Asymmetric band-gap reference circuit

A reference circuit, asymmetric technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as limiting chip yield, output voltage is not adjustable, low starting voltage, etc., to achieve good power characteristics, accurate and stable Effects of reference voltage and low power supply voltage operation

Inactive Publication Date: 2010-06-30
天津南大强芯半导体芯片设计有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(1) if Figure 1-a As shown, the common bandgap reference circuit has a high start-up voltage and an unadjustable output voltage; (2) such as Figure 1-b As shown, the ordinary low-voltage bandgap reference circuit ha

Method used

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Examples

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Embodiment

[0019] Embodiment: a kind of asymmetric bandgap reference circuit (see figure 2 ), including a power supply voltage terminal VDD, characterized in that it includes a positive temperature coefficient current generation unit, a negative temperature coefficient current generation unit, a zero temperature coefficient reference voltage VREF generation unit, a switching tube control unit and a start-up circuit Start up; wherein, said The input end of the positive temperature coefficient current generation unit is connected to the output end of the switch tube control unit, and its output end is grounded; the input end of the said negative temperature coefficient current generation unit is connected to the output end of the switch tube control unit, and its output end is grounded ; The input end connection end of said zero temperature coefficient reference voltage VREF generation unit is connected to the output end of the switch tube control unit, and its output terminal is grounded;...

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PUM

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Abstract

The invention relates to an asymmetric band-gap reference circuit which is characterized by comprising a positive temperature coefficient current generation unit, a negative temperature coefficient current generation unit, a zero temperature coefficient reference voltage VREF generation unit, a switch tube control unit and a start circuit Start-up; and the asymmetric band-gap reference circuit has the advantages that: (1) a unilateral resistor R2 serves as a low-voltage bandgap reference circuit for temperature compensation; (2) the obtained bandgap reference voltage VREF has low-power supply voltage action, extremely low temperature drift and better power supply features; (3) the circuit can still work normally when the op amp as quite high offset voltage; and (4) the structure is simple, the operation is convenient, and the circuit can provide precise and stable reference voltage for any system.

Description

(1) Technical field: [0001] The invention relates to a reference voltage compensation circuit, in particular to an asymmetrical bandgap reference circuit. (two) background technology: [0002] In general systems, there are generally two types of bandgap reference circuits. (1) if Figure 1-a As shown, the common bandgap reference circuit has high start-up voltage and non-adjustable output voltage; (2) such as Figure 1-b As shown, the ordinary low-voltage bandgap reference circuit has a low start-up voltage, and the output voltage can be any value, and the above circuit will fail to start when there is a large offset voltage in the op amp, such as Figure 4 As shown, this will limit the yield of the chip. (3) Contents of the invention: [0003] The purpose of the present invention is to design a kind of asymmetric bandgap reference circuit, it can overcome the deficiencies in the prior art, make the obtained bandgap reference voltage except low power supply voltage actio...

Claims

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Application Information

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IPC IPC(8): G05F3/30
Inventor 张小兴戴宇杰吕英杰林鹏程
Owner 天津南大强芯半导体芯片设计有限公司
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