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High power supply ripple rejection ratio ultralow temperature dependent band-gap reference circuit

A reference circuit, negative temperature technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of raising the minimum power supply voltage, high power consumption, high power, etc., to improve the gain, low power consumption, The effect of reducing the temperature coefficient

Pending Publication Date: 2022-05-10
苏州斯美芯微电子有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the range of -40°C to 125°C, a temperature drift coefficient of 11.68ppm / °C is obtained. The current consumption of the proposed voltage self-regulating circuit is 42μB. This power consumption is relatively large, which is a shortcoming of this design.
It can be seen that the introduction of this self-regulating circuit greatly improves PSRR, but it consumes more power alone, and according to theoretical analysis, its minimum supply voltage is also raised

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  • High power supply ripple rejection ratio ultralow temperature dependent band-gap reference circuit
  • High power supply ripple rejection ratio ultralow temperature dependent band-gap reference circuit
  • High power supply ripple rejection ratio ultralow temperature dependent band-gap reference circuit

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Embodiment Construction

[0018] The following examples are further explanations and supplements to the present invention, and do not constitute any limitation to the present invention. as attached figure 2 As shown, the high-precision bandgap reference circuit includes a first core reference voltage generation module, a second start-up circuit module and a third MOS low-pass filter module.

[0019] The first core reference generation circuit module realizes the bandgap reference structure by generating PTAT current. It includes a first BJT (Q 1 ) and the first resistance of the first current (R 1 ), a second BJT that produces a second current that is inversely proportional to absolute temperature (Q 2 ), and a third BJT for absolute temperature independence (Q 3 ) and the second resistance of the third current (R 2 ). Wherein the emitter junction area of ​​the first BJT is 7 (M=7) times of the emitter junction area of ​​the second BJT, and the emitter junction area of ​​the first BJT is 7 (M=7)...

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Abstract

The invention provides a band-gap reference circuit with high power supply ripple rejection ratio (PSRR) and ultralow temperature dependence, which utilizes the negative temperature dependent base-emitter voltage VBE of bipolar transistors and the positive temperature dependent base-emitter voltage difference value delta VBE formed by two bipolar transistors with different areas, so that the band-gap reference circuit with high power supply ripple rejection ratio (PSRR) and ultralow temperature dependence is obtained. The positive and negative temperature dependent voltages are added by adjusting a certain proportion through the resistor, so that the zero-temperature dependent reference voltage is formed. The size selection of the operational amplifier and the current mirror is related to the PSRR, so that the characteristic of high PSRR is realized by improving the gain of the operational amplifier, increasing the length of a PMOS (P-channel Metal Oxide Semiconductor) tube of the current mirror and adding an MOS (Metal Oxide Semiconductor) low-pass filter.

Description

technical field [0001] The invention relates to a bandgap reference circuit in the field of integrated electronic circuits, in particular to a high-precision bandgap reference circuit. Background technique [0002] The Bandgap Reference circuit (BGR) provides a stable reference voltage for the SoC (System on a Chip) that does not fluctuate with temperature, supply voltage and process. In order to ensure the accurate operation of the subsequent on-chip circuit, it needs to meet a certain precision design: Yes Insensitive to temperature fluctuations and low sensitivity to fluctuations in supply voltage. [0003] For integrated circuits, the power supply itself is not an ideal DC voltage, and will contain a certain amount of AC noise components, and other circuits in the entire system on chip, such as digital circuits, digital-analog hybrid circuits, etc., will also generate large noise during operation. noise. These noises together constitute power supply noise, and for anal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/565
CPCG05F1/565
Inventor 刘冉光
Owner 苏州斯美芯微电子有限公司
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