Band-gap reference voltage source with high power supply rejection ratio

Abstract

The invention discloses a band-gap reference voltage source with a high power supply rejection ratio. The band-gap reference voltage source comprises a band-gap reference core circuit, a power ripple feed forward circuit, a folded cascode operation amplifier circuit, a biasing circuit and a starting circuit, wherein reference voltage is detected and output by the starting circuit so as to provide a starting signal for the biasing circuit and the band-gap reference core circuit, bias voltage is output to the folded cascode operation amplifier circuit and the power ripple feed forward circuit by the biasing circuit, a power ripple signal provided by the band-gap reference core circuit is forwarded to the folded cascade operation amplifier circuit by the power ripple feed forward circuit, difference-mode voltage of the band-gap reference core circuit and the folded cascode operation amplifier circuit is amplified and output to the band-gap reference core circuit by the folded cascode operation amplifier circuit, and at last, band-gap reference voltage Vref is output by the band-gap reference core circuit.

Description

technical field [0001] The invention relates to a bandgap reference voltage source, in particular to a bandgap reference voltage source with high power supply rejection ratio, belonging to the technical field of microelectronics. Background technique [0002] With the continuous development of integrated circuit technology, the structure of the circuit system has become more and more complex, and higher requirements have been put forward for analog circuits such as A / D, D / A, filters, and phase-locked loops, and the accuracy and stability have also increased. Become more important, the reference voltage source is the basic module of the analog circuit, its accuracy and stability are directly related to the working state and performance of the system, so it is very important to design a reference voltage source with good performance. [0003] Bandgap voltage references are widely used due to their advantages such as good temperature performance, stable output voltage and low p...

AI Technical Summary

Problems solved by technology

However, it is difficult to obtain a high power supply rejection ratio for the above-mentioned bandgap reference voltage source, because the isolation of the power supply ripple is not enough, so it is difficult to meet the high power supply rejection ratio required by high-precision analog circuits

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