Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

High-precision correcting circuit for band-gap reference voltage source

A reference voltage source, reference source technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of unchangeable output reference, high cost, affecting the accuracy of the reference source, etc., to achieve flexible calibration, high precision, small area effect

Active Publication Date: 2017-12-15
GUANGXI NORMAL UNIV
View PDF8 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional correction technology generally trims the components in the core circuit of the bandgap reference source. The introduction of this trimming technology will make the temperature characteristics of the output reference voltage or reference current worse and affect the accuracy of the reference source.
The traditional trimming technology generally adopts laser trimming and fuse trimming technology, the cost is high and the output reference cannot be changed after trimming, which cannot cope with the impact of packaging pressure and environmental temperature changes

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
  • High-precision correcting circuit for band-gap reference voltage source
  • High-precision correcting circuit for band-gap reference voltage source
  • High-precision correcting circuit for band-gap reference voltage source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments, so as to obtain a better understanding.

[0014] figure 1 As shown, it is a commonly used bandgap reference voltage source core circuit, which is used to generate a reference voltage V BG , theoretical analysis can draw the reference voltage V when the temperature coefficient is zero BG ≈1.25V, but due to the influence of process angle, offset, temperature and other factors, the reference voltage value will produce errors. In order to eliminate the errors generated by the reference voltage, it is necessary to design a correction circuit to correct the reference voltage to near the ideal value. Through reasonable design and monte carlo simulation of this circuit, the simulation can show that the output reference voltage is between 1.1V-1.3V. The present invention needs to generate a reference voltage of 1.2V, so it is necessary...

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 discloses a high-precision correcting circuit for a band-gap reference voltage source. The circuit includes an operational amplifier, a capacitor, a PMOS tube and a trimming circuit. The opposite phase end of the operational amplifier is connected with reference voltage VBG generated by the band-gap reference voltage source, the in-phase end of the operational amplifier is connected with a first terminal Vf of the trimming circuit, and the output end of the operational amplifier is connected with a first terminal of the capacitor and a grid electrode of the PMOS tube; a source electrode of the PMOS tube is connected with an electric source VDD, a drain electrode of the PMOS tube is connected with a second terminal of the capacitor and a second terminal Vtop of the trimming circuit, a third terminal V1.2 of the trimming circuit is output voltage after correcting, and a fourth terminal Vbottom of the trimming circuit is connected with the ground. According to the high-precision correcting circuit for the band-gap reference voltage source, a snubber circuit in the band-gap reference voltage source is integrated with the correcting circuit, errors caused by influences of process corners, imbalance, temperature and other factors in the reference voltage can be corrected, the influences caused by fine adjustment on the temperature features of the reference voltage can be eliminated and the load carrying capacity of the output voltage is improved. By adopting a digital trimming mode, the high-precision correcting circuit has the advantages of being flexible in correcting, high in precision, low in power consumption and small in area.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a high-precision correction circuit for a bandgap reference voltage source. Background technique [0002] With the continuous improvement of system integration, almost all integrated circuits need a high-precision reference source to achieve the best performance of the system, and the bandgap reference source has the best performance and is widely used in integrated circuits. In the integrated circuit manufacturing process, the accuracy of the bandgap reference source is affected by process deviation, mismatch, external load changes, and temperature changes. In order to obtain a high-precision bandgap reference source, some correction techniques are usually required. The traditional correction technology generally trims the components in the core circuit of the bandgap reference source. The introduction of this trimming technology will make the temperature characteristic...

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
Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/625
CPCG05F1/625Y02B70/10
Inventor 蔡超波宋树祥岑明灿李桂琴王斌王宜瑜胡文灿
Owner GUANGXI NORMAL UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products