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US 7,023,194 B1Granted
Low power and high accuracy band gap voltage reference circuit
AssigneeMarvell International Ltd.
InventorsSehat Sutardja, Jiancheng Zhang
Life of this patent
Estimating the term…
Abstract
A band gap voltage reference circuit includes a high accuracy band gap (BG) circuit that generates a BG voltage potential VbgH. A low accuracy BG circuit includes a variable resistance and outputs a BG voltage potential VbgL that is related to a value of the variable resistance. A calibration circuit communicates with the high and low accuracy BG circuits, adjusts the variable resistance based on a difference between the BG voltage potential VbgH and the BG voltage potential VbgL, and shuts down the high accuracy BG circuit when the BG voltage potential VbgL is approximately equal to the BG voltage potential VbgH.
Claims96
A band gap voltage reference circuit comprising:
- a high accuracy band gap (BG) circuit that generates a BG voltage potential VbgH;
- a low accuracy BG circuit that includes a variable resistance and that outputs a BG voltage potential VbgL that is related to a value of said variable resistance, and that has a lower accuracy than said high accuracy BG circuit;
- and
- a calibration circuit that communicates with said high accuracy and low accuracy BG circuits, that adjusts said variable resistance based on a difference between said BG voltage potential VbgH and said BG voltage potential VbgL, and that shuts down said high accuracy BG circuit when said BG voltage potential VbgL is approximately equal to said BG voltage potential VbgH.
1 more element
A band gap voltage reference circuit comprising:
- a high accuracy band gap (BG) circuit that generates a BG voltage potential VbgH;
- a low accuracy BG circuit that generates a BG voltage potential VbgL;
- and
- a calibration circuit that communicates with said high accuracy and low accuracy BG circuits and that adjusts said BG voltage potential VbgL based on said BG voltage potential VbgH.
1 more element
A band gap voltage reference circuit comprising:
- a high accuracy band gap (BG) circuit that generates a BG voltage potential VbgH;
- a low accuracy BG circuit that generates a BG voltage potential VbgL;
- and
- a device that communicates with said high and low accuracy BG circuits, that includes a high accuracy circuit and a low accuracy circuit, that operates at least one of said high accuracy circuit and said low accuracy circuit in a high accuracy mode, that operates said low accuracy circuit in a low accuracy mode, and that generates a mode signal based on said high accuracy mode and said low accuracy mode,
- wherein said high accuracy BG circuit turns off when said mode signal corresponds to said low accuracy mode.
2 more elements
A band gap voltage reference circuit comprising:
- high accuracy band gap (BG) means for generating a BG voltage potential VbgH;
- low accuracy BG means, that includes a variable resistance means for providing a variable resistance and for generating a BG voltage potential VbgL based on said variable resistance means;
- and
- calibration means, that communicates with said high accuracy and low accuracy BG means, for adjusting said variable resistance based on a difference between said BG voltage potential VbgH and said BG voltage potential VbgL and for shutting down said high accuracy BG means when said BG voltage potential VbgL is approximately equal to said BG voltage potential VbgH.
1 more element
A band gap voltage reference circuit, comprising:
- high accuracy band gap (BG) means for generating a BG voltage potential VbgH;
- low accuracy BG means for generating a BG voltage potential VbgL;
- and
- calibration means, that communicates with said high accuracy and low accuracy BG means, for adjusting said BG voltage potential VbgL based on said BG voltage potential VbgH.
1 more element
A band gap voltage reference circuit, comprising:
- high accuracy band gap (BG) means for generating a BG voltage potential VbgH;
- low accuracy BG means for generating a BG voltage potential VbgL;
- and
- circuit means, that communicates with said high and low accuracy BG means and that includes a high accuracy mode and a low accuracy mode, for generating a mode signal based on said high accuracy mode and said low accuracy mode,
- wherein said high accuracy BG means turns off when said mode signal corresponds to said low accuracy mode.
2 more elements
A method for generating a band gap voltage reference, comprising:
- generating a BG voltage potential VbgH using a high accuracy BG circuit;
- generating a BG voltage potential VbgL using a low accuracy BG circuit that includes a variable resistance, wherein said BG voltage potential VbgL is related to said variable resistance;
- adjusting said variable resistance based on a difference between said BG voltage potential VbgH and said BG voltage potential VbgL;
- and
- shutting down said high accuracy BG circuit when said BG voltage potential VbgL is approximately equal to said BG voltage potential VbgH.
