Unlock instant, AI-driven research and patent intelligence for your innovation.

Circuits and methods to produce a bandgap voltage with low-drift

A kind of circuit, voltage technique, applied in the field of circuit and method for generating bandgap voltage with low drift

Active Publication Date: 2014-01-01
INTERSIL INC
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] In addition, bandgap voltage reference circuits generate noise, a strong component of which is 1 / F noise (sometimes called flicker noise), which is related to base current

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
  • Circuits and methods to produce a bandgap voltage with low-drift
  • Circuits and methods to produce a bandgap voltage with low-drift
  • Circuits and methods to produce a bandgap voltage with low-drift

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039] as above in Figure 1A and 2A As mentioned in the discussion of , the long-term drift of the current source of the bandgap voltage reference circuit causes the drift of the bandgap voltage output (VGO), which is not desirable. Embodiments of the invention described herein reduce this long-term drift, as will be referred to Figure 2A and 2B as described. Embodiments of the present invention can also reduce 1 / F noise.

[0040] According to an embodiment of the present invention, Figure 2A and 2B The three current sources in effectively switch places such that each current source spends 1 / 3 of the time in each position (ie, in each branch). In other words, the current generated by each current source is given by Figure 2A and 2B Each of the three circuit branches shown receives 1 / 3 of the time.

[0041] In this example, ΔI will create the sum of all these perturbation equations divided by 3 as ΔVGO. Adding them up gives the average output perturbation of ΔVGO ...

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

In accordance with an embodiment of the present invention, a bandgap voltage reference circuit includes a group of X current sources, a plurality of circuit branches, and a plurality of switches. Each of the X current sources (where X>=3) produces a corresponding current that is substantially equal to the currents produced by the other current sources within the group. The plurality of circuit branches of the bandgap voltage reference circuit are collectively used to produce a bandgap voltage output (VGO). Each of the plurality of circuit branches receives at least one of the currents not received by the other circuit branches. The plurality of switches (e.g., controlled by a controller) selectively change over time which of the currents produced by the current sources are received by which of the plurality of circuit branches of the bandgap voltage reference circuit.

Description

[0001] priority claim [0002] This application claims priority to the following U.S. patent applications: [0003] · Filed March 3, 2010 by Barry Harvey, entitled "CIRCUITS AND METHODS TO PRODUCE A BANDGAP VOLTAGE WITH LOW-DRIFT" (Attorney Docket No. ELAN -01249US1)", U.S. Patent Application No. 12 / 717,052, and [0004] "CIRCUITS AND METHODS TO PRODUCE A BANDGAP VOLTAGE WITH LOW-DRIFT," filed November 30, 2009, by Barry Harvey (Attorney Docket No. ELAN -01249US0)", each of which is incorporated herein by reference. field of invention [0005] Embodiments of the present invention generally relate to bandgap voltage reference circuits for generating a bandgap voltage output (VGO), methods for use with bandgap voltage reference circuits for generating a bandgap voltage output (VGO), and methods including generating a bandgap voltage output (VGO). Output (VGO) bandgap voltage reference circuit for larger circuits (such as voltage regulators). Background technique [0006] B...

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 Patents(China)
IPC IPC(8): G05F3/16
CPCG05F3/30
Inventor B·哈维
Owner INTERSIL INC