Band-gap reference circuit

A technology of reference circuit and reference voltage source, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve problems such as low power consumption, achieve the effects of improving performance, saving area and power consumption, and improving power supply rejection ratio

Active Publication Date: 2014-10-29
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
View PDF5 Cites 34 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bandgap reference proposed by some circuits in the prior art is a circuit that does not use an operational amplifier. Althoug

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Band-gap reference circuit
  • Band-gap reference circuit
  • Band-gap reference circuit

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Such as figure 1 Shown is a schematic diagram of a bandgap reference circuit according to an embodiment of the present invention. The present invention provides a bandgap reference circuit that includes a reference voltage source VREF. The reference voltage source VREF stretches the gate voltage V_REG to achieve internal pre-regulation, And form an internal pre-regulator circuit; a band gap core circuit with a self-biased cascode amplifier circuit to improve the power supply rejection ratio; a negative feedback circuit, the negative feedback circuit is the band The gap core circuit provides a regulated power supply voltage VDD; a startup circuit, which stretches the reference voltage source VREF at the beginning of work to make the self-biased cascode amplifier circuit work normally.

[0021] The bandgap core circuit of the present invention is also provided with a first resistor R1, a second resistor R2, a first bipolar transistor Q1, a second bipolar transistor Q2 that i...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a band-gap reference circuit. The band-gap reference circuit comprises a reference voltage source VREF, a band-gap core circuit, a negative feedback circuit and a starting circuit, wherein gate voltage V_REG is stretched by the reference voltage source VREF so that internal voltage pre-stabilization can be achieved, an internal voltage pre-stabilizing circuit is formed, the band-gap core circuit is provided with an automatic biasing cascode amplifying circuit used for increasing a power supply rejection ratio, the negative feedback circuit provides the supply voltage VDD, processed through voltage stabilization, for the band-gap core circuit, and the starting circuit stretches the reference voltage source VREF when work begins so that the automatic biasing cascode amplifying circuit can work normally. According to the band-gap reference circuit, due to the facts that the supply voltage VDD processed through voltage stabilization is provided for the band-gap core circuit through the negative feedback circuit, and the automatic biasing cascode amplifying circuit is adopted inside for increasing the power supply rejection ratio, area and power consumption are saved.

Description

【Technical field】 [0001] The invention relates to a bandgap reference circuit, in particular to a bandgap reference circuit in a power management chip DC-DC converter. 【Background technique】 [0002] The bandgap reference circuit is an integral part of the DC-DC converter, due to the feedback voltage V of the PWM and PFM operating modes fb must be compared with a reference voltage generated by the bandgap reference circuit. Therefore, an accurate reference voltage can regulate the voltage accurately. [0003] The basic principle of a bandgap voltage reference is to use two voltages with opposite temperature coefficients to add with appropriate weights to produce a voltage with zero temperature coefficient. A bipolar transistor (BJT) has the following two characteristics: the base-emitter voltage Vbe of a bipolar transistor is inversely proportional to the absolute temperature; at different collector currents, the base-emitter voltage of two bipolar transistors The differe...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G05F1/56
Inventor 姚爱萍张金勇王磊
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap