A High Power Supply Rejection Ratio Bandgap Reference Circuit with Pre-stabilized Voltage Structure

Abstract

A high power supply rejection ratio bandgap reference circuit with a pre-stabilized voltage structure, including a first start-up circuit, a second start-up circuit, a third start-up circuit, a pre-stabilized voltage circuit, a reference current source circuit and a bandgap reference core circuit, the first A start-up circuit, a second start-up circuit, and a third start-up circuit are respectively used to start a pre-regulator circuit, a reference current source circuit, and a bandgap reference core circuit; The starting circuit, the reference current source circuit and the bandgap reference core circuit supply power to achieve the effect of suppressing the power supply ripple; the reference current source circuit is used to generate a reference current, and the bandgap reference core circuit generates a reference voltage. The invention effectively improves the technology by setting the cascode current mirror of the bandgap reference core circuit, the feedforward path of the output terminal of the operational amplifier, adding a third branch circuit to the reference current source circuit, and connecting the RC low-pass filter circuit in series with the output terminal of the reference source. The power supply rejection ratio of the bandgap reference circuit is shown.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits and relates to a bandgap reference circuit with a high power supply rejection ratio and a pre-stabilized voltage structure. Background technique [0002] As the core module of the analog circuit, the bandgap reference circuit provides a reference voltage for the analog circuit that does not change with changes in power supply voltage, process and temperature. Its performance determines the performance and function realization of the entire analog circuit and even the entire chip. In a mixed-signal system, because the high-frequency coupling noise of the digital circuit module can be fed through to the analog circuit module through the power supply, ground and analog-digital interface, it will have a fatal impact on the sensitive analog circuit, so the power supply ripple of the bandgap reference Wave noise suppression ability has attracted more and more attention. [0003] Existing tr...

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Problems solved by technology

[0003] Existing traditional reference sources usually use the addition of the negative temperature coefficient of the base-emitter voltage Vbe of the bipolar transistor and the voltage of the positive temperature coefficient to eliminate the first-order temperature in the bandgap reference source. Although the bandgap reference source It can generate a first-order temperature-independent reference voltage, but its power supply rejection (PSR) is generally poor, which seriously affects the performance of the chip

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