Reference voltage source with high power supply rejection ratio (PSRR)

A high power supply rejection ratio, reference voltage source technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve the problem of insufficient stability of the output reference voltage, to improve PSRR, ensure accuracy, and enhance stability. Effect

Inactive Publication Date: 2016-08-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

The voltage reference source requires the output voltage to be very accurate and stable, but its power supply may be a wide input voltage source or there is a lot of noise, which makes the output reference voltage not stable enough, especially in high-frequency environments. In order to overcome these uncertain factors, it is necessary to The power supply rejection characteristics of the reference voltage source need to be improved as much as possible

Method used

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  • Reference voltage source with high power supply rejection ratio (PSRR)
  • Reference voltage source with high power supply rejection ratio (PSRR)
  • Reference voltage source with high power supply rejection ratio (PSRR)

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Embodiment Construction

[0011] Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail:

[0012] A common method to improve PSRR is to use a pre-calibration circuit to generate a stable internal voltage, and then place the core circuit of the bandgap reference source at the internal calibration voltage to obtain a higher power supply rejection ratio, but introducing a pre-calibration circuit increases the Power consumption and complexity of the circuit. The present invention proposes a new idea to improve the PSRR of different frequency bands. At medium and low frequencies, PSRR is improved by introducing a self-biased cascode structure as a load to shield the influence of power supply changes; at high frequencies, the purpose of improving PSRR is achieved by introducing capacitor filtering effects.

[0013] Such as figure 1 As shown, a high power supply rejection ratio reference voltage source of the present invention includes a first PMOS trans...

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Abstract

The invention belongs to the technical field of integrated circuit and relates to a reference voltage source with high power supply rejection ratio (PSRR). The reference voltage source is characterized in that a new train of thought is put forward to improve the PSRR of different frequencies, the PSRR is improved by introducing a self-biased cascade structure as the load to shield power supply change effect when in the medium and low frequency, and the purpose of improving the PSRR is achieved by introducing capacitance filtering effect in the high frequency. The reference voltage source has the advantages that the full-band PSRR is improved, reference voltage output through the voltage reference circuit is ensured to be precise, and stability of the output reference voltage of the voltage reference circuit is improved.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits and relates to a high power supply rejection ratio reference voltage source. Background technique [0002] The voltage reference circuit is widely used in high-precision analog and digital-analog hybrid circuits due to the accuracy and stability of its output reference voltage, and in most cases, the reference voltage source is used in a wide voltage source or high-frequency environment. Therefore, the suppression characteristic of the voltage reference circuit to the power supply is an important factor that circuit designers are extremely concerned about. Usually, the power supply rejection ratio (PSRR) is used to measure this characteristic of the reference. The voltage reference source requires the output voltage to be very accurate and stable. However, its power supply may be a wide input voltage source or there is a lot of noise, which makes the output reference voltage not stable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 周泽坤何烨李要石跃王卓张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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