2 more elements
A method for providing a band gap voltage reference, comprising:
- generating a BG voltage potential VbgH using a high accuracy band gap (BG) circuit;
- generating a BG voltage potential VbgL using a low accuracy BG circuit;
- and
- adjusting said BG voltage potential VbgL based on said BG voltage potential VbgH.
1 more element
A method for generating a band gap voltage reference, comprising:
- generating a BG voltage potential VbgH using a high accuracy band gap (BG) circuit;
- generating a BG voltage potential VbgL using a low accuracy BG circuit;
- providing a device having a high accuracy mode and a low accuracy mode;
- generating a mode signal using said device based on said high accuracy mode and said low accuracy mode;
- and
- turning off said high accuracy BG circuit when said mode signal corresponds to said low accuracy mode.
3 more elements
A band gap voltage reference circuit comprising:
- a first band gap (BG) circuit that generates a first BG voltage potential;
- a second BG circuit that includes a variable resistance, that outputs a second BG voltage potential that is related to a value of said variable resistance;
- and
- a calibration circuit that communicates with said first and second BG circuits, that adjusts said variable resistance based on a difference between said first BG voltage potential and said second BG voltage potential, and that shuts down said first BG circuit when said second BG voltage potential is approximately equal to said first BG voltage potential.
1 more element
A band gap voltage reference circuit comprising:
- a first band gap (BG) circuit that generates a first BG voltage potential;
- a second BG circuit that generates a second BG voltage potential;
- and
- a calibration circuit that communicates with said first and second BG circuits and that adjusts said second BG voltage potential based on said first BG voltage potential.
1 more element
A band gap voltage reference circuit comprising:
- a first band gap (BG) circuit that generates a first BG voltage potential;
- a second BG circuit that generates a second BG voltage potential;
- and
- a device that communicates with said first and second BG circuits, that includes a first circuit and a second circuit, that operates at least one of said first circuit and said second circuit in a first mode, that operates said second circuit in a second mode, and that generates a mode signal based on said first mode and said second mode,
- wherein said first BG circuit turns off when said mode signal corresponds to said second mode.
2 more elements
A band gap voltage reference circuit comprising:
- first band gap (BG) means for generating a first BG voltage potential;
- second BG means, that includes a variable resistance means for providing a variable resistance, for generating a second BG voltage potential based on said variable resistance means;
- and
- calibration means, that communicates with said first and second BG means, for adjusting said variable resistance based on a difference between said first BG voltage potential and said second BG voltage potential and for shutting down said first BG means when said second BG voltage potential is approximately equal to said first BG voltage potential.
1 more element
A band gap voltage reference circuit, comprising:
- first band gap (BG) means for generating a first BG voltage potential;
- second BG means for generating a second BG voltage potential;
- and
- calibration means, that communicates with said first and second BG means, for adjusting said second BG voltage potential based on said first BG voltage potential.
1 more element
A band gap voltage reference circuit, comprising:
- first band gap (BG) means for generating a first BG voltage potential;
- second BG means for generating a second BG voltage potential;
- and
- circuit means, that communicates with said first and second BG means and that includes a first mode and a second mode, for generating a mode signal based on said first mode and said second mode,
- wherein said first BG means turns off when said mode signal corresponds to said second mode.
2 more elements
A method for generating a band gap voltage reference, comprising:
- generating a first BG voltage potential using a first BG circuit;
- generating a second BG voltage potential using a second BG circuit that includes a variable resistance, wherein said second BG voltage potential is related to said variable resistance,
- adjusting said variable resistance based on a difference between said first BG voltage potential and said second BG voltage potential;
- and
- shutting down said first BG circuit when said second BG voltage potential is approximately equal to said first BG voltage potential.
2 more elements
A method for providing a band gap voltage reference, comprising:
- generating a first BG voltage potential using a first band gap (BG) circuit;
- generating a second BG voltage potential using a second BG circuit;
- and
- adjusting said second BG voltage potential based on said first BG voltage potential.
1 more element
A method for generating a band gap voltage reference, comprising:
- generating a first BG voltage potential using a first band gap (BG) circuit;
- generating a second BG voltage potential using a second BG circuit;
- providing a device having a first mode and a second mode;
- generating a mode signal using said device based on said first mode and said second mode;
- and
- turning off said first BG circuit when said mode signal corresponds to said second mode.
3 more elements
Dependencies are inferred from the claim text.