characteristics of the bandgap reference source in the entire frequency band are greatly improved. The output impedance enhancement module can improve the PSRR characteristics in the low frequency band, and the feedforward noise elimination module can reduce the power supply noise in the mid-frequency band to the reference voltage V REF The high-frequency filter module can improve the high-band PSRR characteristics without increasing the start-up time.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a bandgap reference source with fast startup and high PSRR. Background technique [0002] As a basic module in circuit design, bandgap reference voltage source is widely used in analog, mixed-signal and RF system-on-chip. For bandgap references used in mixed-signal chips, they must have high PSRR over a wide frequency range to suppress noise coupled from high-speed digital modules. The accuracy of the bandgap reference has a great influence on the performance of the overall chip, so it must have high PSRR and low temperature coefficient. In addition to high PSRR and high output voltage accuracy, the bandgap reference source must also have fast start-up characteristics to meet the needs of on-chip communication systems, LDO (low dropout regulator, low dropout linear regulator) and PLL (Phase Locked Loop, phase-locked Ring) and other applications that have special req...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a bandgap reference source with fast start-up and high PSRR, to solve the problem that the bandgap reference source cannot be improved in the whole world without increasing the start-up time of the bandgap reference source or reducing the accuracy of the output reference voltage. Problems with noise and PSRR characteristics in the frequency band

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