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Low noise bandgap reference circuit and reference source generation system

A reference circuit, low-noise technology, applied in control/regulating systems, adjusting electrical variables, instruments, etc., can solve the problems of large noise of the bandgap reference source and the inability to suppress the noise of the reference source circuit well, to achieve noise suppression, Avoid adverse effects and achieve clamping effect

Active Publication Date: 2012-09-19
BRIGATES MICROELECTRONICS KUNSHAN
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0010] but figure 1 The shown bandgap reference source has a lot of noise, which cannot well suppress the noise of the reference source circuit itself, especially the flicker noise (or 1 / f noise) of the device

Method used

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  • Low noise bandgap reference circuit and reference source generation system
  • Low noise bandgap reference circuit and reference source generation system
  • Low noise bandgap reference circuit and reference source generation system

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Embodiment Construction

[0069] As mentioned in the background art, the bandgap reference source in the prior art cannot suppress noise very well, especially the flicker noise of the device itself, thus causing adverse effects on subsequent circuits.

[0070] After research, the inventor found that due to the limited area of ​​the chip and the limited pins of the chip, etc. figure 1 The shown bandgap reference is noisy. in addition, figure 1 The error amplifier EA in the bandgap reference shown can also be quite noisy by itself, making the overall bandgap reference excessively noisy.

[0071] In the prior art, although it can be reduced by increasing the external capacitance figure 1 The noise of the circuit shown, but increasing the off-chip capacitor will increase the pins of the chip, thereby increasing the difficulty of chip packaging and increasing the area of ​​the chip, which is not conducive to chip integration; in addition, increasing the off-chip capacitor will also lead to Rising costs a...

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Abstract

The invention discloses a low noise bandgap reference circuit and a reference source generation system. The reference source generation system comprises a bandgap reference generation circuit, a low dropout linear voltage stabilizing circuit and the low noise bandgap reference circuit. The low noise bandgap reference circuit comprises a starting circuit, a clamping circuit, a temperature coefficient compensation circuit and an output circuit, wherein the starting circuit is used for supplying starting voltage to other circuits and is turned off after other circuits are started; the clamping circuit comprises four metal oxide semiconductor (MOS) tubes which are connected by a current mirror structure to realize a clamping function; the temperature coefficient compensation circuit is used for performing temperature coefficient compensation on voltage which is output by the clamping circuit and generating reference voltage which is irrelevant to temperature; and the output circuit is used for outputting second reference voltage. The reference source generation system generates extremely low noise and has high power rejection ratios.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a low-noise bandgap reference circuit and a reference source generation system. Background technique [0002] With the further improvement of the integration level of CMOS integrated circuits, more and more chips use on-chip voltage and current references. The on-chip voltage reference and power supply have the advantages of being immune to process deviation, reducing the complexity and cost of the circuit system, and reducing the system area, so they are widely used in digital / analog converters, communication circuits, data acquisition systems, and precision sensing. [0003] The on-chip voltage and current reference circuit generally consists of a bandgap reference (bandgap), a reference voltage and current generation circuit. First, the temperature-independent reference voltage is generated by the bandgap reference, and then various voltage and current references ...

Claims

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Application Information

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IPC IPC(8): G05F1/56
Inventor 张琦
Owner BRIGATES MICROELECTRONICS KUNSHAN
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