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Low noise bandgap reference circuit and reference source generation system

A reference circuit, low-noise technology, used in control/regulating systems, regulating electrical variables, instruments, etc., can solve problems such as the inability to suppress the noise of the reference source circuit and the large noise of the bandgap reference source, so as to avoid adverse effects. , suppress noise, and achieve the effect of clamping

Active Publication Date: 2014-04-23
BRIGATES MICROELECTRONICS KUNSHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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Experimental program
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Embodiment Construction

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

[0070] After research, the inventor found that the chip area and chip pins are limited and other reasons. figure 1 The band gap reference source shown has a lot of noise. In addition, figure 1 The error amplifier EA in the band gap reference source shown will also generate a lot of noise, which makes the noise in the entire band gap reference source too large.

[0071] In the prior art, although it can be reduced by adding an external capacitor figure 1 The noise of the circuit shown, but increasing the off-chip capacitance 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 capacitance will also lead t...

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PUM

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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 present invention relates to the technical field of integrated circuits, in particular to a low-noise band gap reference circuit and a reference source generation system. Background technique [0002] As the integration of CMOS integrated circuits further improves, more and more chips use on-chip voltage and current references. The on-chip voltage reference and power supply have the advantages of immunity to process deviations, reduced circuit system complexity and cost, and reduced 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 source circuit is generally composed of a bandgap reference (bandgap), a reference voltage and current generating circuit. First, the band gap reference generates a temperature-independent reference voltage, and then through the reference voltage and current generating circuit to generate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
Inventor 张琦
Owner BRIGATES MICROELECTRONICS KUNSHAN